Classification Term: 3748
Pentoses (ontology term: CHEMONTID:0001497)
Monosaccharides in which the carbohydrate moiety contains five carbon atoms." []
found 48 associated metabolites at family metabolite taxonomy ontology rank level.
Ancestor: Monosaccharides
Child Taxonomies: Pentose phosphates
Ribose 1-phosphate
Ribose 1-phosphate, also known as alpha-D-ribofuranose 1-phosphate or 1-O-phosphono-A-D-ribofuranose, is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Ribose 1-phosphate is soluble (in water) and a moderately acidic compound (based on its pKa). Ribose 1-phosphate can be found in a number of food items such as cassava, capers, pine nut, and wheat, which makes ribose 1-phosphate a potential biomarker for the consumption of these food products. Ribose 1-phosphate can be found primarily in cellular cytoplasm. Ribose 1-phosphate exists in all living species, ranging from bacteria to humans. In humans, ribose 1-phosphate is involved in several metabolic pathways, some of which include pyrimidine metabolism, nicotinate and nicotinamide metabolism, pentose phosphate pathway, and azathioprine action pathway. Ribose 1-phosphate is also involved in several metabolic disorders, some of which include beta ureidopropionase deficiency, gout or kelley-seegmiller syndrome, transaldolase deficiency, and UMP synthase deficiency (orotic aciduria). Ribose 1-phosphate is an intermediate in the metabolism of Pyrimidine and the metabolism of Nicotinate and nicotinamide. It is a substrate for Uridine phosphorylase 2, Phosphoglucomutase, Purine nucleoside phosphorylase and Uridine phosphorylase 1. Ribose 1-phosphate can be formed from guanosine through the action of purine nucleoside phosphorylase. Ribose 1-phosphate can also act as a ribose donor in the synthesis of xanthosine as catalyzed by the same enzyme (purine nucleoside phosphorylase). The presence of guanase, which irreversibly converts guanine to xanthine, affects the overall process of guanosine transformation. As a result of this purine pathway, guanosine is converted into xanthosine, thus overcoming the lack of guanosine deaminase in mammals. The activated ribose moiety in Ribose 1-phosphate which stems from the catabolism of purine nucleosides can be transferred to uracil and, in the presence of ATP, used for the synthesis of pyrimidine nucleotides; therefore, purine nucleosides can act as ribose donors for the salvage of pyrimidine bases. (PMID: 9133638). COVID info from COVID-19 Disease Map Corona-virus KEIO_ID R017 Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
D-Xylose
Xylose or wood sugar is an aldopentose - a monosaccharide containing five carbon atoms and an aldehyde functional group. It has chemical formula C5H10O5 and is 40\\\\% as sweet as sucrose. Xylose is found in the embryos of most edible plants. The polysaccharide xylan, which is closely associated with cellulose, consists practically entirely of d-xylose. Corncobs, cottonseed hulls, pecan shells, and straw contain considerable amounts of this sugar. Xylose is also found in mucopolysaccharides of connective tissue and sometimes in the urine. Xylose is the first sugar added to serine or threonine residues during proteoglycan type O-glycosylation. Therefore xylose is involved in the biosythetic pathways of most anionic polysaccharides such as heparan sulphate and chondroitin sulphate. In medicine, xylose is used to test for malabsorption by administering a xylose solution to the patient after fasting. If xylose is detected in the blood and/or urine within the next few hours, it has been absorbed by the intestines. Xylose is said to be one of eight sugars which are essential for human nutrition, the others being galactose, glucose, mannose, N-acetylglucosamine, N-acetylgalactosamine, fucose, and sialic acid. (Wikipedia). Xylose in the urine is a biomarker for the consumption of apples and other fruits. Xylose is a sugar first isolated from wood, and named for it. Xylose is classified as a monosaccharide of the aldopentose type, which means that it contains five carbon atoms and includes an aldehyde functional group. It is the precursor to hemicellulose, one of the main constituents of biomass. D-Xylopyranose is found in flaxseed. D-(+)-xylose (Xylose) is a natural compound that is catalyzed by xylose isomerase to form xylulose, which is a key step in the anaerobic ethanol fermentation of xylose. D-(+)-xylose (Xylose) is a natural compound that is catalyzed by xylose isomerase to form xylulose, which is a key step in the anaerobic ethanol fermentation of xylose.
D-Arabinose
D-Arabinose (CAS: 10323-20-3) belongs to the class of organic compounds known as pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Outside of the human body, D-arabinose has been detected, but not quantified in, sweet basils and tamarinds. This could make D-arabinose a potential biomarker for the consumption of these foods. Arabinose is an aldopentose – a monosaccharide containing five carbon atoms, and including an aldehyde (CHO) functional group. D-Arabinose is found in sweet basil and tamarind. D000074385 - Food Ingredients > D005503 - Food Additives > D010368 - Pectins Arabinose is an endogenous metabolite. Arabinose is an endogenous metabolite. DL-Xylose is an intermediate of organic synthesis. DL-Xylose is an intermediate of organic synthesis. L-(+)-Arabinose selectively inhibits intestinal sucrase activity in a noncompetitive manner and suppresses the plasma glucose increase due to sucrose ingestion. L-(+)-Arabinose selectively inhibits intestinal sucrase activity in a noncompetitive manner and suppresses the plasma glucose increase due to sucrose ingestion. D-(+)-xylose (Xylose) is a natural compound that is catalyzed by xylose isomerase to form xylulose, which is a key step in the anaerobic ethanol fermentation of xylose. D-(+)-xylose (Xylose) is a natural compound that is catalyzed by xylose isomerase to form xylulose, which is a key step in the anaerobic ethanol fermentation of xylose.
D-Arabinono-1,4-lactone
D-arabinono-1,4-lactone, also known as D-arabinonic acid, gamma-lactone, is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. D-arabinono-1,4-lactone is soluble (in water) and a very weakly acidic compound (based on its pKa). D-arabinono-1,4-lactone can be found in rice, which makes D-arabinono-1,4-lactone a potential biomarker for the consumption of this food product. D-arabinono-1,4-lactone may be a unique S.cerevisiae (yeast) metabolite.
Deoxyribose 1-phosphate
Deoxyribose 1-phosphate is an intermediate in the metabolism of Pyrimidine. It is a substrate for Purine nucleoside phosphorylase and Thymidine phosphorylase. [HMDB] Deoxyribose 1-phosphate is an intermediate in the metabolism of Pyrimidine. It is a substrate for Purine nucleoside phosphorylase and Thymidine phosphorylase. COVID info from COVID-19 Disease Map KEIO_ID D013 Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
Erythrose
Erythrose is a tetrose saccharide with the chemical formula C4H8O4. It has one aldehyde group, and is thus part of the aldose family. The natural isomer is D-erythrose. It is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Erythrose is very soluble (in water). Erythrose can be found in blood, as well as in human cartilage tissue. Within the cell, erythrose is primarily located in the cytoplasm (predicted from logP). Erythrose exists in all living organisms, ranging from bacteria to humans. Erythrose is found to be associated with schizophrenia. Erythrose was first isolated in 1849 from rhubarb by the French pharmacist Louis Feux Joseph Garot (1798-1869) and was named as such because of its red hue in the presence of alkali metals. D-erythrose is a tetrose carbohydrate with chemical formula C4H8O4. It has one aldehyde group and so is part of the aldose family. It is a syrupy liquid at room temperature. [HMDB] Acquisition and generation of the data is financially supported in part by CREST/JST.
D-Ribose
D-Ribose, commonly referred to as simply ribose, is a five-carbon sugar found in all living cells. Ribose is not an essential nutrient because it can be synthesized by almost every tissue in the body from other substances, such as glucose. It is vital for life as a component of DNA, RNA, ATP, ADP, and AMP. In nature, small amounts of ribose can be found in ripe fruits and vegetables. Brewers yeast, which has a high concentration of RNA, is another rich source of ribose. D-ribose is also a component of many so-called energy drinks and anti-ageing products available on the market today. Ribose is a structural component of ATP, which is the primary energy source for exercising muscle. The adenosine component is an adenine base attached to the five-carbon sugar ribose. ATP provides energy to working muscles by releasing a phosphate group, hence becoming ADP, which in turn may release a phosphate group, then becoming AMP. During intense muscular activity, the total amount of ATP available is quickly depleted. In an effort to correct this imbalance, AMP is broken down in the muscle and secreted from the cell. Once the breakdown products of AMP are released from the cell, the energy potential (TAN pool) of the muscle is reduced and ATP must then be reformed using ribose. Ribose helps restore the level of adenine nucleotides by bypassing the rate-limiting step in the de novo (oxidative pentose phosphate) pathway, which regenerates phosphoribosyl pyrophosphate (PRPP), the essential precursor for ATP. If ribose is not readily available to a cell, glucose may be converted to ribose. Ribose supplementation has been shown to increase the rate of ATP resynthesis following intense exercise. The use of ribose in men with severe coronary artery disease resulted in improved exercise tolerance. Hence, there is interest in the potential of ribose supplements to boost muscular performance in athletic activities (PMID: 17618002, Curr Sports Med Rep. 2007 Jul;6(4):254-7.). Ribose, also known as D-ribose or alpha-delta-ribose-5, is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Ribose is very soluble (in water) and a very weakly acidic compound (based on its pKa). Ribose can be found in a number of food items such as lemon verbena, devilfish, watercress, and chicory roots, which makes ribose a potential biomarker for the consumption of these food products. Ribose can be found primarily in most biofluids, including urine, cerebrospinal fluid (CSF), saliva, and feces, as well as throughout most human tissues. Ribose exists in all living species, ranging from bacteria to humans. In humans, ribose is involved in the pentose phosphate pathway. Ribose is also involved in few metabolic disorders, which include glucose-6-phosphate dehydrogenase deficiency, ribose-5-phosphate isomerase deficiency, and transaldolase deficiency. Moreover, ribose is found to be associated with ribose-5-phosphate isomerase deficiency. The ribose β-D-ribofuranose forms part of the backbone of RNA. It is related to deoxyribose, which is found in DNA. Phosphorylated derivatives of ribose such as ATP and NADH play central roles in metabolism. cAMP and cGMP, formed from ATP and GTP, serve as secondary messengers in some signalling pathways . D-Ribose(mixture of isomers) is an energy enhancer, and acts as a sugar moiety of ATP, and widely used as a metabolic therapy supplement for chronic fatigue syndrome or cardiac energy metabolism. D-Ribose(mixture of isomers) is active in protein glycation, induces NF-κB inflammation in a RAGE-dependent manner[1]. D-Ribose(mixture of isomers) is an energy enhancer, and acts as a sugar moiety of ATP, and widely used as a metabolic therapy supplement for chronic fatigue syndrome or cardiac energy metabolism. D-Ribose(mixture of isomers) is active in protein glycation, induces NF-κB inflammation in a RAGE-dependent manner[1]. D-Ribose(mixture of isomers) is an energy enhancer, and acts as a sugar moiety of ATP, and widely used as a metabolic therapy supplement for chronic fatigue syndrome or cardiac energy metabolism. D-Ribose(mixture of isomers) is active in protein glycation, induces NF-κB inflammation in a RAGE-dependent manner[1].
D-Ribulose
D-Ribulose (CAS: 488-84-6) is a ketopentose - a monosaccharide containing five carbon atoms, including a ketone functional group. D-Ribulose is an intermediate in the fungal pathway for D-arabitol production. As the 1,5-bisphosphate, it combines with CO2 at the start of the photosynthetic process in green plants (carbon dioxide trap). D-Ribulose is the epimer of D-xylulose (Wikipedia). Ribulose is also a microbial metabolite found in Acetobacter and Gluconobacter (PMID: 16232643, 11272814). Ribulose is a ketopentose - a monosaccharide containing five carbon atoms, and including a ketone functional group. D-ribulose is an intermediate in the fungal pathway for D-arabitol production. As the 1,5-bisphosphate, it combines with CO2 at the start of the photosynthetic process in green plants (carbon dioxide trap); d-ribulose is the epimer of d-xylulose. D-Ribulose is found in red beetroot.
Deoxyribose
Deoxyribose is an aldopentose, a monosaccharide containing five carbon atoms, and including an aldehyde functional group. It is derived from the pentose sugar ribose by the replacement of the hydroxyl group at the 2 position with hydrogen, leading to the net loss of an oxygen atom, and has chemical formula C5H10O4. In deoxyribose, the carbon furthest from the attached carbon is stripped of the oxygen atom in what would be a hydroxyl group in ribose. The common base adenine (a purine derivative) coupled to deoxyribose is called deoxyadenosine. The 5-triphosphate derivative of adenosine, commonly called adenosine triphosphate (ATP) is an important energy transport molecule in cells. -- Wikipedia [HMDB] Deoxyribose is an aldopentose, a monosaccharide containing five carbon atoms, and including an aldehyde functional group. It is derived from the pentose sugar ribose by the replacement of the hydroxyl group at the 2 position with hydrogen, leading to the net loss of an oxygen atom, and has chemical formula C5H10O4. In deoxyribose, the carbon furthest from the attached carbon is stripped of the oxygen atom in what would be a hydroxyl group in ribose. The common base adenine (a purine derivative) coupled to deoxyribose is called deoxyadenosine. The 5-triphosphate derivative of adenosine, commonly called adenosine triphosphate (ATP) is an important energy transport molecule in cells. -- Wikipedia. COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS Thyminose is an endogenous metabolite. Thyminose is an endogenous metabolite.
L-Rhamnulose
L-Rhamnulose (CAS: 14807-05-7), also known as 6-deoxy-L-fructose, is a breakdown product of L-rhamnose, which is ubiquitous and particularly abundant in some plants, such as buckthorn. Rhamnose is also one of the sugars regularly used to conduct the dual sugar permeability test. Rhamnose is fermented by some colonic bacteria into L-rhamnulose. Three bacterial (gut microflora) enzymes are involved in rhamnose degradation including rhaB (rhamnulose kinase), rhaA (rhamnose isomerase), and rhaD (rhamnulose-1-phosphate aldolase). L-Rhamnulose kinase catalyzes the transfer of the gamma-phosphate group from ATP to the 1-hydroxyl group of L-rhamnulose. L-Rhamnulose has been found in Escherichia (PMID: 4975916). L-Rhamnulose is a breakdown product of L-rhamnose, which is ubiquitous and particularly abundant in some plants, such as buckthorn. Rhamnose is also one of the sugars regularly used to conduct the dual sugar permeability test. Rhamnose is fermented by some colonic bacteria into L-rhamnulose. Three bacterial (gut micrflora) enzymes are involved in Rhamnose degradation including rhaB (rhamulose kinase), rhaA (rhamnose isomerase), and rhaD (rhamnulose-1-phosphate aldolase). L-rhamnulose kinase catalyzes the transfer of the gamma-phosphate group from ATP to the 1-hydroxyl group of L-rhamnulose. [HMDB]
D-Apiose
Beta-d-apiofuranose is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Beta-d-apiofuranose is very soluble (in water) and a very weakly acidic compound (based on its pKa). Beta-d-apiofuranose can be found in parsley, which makes beta-d-apiofuranose a potential biomarker for the consumption of this food product.
D-Apiose is found in green vegetables. D-Apiose is first found in parsley as the glycoside Apiin
L-rhamnofuranose
L-rhamnofuranose is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. L-rhamnofuranose is soluble (in water) and a very weakly acidic compound (based on its pKa). L-rhamnofuranose can be found in a number of food items such as guava, babassu palm, wild celery, and red beetroot, which makes L-rhamnofuranose a potential biomarker for the consumption of these food products.
5-Methylthioribose
5-Methylthioribose (CAS: 23656-67-9) belongs to the class of organic compounds known as pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms. 5-Methylthioribose is an extremely weak basic (essentially neutral) compound (based on its pKa). 5-Methylthioribose exists in all living organisms, ranging from bacteria to humans. In humans, 5-methylthioribose is involved in the metabolic disorder called hypermethioninemia. Outside of the human body, 5-methylthioribose has been detected, but not quantified in, several different foods, such as alaska wild rhubarbs, common verbena, greenthread tea, pasta, and Irish moss. This could make 5-methylthioribose a potential biomarker for the consumption of these foods. 5-Methylthioribose is a metabolite of 5-methylthioribose-1-phosphate. It is a substrate of methylthioribose kinase (EC 2.7.1.100) in the methionine metabolism pathway (KEGG). It can be found in Escherichia (PMID: 4203512). 5-Methylthioribose is a metabolite of 5-methylthioribose-1-phosphate. It is a substrate of methylthioribose kinase [EC 2.7.1.100] in the methionine metabolism pathway (KEGG). [HMDB]. 5-Methylthioribose is found in many foods, some of which are persian lime, wild rice, brussel sprouts, and cabbage.
5-Methylthioribose 1-phosphate
5-Methylthioribose 1-phosphate belongs to the class of organic compounds known as pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms. 5-Methylthioribose 1-phosphate is an intermediate in methionine biosynthesis. It is converted from 5-deoxy-5-methylthioadenosine by 5-deoxy-5-methylthioadenosine phosphorylase. Then it is converted to methionine (PMID: 2153115). In the methionine salvage pathway, 5-methylthioribose 1-phosphate isomerase (M1Pi) catalyzes the conversion of 5-methylthioribose 1-phosphate (MTR-1-P) into 5-methylthioribulose 1-phosphate (MTRu-1-P). 5-Methylthioribose 1-phosphate is an intermediate in methionine biosynthesis. It is converted from 5-Deoxy-5-methylthioadenosine by 5-Deoxy-5-methylthioadenosine phosphorylase. Then it is converted to methionine (PMID 2153115). In the methionine salvage pathway 5-methylthioribose 1-phosphate isomerase (M1Pi) catalyzes the conversion of 5-methylthioribose 1-phosphate (MTR-1-P) to 5-methylthioribulose 1-phosphate (MTRu-1-P) [HMDB]
5-Amino-6-ribitylamino uracil
5-Amino-6-ribitylamino uracil is an intermediate in riboflavin metabolism. It is converted from 5-amino-6-(5-phosphoribitylamino)uracil via dephosphorylation by the enzyme phosphohistidine phosphatase 1 (EC 3.1.3.-). It is considered to be the second product of the riboflavin synthase reaction (PMID: 14245407). Humans do not have all the enzymes needed to synthesize or metabolize riboflavin. However, gut microflora do have the necessary enzymatic machinery to produce and metabolize this vitamin. Riboflavin (or vitamin B2) is an easily absorbed micronutrient with a key role in maintaining health in humans and animals. It is the central component of the cofactors FAD and FMN, and is therefore required by all flavoproteins. Riboflavin is yellow or yellow-orange in colour and in addition to being used as a food colouring it is also used to fortify some foods including baby foods, breakfast cereals, pastas, sauces, processed cheese, fruit drinks, vitamin-enriched milk products, some energy drinks, and vitamin supplements. 5-amino-6-(d-ribitylamino)uracil, also known as 5-amino-6-ribitylamino-2,4-(1h,3h)pyrimidinedione or 5-arpd, is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. 5-amino-6-(d-ribitylamino)uracil is soluble (in water) and a very weakly acidic compound (based on its pKa). 5-amino-6-(d-ribitylamino)uracil can be found in a number of food items such as radish (variety), chinese cabbage, common beet, and spinach, which makes 5-amino-6-(d-ribitylamino)uracil a potential biomarker for the consumption of these food products. 5-amino-6-(d-ribitylamino)uracil exists in E.coli (prokaryote) and yeast (eukaryote).
1-Deoxy-D-xylulose
1-Deoxy-D-xylulose is a product of the splitting up of Pyridoxine (an intermediate in Vitamin B6 metabolism) into two components (the other one being 4-Hydroxy-L-threonine). (KEGG) [HMDB] 1-Deoxy-D-xylulose is a product of the splitting up of Pyridoxine (an intermediate in Vitamin B6 metabolism) into two components (the other one being 4-Hydroxy-L-threonine). (KEGG).
2-Hydroxyphytanoyl-CoA
2-Hydroxyphytanoyl-CoA is a substrate for Phytanoyl-CoA dioxygenase (peroxisomal). [HMDB] 2-Hydroxyphytanoyl-CoA is a substrate for Phytanoyl-CoA dioxygenase (peroxisomal).
(2S,4R,5S)-Muscarine
D018373 - Peripheral Nervous System Agents > D001337 - Autonomic Agents > D010277 - Parasympathomimetics D018377 - Neurotransmitter Agents > D018678 - Cholinergic Agents > D018679 - Cholinergic Agonists Main toxic constituent of the fly fungus Amanita muscaria and various Inocybe specie
5-Deoxyribose-1-phosphate
This compound belongs to the family of Pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms
L-Arabinose
L-Arabinose (CAS: 5328-37-0) belongs to the class of compounds known as aldopentoses. An aldopentose is a monosaccharide containing five carbon atoms, including an aldehyde (CHO) functional group. Arabinose gets its name from gum arabic, from which it was first isolate. Most saccharides found in nature are in the "D"-form, however, L-arabinose is in fact more common than D-arabinose. L-arabinose is found in nature as a component of biopolymers such as hemicellulose and pectin. L-arabinose is found in all organisms from bacteria to plants to animals. Arabinose is the second most abundant pentose in lignocellulosic biomass after xylose. There are two different arabinose utilization pathways in nature: bacterial and fungal. The bacterial pathway converts arabinose into xylulose-5-P via ribulose-5-P using three enzymes (L-arabinose isomerase, L-ribulokinase, and L-ribulose-5-P 4-epimerase) after which it enters the pentose phosphate pathway for ethanol production. The fungal pathway converts arabinose into L-arabinitol by aldose reductase (AR) or XR, L-xylulose by L-arabinitol 4-dehydrogenase (LAD), xylitol by L-xylulose reductase (LXR), D-xylulose by xylulose dehydrogenase (XDH), and D-xylulose-5-P by xylulose kinase (XK), and lastly enters the nonoxidative pentose phosphate pathway for further metabolism. Arabinose has a sweet taste and is one of the most abundant components released by complete hydrolysis of non-starch polysaccharides (NSP) of vegetable origin. Although widely present in nature, L-arabinose is rarely used in food production or food flavoring, and its physiological effects in vivo have received little attention. L-arabinose is known to selectively inhibit intestinal sucrase activity in a non-competitive manner. Sucrase is the enzyme that breaks down sucrose into glucose and fructose in the small intestine. As a result, L-arabinose suppresses plasma glucose increase due to sucrose ingestion. The presence of arabinose in urine may indicate overgrowth of intestinal yeast such as Candida albicans or other yeast/fungus species. L-arabinose is also a microbial metabolite found in, and produced by, Mycobacterium (PMID: 16232643). In a rare case of two autistic brothers that were not associated with any known metabolic disease, it was found the median value for L-arabinose in their urine samples was 179 umol/mmol creatinine, nearly six times greater than normal children (PMID: 11238761, 8931641, 1390604, 7628083). COVID info from clinicaltrial, clinicaltrials, clinical trial, clinical trials Flavouring agent Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
L-Xylulose
L-Xylulose (CAS: 527-50-4), also known as L-threo-2-pentulose, is a ketopentose - a monosaccharide containing five carbon atoms, including a ketone functional group. It has the chemical formula C5H10O5. L-Xylulose accumulates in the urine of pentosuria patients. Since L-xylulose is a reducing sugar like D-glucose, pentosuria patients have been wrongly diagnosed in the past to be diabetic.
D-Xylulose
D-xylulose is a monosaccharide containing five carbon atoms. D-xylulose is converted from xylitol by the enzyme NAD+-linked xylitol dehydrogenase (EC 1.1.1.9) in the glucuronate pathway, the most important xylitol-handling metabolic pathway in mammals. This activity has been described in human erythrocytes. Most likely, D-xylulose (as well as D-arabinose or D-ribulose) is a precursor of the pentiol D-arabitol, since pentitols are derived from their corresponding pentose phosphate precursors via pentoses. This pathway can play a role in inherited metabolic disorders underlying the accumulation of pentitols e.g., ribose 5-phosphate isomerase deficiency and transaldolase deficiency. Although pentitols are present in all living organisms, knowledge concerning their metabolism is limited. (PMID: 15234337, Mol Genet Metabolite 2004 Jul;82(3):231-7.) [HMDB]. D-Xylulose is found in many foods, some of which are garden onion, american cranberry, cucumber, and radish. D-Xylulose (CAS: 551-84-8) is a monosaccharide containing five carbon atoms. D-Xylulose is converted from xylitol by the enzyme NAD+-linked xylitol dehydrogenase (EC 1.1.1.9) in the glucuronate pathway, the most important xylitol-handling metabolic pathway in mammals. This activity has been described in human erythrocytes. Most likely, D-xylulose (as well as D-arabinose or D-ribulose) is a precursor of the pentiol D-arabitol, since pentitols are derived from their corresponding pentose phosphate precursors via pentoses. This pathway can play a role in inherited metabolic disorders underlying the accumulation of pentitols (e.g. ribose 5-phosphate isomerase deficiency and transaldolase deficiency). Although pentitols are present in all living organisms, knowledge concerning their metabolism is limited (PMID:15234337, Mol Genet Metab. 2004 Jul;82(3):231-7.).
L-Ribulose
Ribulose is a ketopentose- a monosaccharide containing five carbon atoms, and including a ketone functional group. It has chemical formula C5H10O5. Two diastereomers are possible, D-ribulose (D-erythro-pentulose) and L-ribulose (L-erythro-pentulose). D-ribulose is an intermediate in the fungal pathway for D-arabitol production. [HMDB] L-Ribulose (CAS: 2042-27-5) is a ketopentose - a monosaccharide containing five carbon atoms, including a ketone functional group. It has the chemical formula C5H10O5.
Arabinofuranose
Arabinofuranose refers to the furanose form of arabinose, which is an optical isomer of arabinose. For biosynthetic reasons, most saccharides are almost always more abundant in nature as the "D" form, or structurally analogous to D-(+)-glyceraldehyde. However, L-arabinose is in fact more common than D-arabinose in nature and is found in nature as a component of biopolymers such as hemicellulose and pectin. [HMDB] Arabinofuranose refers to the furanose form of arabinose, which is an optical isomer of arabinose. For biosynthetic reasons, most saccharides are almost always more abundant in nature as the "D" form, or structurally analogous to D-(+)-glyceraldehyde. However, L-arabinose is in fact more common than D-arabinose in nature and is found in nature as a component of biopolymers such as hemicellulose and pectin.
Ribonolactone
Ribonolactone, also known as D-ribono-1,4-lactone is a five-membered form of ribonolactone having D-configuration. It has a role as a metabolite. It is a ribonolactone and a butan-4-olide. It derives from a D-ribonic acid. Ribonolactone belongs to the class of organic compounds known as pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Ribonolactone is a metabolite normally not detectable in human biofluids; however, it has been found in the urine of patients with neuroblastoma. Ribonolactone is a metabolite normally not detectable in human biofluids; however, it has been found in the urine of patients with neuroblastoma. (PMID 699273) [HMDB] D-Ribonolactone is sugar lactone and an inhibitor of β-galactosidase of Escherichia coli with a Ki of 26 mM[1].
2-O-Methyl-D-xylose
2-O-Methyl-D-xylose is found in fruits. 2-O-Methyl-D-xylose is isolated from hydrolysis of Prunus domestica (plum) polysaccharides. Isolated from hydrolysis of Prunus domestica (plum) polysaccharides. 2-O-Methyl-D-xylose is found in fruits.
Ribose-1-arsenate
Ribose-1-arsenate is an intermediate in arsenate detoxification I pathway. Arsenic detoxification in most mammals involves alternative steps of reduction and oxidative methylation. The end metabolites are methylarsonate,cacodylate, and dimethylarsinous acid,which are less reactive than arsenate and arsenite, and are excreted in the urine.The pathway starts with the reduction of arsenate to arsenite. In this process,arsenate can be conjugate to ribose by the enzyme purine nucleoside phosphorylase (PNP), which accepts arsenate as an alternative substrate to its normal substrate, phosphate. The ribose-1-arsenate thus formed is converted to arsenite in the presence of dihydrolipoate, in a process that has not been fully characterized yet. [HMDB]. Ribose-1-arsenate is found in many foods, some of which are japanese walnut, yam, black-eyed pea, and lovage. Ribose-1-arsenate is an intermediate in arsenate detoxification I pathway. Arsenic detoxification in most mammals involves alternative steps of reduction and oxidative methylation. The end metabolites are methylarsonate,cacodylate, and dimethylarsinous acid,which are less reactive than arsenate and arsenite, and are excreted in the urine.The pathway starts with the reduction of arsenate to arsenite. In this process,arsenate can be conjugate to ribose by the enzyme purine nucleoside phosphorylase (PNP), which accepts arsenate as an alternative substrate to its normal substrate, phosphate. The ribose-1-arsenate thus formed is converted to arsenite in the presence of dihydrolipoate, in a process that has not been fully characterized yet.
D-1-Deoxy-erythro-hexo-2,3-diulose
Postulated common intermediate in the formation of sugar-amine products in food browning and related reactions
(2R,3R,4R)-2,3,4,5-Tetrahydroxypentanal
A pentose is a monosaccharide with five carbon atoms. Pentoses are organized into two groups. Aldopentoses have an aldehyde functional group at position 1. Ketopentoses have a ketone functional group in position 2 or 3. Pentoses is found in flaxseed and cocoa bean.
2-beta-d-Ribofuranosyl thiazole-4-carboxamide
5,6-Dihydro-5'-azacytidine
4-Amino-1-[(2R,3S,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]oxypyrimidin-2-one
5-Amino-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]oxyimidazole-4-carboxamide
(3R,4R,5R)-3-Fluoro-5-(hydroxymethyl)oxolane-2,3,4-triol
[(3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)oxolan-2-yl] [hydroxy(phosphonooxy)phosphoryl] hydrogen phosphate
1-[(2R,3R,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)oxolan-2-yl]oxypyrimidin-2-one
6-[(2R,4S,5R)-4-Hydroxy-5-(hydroxymethyl)oxolan-2-yl]-7,8-dihydroimidazo[1,2-c]pyrimidin-5-one
2-O-Methylxylose
2-o-methylxylose is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. 2-o-methylxylose is soluble (in water) and a very weakly acidic compound (based on its pKa). 2-o-methylxylose can be found in date, which makes 2-o-methylxylose a potential biomarker for the consumption of this food product.
alpha-L-arabinofuranose
Alpha-l-arabinose is a member of the class of compounds known as pentoses. Pentoses are monosaccharides in which the carbohydrate moiety contains five carbon atoms. Alpha-l-arabinose is very soluble (in water) and a very weakly acidic compound (based on its pKa). Alpha-l-arabinose can be found in a number of food items such as cloudberry, amaranth, red beetroot, and white mustard, which makes alpha-l-arabinose a potential biomarker for the consumption of these food products.
