Molecular formula C
5H 4N 4O
Molar mass 136.112
Except where noted otherwise, data are given for materials in their
standard state (at 25 °C (77 °F), 100 kPa)
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Hypoxanthine is a naturally occurring purine derivative. It is occasionally found as a constituent of nucleic acids, where it is present in the anticodon of tRNA in the form of its nucleoside inosine. It has a tautomer known as 6-hydroxypurine. Hypoxanthine is a necessary additive in certain cell, bacteria, and parasite cultures as a substrate and nitrogen source. For example, it is commonly a required [1 ] reagent in malaria parasite cultures, since requires a source of hypoxanthine for nucleic acid synthesis and energy metabolism. Plasmodium falciparum
In August 2011, a report, based on
NASA studies with meteorites found on Earth, was published suggesting hypoxanthine and related organic molecules, including the DNA and RNA components adenine and guanine, may have been formed extraterrestrially in outer space. [2 ] [3 ] [4 ]
Pheretima aspergillum worm, used in Chinese medicine preparations, contains hypoxanthine. [5 ]
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It is one of the products of the action of
xanthine oxidase on xanthine. However, more frequently in purine degradation, xanthine is formed from reduction of hypoxanthine by xanthine oxidoreductase.
Hypoxanthine-guanine phosphoribosyltransferase converts hypoxanthine into IMP in nucleotide salvage.
Hypoxanthine is also a spontaneous
deamination product of adenine. Because of its resemblance to guanine, the spontaneous deamination of adenine can lead to an error in DNA transcription/replication.
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References [ edit ]
^ "3H-hypoxanthine uptake inhibition assay for drug susceptibility". WWARN . Retrieved . 2012-03-01
^ Callahan; Smith, K.E.; Cleaves, H.J.; Ruzica, J.; Stern, J.C.; Glavin, D.P.; House, C.H.; Dworkin, J.P. (11 August 2011). "Carbonaceous meteorites contain a wide range of extraterrestrial nucleobases". PNAS. doi: 10.1073/pnas.1106493108 . Retrieved . 2011-08-15
^ Steigerwald, John (8 August 2011). "NASA Researchers: DNA Building Blocks Can Be Made in Space". NASA . Retrieved . 2011-08-10
^ ScienceDaily Staff (9 August 2011). "DNA Building Blocks Can Be Made in Space, NASA Evidence Suggests". ScienceDaily . Retrieved . 2011-08-09
^ The Pharmacology of Chinese Herbs, Second Edition By Kee C. Huang
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