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|Section2= |Section3= }} 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,〔(【引用サイトリンク】url=http://www.wwarn.org/learning/procedures/INV07 )〕 it is commonly a required reagent in malaria parasite cultures, since ''Plasmodium falciparum'' requires a source of hypoxanthine for nucleic acid synthesis and energy metabolism. 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. The ''Pheretima aspergillum'' worm, used in Chinese medicine preparations, contains hypoxanthine.〔The Pharmacology of Chinese Herbs, Second Edition By Kee C. Huang〕 ==Reactions== 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hypoxanthine」の詳細全文を読む スポンサード リンク
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