The enzyme 3,4-dihydroxy-2-butanone 4-phosphate synthase (RibB) EC 4.1.99.12 catalyses the conversion of D-ribulose 5-phosphate to formate and 3,4-dihydroxy-2-butanone 4-phosphate, the latter serving as the biosynthetic precursor for the xylene ring of riboflavin. In Photobacterium leiognathi, the riboflavin synthesis genes ribB, ribE, ribH and ribA all reside in the lux operon. RibB is sometimes found as a bifunctional enzyme with GTP cyclohydrolase II that catalyses the first committed step in the biosynthesis of riboflavin. No sequences with significant homology to DHBP synthase are found in the metazoa.
"}{"type":"standard","title":"Ihor Nakonechnyi","displaytitle":"Ihor Nakonechnyi","namespace":{"id":0,"text":""},"wikibase_item":"Q16679477","titles":{"canonical":"Ihor_Nakonechnyi","normalized":"Ihor Nakonechnyi","display":"Ihor Nakonechnyi"},"pageid":54619126,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/%D0%98%D0%B3%D0%BE%D1%80%D1%8C_%D0%9D%D0%B0%D0%BA%D0%BE%D0%BD%D0%B5%D1%87%D0%BD%D1%8B%D0%B9.jpg/330px-%D0%98%D0%B3%D0%BE%D1%80%D1%8C_%D0%9D%D0%B0%D0%BA%D0%BE%D0%BD%D0%B5%D1%87%D0%BD%D1%8B%D0%B9.jpg","width":320,"height":281},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/6/6f/%D0%98%D0%B3%D0%BE%D1%80%D1%8C_%D0%9D%D0%B0%D0%BA%D0%BE%D0%BD%D0%B5%D1%87%D0%BD%D1%8B%D0%B9.jpg","width":1192,"height":1048},"lang":"en","dir":"ltr","revision":"1279457305","tid":"6b02de1f-fc47-11ef-839d-73b61e9a2974","timestamp":"2025-03-08T18:01:54Z","description":"Ukrainian footballer and coach","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Ihor_Nakonechnyi","revisions":"https://en.wikipedia.org/wiki/Ihor_Nakonechnyi?action=history","edit":"https://en.wikipedia.org/wiki/Ihor_Nakonechnyi?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Ihor_Nakonechnyi"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Ihor_Nakonechnyi","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Ihor_Nakonechnyi","edit":"https://en.m.wikipedia.org/wiki/Ihor_Nakonechnyi?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Ihor_Nakonechnyi"}},"extract":"Ihor Anatoliyovych Nakonechnyi is a retired Ukrainian football player and coach. He played with different Soviet and Ukrainian clubs.","extract_html":"
Ihor Anatoliyovych Nakonechnyi is a retired Ukrainian football player and coach. He played with different Soviet and Ukrainian clubs.
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{"fact":"Many Egyptians worshipped the goddess Bast, who had a woman\u2019s body and a cat\u2019s head.","length":84}
{"fact":"Blue-eyed, pure white cats are frequently deaf.","length":47}
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