微生物に学ぶビタミンB₁₂代謝のシステム酵素学

• 虎谷 哲夫

  岡山大学大学院自然科学研究科

書誌事項

タイトル別名

• Microbe-inspired System Enzymology of Vitamin B₁₂ Metabolism
• 微生物に学ぶビタミンB12代謝のシステム酵素学
• ビセイブツ ニ マナブ ビタミン B12 タイシャ ノ システム コウソガク

抄録

  Vitamin B₁₂ is produced only by prokaryotes and utilized by animals as an essential micronutrient. Genetic complementation analysis of cell lines from patients indicated that at least eight gene products are involved in intracellular B₁₂ metabolism and utilization. We have investigated bacterial adenosylcobalamin-dependent enzymes and elucidated their structure-based fine mechanisms. They tend to undergo mechanism-based inactivation during catalysis, because they use highly reactive radicals for catalyzing chemically difficult reactions. We have discovered molecular chaperone-like reactivating factors for these enzymes that release a damaged cofactor forming apoenzyme. Methylcobalamin-dependent methionine synthase also undergoes inactivation, because it utilizes cob(I)alamin, a super nucleophile, for catalysis. Methionine synthase reductase is a reactivating partner for this enzyme. Recent studies suggested that activity-maintaining systems for B₁₂ enzymes are present in animal cells as well, and thus hints for designing therapeutic agents for B₁₂-related metabolic disorders might be obtained from the investigations of microbial B₁₂ metabolism.<br>

収録刊行物

• 薬学雑誌

  薬学雑誌 130 (11), 1453-1462, 2010-11-01

  公益社団法人 日本薬学会

キーワード

• vitamin B₁₂
• B₁₂ metabolism
• B₁₂ enzyme
• inactivation
• reactivating factor

詳細情報

• CRID: 1390001206127544704
• NII論文ID: 130000451695
• NII書誌ID: AN00284903
• DOI: 10.1248/yakushi.130.1453
• ISSN: 13475231
• ISSN: 00316903
• NDL書誌ID: 10893698
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10893698
• Web Site: https://www.jstage.jst.go.jp/article/yakushi/130/11/130_11_1453/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2011149123
• 本文言語コード: ja
• データソース種別:
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  • NDL
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• 抄録ライセンスフラグ: 使用不可