6BLD

Mycobacterium marinum cytochrome P450 CYP268A2 in complex with pseudoionone

6BLD の概要

• エントリーDOI: 10.2210/pdb6bld/pdb
• 分子名称: Cytochrome P450 268A2 Cyp268A2, PROTOPORPHYRIN IX CONTAINING FE, (3E,5E)-6,10-dimethylundeca-3,5,9-trien-2-one, ... (4 entities in total)
• 機能のキーワード: cytochrome p450, monooxygenase, heme protein, oxidoreductase
• 由来する生物種: Mycobacterium marinum
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 46865.70

構造登録者

Child, S.A.,Bruning, J.B.,Bell, S.G. (登録日: 2017-11-09, 公開日: 2018-01-24, 最終更新日: 2023-10-04)

主引用文献

Child, S.A.,Naumann, E.F.,Bruning, J.B.,Bell, S.G.
Structural and functional characterisation of the cytochrome P450 enzyme CYP268A2 from
Biochem. J., 475:705-722, 2018

PubMed Abstract: Members of the cytochrome P450 monooxygenase family CYP268 are found across a broad range of species including the pathogens , , , and CYP268A2, from , which is the first member of this family to be studied, was purified and characterised. CYP268A2 was found to bind a variety of substrates with high affinity, including branched and straight chain fatty acids (C10-C12), acetate esters, and aromatic compounds. The enzyme was also found to bind phenylimidazole inhibitors but not larger azoles, such as ketoconazole. The monooxygenase activity of CYP268A2 was efficiently reconstituted using heterologous electron transfer partner proteins. CYP268A2 hydroxylated geranyl acetate and s-pseudoionone at a terminal methyl group to yield (,)-8-hydroxy-3,7-dimethylocta-2,6-dien-1-yl acetate and (,,)-11-hydroxy-6,10-dimethylundeca-3,5,9-trien-2-one, respectively. The X-ray crystal structure of CYP268A2 was solved to a resolution of 2.0 Å with -pseudoionone bound in the active site. The overall structure was similar to that of the related phytanic acid monooxygenase CYP124A1 enzyme from , which shares 41% sequence identity. The active site is predominantly hydrophobic, but includes the Ser99 and Gln209 residues which form hydrogen bonds with the terminal carbonyl group of the pseudoionone. The structure provided an explanation on why CYP268A2 shows a preference for shorter substrates over the longer chain fatty acids which bind to CYP124A1 and the selective nature of the catalysed monooxygenase activity.

PubMed: 29343612
DOI: 10.1042/BCJ20170946

実験手法

X-RAY DIFFRACTION (1.997 Å)