Crystal Structure of PigA: A Prolyl Thioester-Oxidizing Enzyme in Prodigiosin Biosynthesis

Cheng Chung Lee, Tzu Ping Ko, Chun Ting Chen, Yueh Te Chan, Shin Yi Lo, Jen Yu Chang, Ya Wen Chen, Ting Fang Chung, Hsin Ju Hsieh, Chwan Deng Hsiao, Andrew H.J. Wang

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4 引文 斯高帕斯(Scopus)

摘要

Prodigiosin is an intensely red pigment comprising three pyrroles. The biosynthetic pathway includes a two-step proline oxidation catalyzed by phosphatidylinositol N-acetylglucosaminyltransferase subunit A (PigA), with flavin adenine dinucleotide (FAD) as its cofactor. The enzyme is crystallized in the apo form and in complex with FAD and proline. As an acyl coenzyme A dehydrogenase (ACAD) family member, the protein folds into a β-sheet flanked by two α-helical domains. PigA forms a tetramer, which is consistent with analytical ultracentrifugation results. FAD binds to PigA in a similar way to that in the other enzymes of the ACAD family. The variable conformations of loop β4–β5 and helix αG correlate well with the structural flexibility required for substrate entrance to the Re side of FAD. Modeling with PigG, the acyl carrier protein, suggests a reasonable mode of interaction with PigA. The structure helps to explain the proline oxidation mechanism, in which Glu244 plays a central role by abstracting the substrate protons. It also reveals a plausible pocket for oxygen binding to the Si side of FAD.
原文英語
頁(從 - 到)193-202
頁數10
期刊ChemBioChem
20
發行號2
DOIs
出版狀態已發佈 - 1月 18 2019
對外發佈

ASJC Scopus subject areas

  • 生物化學
  • 分子醫學
  • 分子生物學
  • 有機化學

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