2XVI
Crystal structure of the mutant bacterial flavin containing monooxygenase (Y207S)
Summary for 2XVI
| Entry DOI | 10.2210/pdb2xvi/pdb |
| Related | 2VQ7 2VQB 2XLP 2XLR 2XLS 2XLT 2XLU |
| Descriptor | FLAVIN-CONTAINING MONOOXYGENASE, FLAVIN-ADENINE DINUCLEOTIDE, NITRATE ION, ... (6 entities in total) |
| Functional Keywords | oxidoreductase |
| Biological source | METHYLOPHAGA AMINISULFIDIVORANS |
| Total number of polymer chains | 3 |
| Total formula weight | 165174.38 |
| Authors | Cho, H.J.,Kang, B.S. (deposition date: 2010-10-26, release date: 2011-05-04, Last modification date: 2024-05-08) |
| Primary citation | Cho, H.J.,Cho, H.Y.,Kim, K.J.,Kim, M.H.,Kim, S.W.,Kang, B.S. Structural and Functional Analysis of Bacterial Flavin-Containing Monooxygenase Reveals its Ping-Pong-Type Reaction Mechanism. J.Struct.Biol., 175:39-, 2011 Cited by PubMed Abstract: A bacterial flavin-containing monooxygenase (bFMO) catalyses the oxygenation of indole to produce indigoid compounds. In the reductive half of the indole oxygenation reaction, NADPH acts as a reducing agent, and NADP(+) remains at the active site, protecting bFMO from reoxidation. Here, the crystal structures of bFMO and bFMO in complex with NADP(+), and a mutant bFMO(Y207S), which lacks indole oxygenation activity, with and without indole are reported. The crystal structures revealed overlapping binding sites for NADP(+) and indole, suggestive of a double-displacement reaction mechanism for bFMO. In biochemical assays, indole inhibited NADPH oxidase activity, and NADPH in turn inhibited the binding of indole and decreased indoxyl production. Comparison of the structures of bFMO with and without bound NADP(+) revealed that NADPH induces conformational changes in two active site motifs. One of the motifs contained Arg-229, which participates in interactions with the phosphate group of NADPH and appears be a determinant of the preferential binding of bFMO to NADPH rather than NADH. The second motif contained Tyr-207. The mutant bFMO(Y207S) exhibited very little indoxyl producing activity; however, the NADPH oxidase activity of the mutant was higher than the wild-type enzyme. It suggests a role for Y207, in the protection of hydroperoxyFAD. We describe an indole oxygenation reaction mechanism for bFMO that involves a ping-pong-like interaction of NADPH and indole. PubMed: 21527346DOI: 10.1016/J.JSB.2011.04.007 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.48 Å) |
Structure validation
Download full validation report
