6foq

The crystal structure of EncM complexed with dioxygen under 15 bar of oxygen pressure.

spinqualitylabelsall models 6foq, resolution 1.39Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6foq is a 4 chain structure with sequence from 'streptomyces maritimus'. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FAD, OXY Gene: encM ('Streptomyces maritimus') Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The reactions of enzymes and cofactors with gaseous molecules such as dioxygen (O2) are challenging to study and remain among the most contentious subjects in biochemistry. To date, it is largely enigmatic how enzymes control and fine-tune their reactions with O2, as exemplified by the ubiquitous flavin-dependent enzymes that commonly facilitate redox chemistry such as the oxygenation of organic substrates. Here we employ O2-pressurized X-ray crystallography and quantum mechanical calculations to reveal how the precise positioning of O2 within a flavoenzyme's active site enables the regiospecific formation of a covalent flavin-oxygen adduct and oxygenating species (i.e., the flavin-N5-oxide) by mimicking a critical transition state. This study unambiguously demonstrates how enzymes may control the O2 functionalization of an organic cofactor as prerequisite for oxidative catalysis. Our work thus illustrates how O2 reactivity can be harnessed in an enzymatic environment and provides crucial knowledge for future rational design of O2-reactive enzymes. Enzymatic control of dioxygen binding and functionalization of the flavin cofactor.,Saleem-Batcha R, Stull F, Sanders JN, Moore BS, Palfey BA, Houk KN, Teufel R Proc Natl Acad Sci U S A. 2018 Apr 23. pii: 1801189115. doi:, 10.1073/pnas.1801189115. PMID:29686059 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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