4i91

Crystal Structure of Cytochrome P450 2B6 (Y226H/K262R) in complex with alpha-Pinene.

spinqualitylabelsall models 4i91, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4i91 is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: CM5, FRU, HEM, TMH Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CP2B6_HUMAN Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,4-cineole 2-exo-monooxygenase. Publication Abstract from PubMed Despite recent advances in atomic-level understanding of drug and inhibitor interactions with human cytochromes P450, the decades-old questions of chemical and structural determinants of hydrocarbon binding are still unanswered. (+)-alpha-Pinene is a monoterpene hydrocarbon that is widely distributed in the environment and a potent P450 2B inhibitor. Therefore, a combined biophysical and structural analysis of human P450 2B6 interactions with (+)-alpha-pinene was undertaken to elucidate the basis of the very high affinity binding. Binding of (+)-alpha-pinene to the P450 active site was demonstrated by a Type I spectral shift. Thermodynamics of ligand binding were explored using isothermal titration calorimetry and compared to those of P450 2A6, which is much less flexible than 2B6 based on comparison of multiple X-ray crystal structures. Consistent with expectation, entropy is the major driving force for hydrocarbon binding to P450 2A6, as evidenced by the calorimetric results. However, formation of the 2B6-(+)-alpha-pinene complex has a significant enthalpic component. A 2.0 A resolution crystal structure of this enzyme-ligand complex reveals that the highly plastic 2B6 utilizes previously unrecognized rearrangements of protein motifs. The results indicate that the specific components of enthalpic contribution to ligand binding are closely tied to the degree of enzyme flexibility. Structural and Thermodynamic Basis of (+)-alpha-Pinene Binding to Human Cytochrome P450 2B6.,Wilderman PR, Shah MB, Jang HH, Stout CD, Halpert JR J Am Chem Soc. 2013 Jul 17;135(28):10433-40. doi: 10.1021/ja403042k. Epub 2013, Jul 3. PMID:23786449 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome P450 3D structures

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