3e4e

Human cytochrome P450 2E1 in complex with the inhibitor 4-methylpyrazole

spinqualitylabelsall models 3e4e, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3e4e is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 4PZ, HEM Gene: CYP2E1, CYP2E (HUMAN) Activity: Unspecific monooxygenase, with EC number 1.14.14.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CP2E1_HUMAN] Metabolizes several precarcinogens, drugs, and solvents to reactive metabolites. Inactivates a number of drugs and xenobiotics and also bioactivates many xenobiotic substrates to their hepatotoxic or carcinogenic forms. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Human microsomal cytochrome P-450 2E1 (CYP2E1) monooxygenates > 70 low molecular weight xenobiotic compounds, as well as much larger endogenous fatty acid signaling molecules such as arachidonic acid. In the process, CYP2E1 can generate toxic or carcinogenic compounds, as occurs with acetaminophen overdose, nitrosamines in cigarette smoke, and reactive oxygen species from uncoupled catalysis. Thus, the diverse roles that CYP2E1 has in normal physiology, toxicity, and drug metabolism are related to its ability to metabolize diverse classes of ligands, but the structural basis for this was previously unknown. Structures of human CYP2E1 have been solved to 2.2 angstroms for an indazole complex and 2.6 angstroms for a 4-methylpyrazole complex. Both inhibitors bind to the heme iron and hydrogen bond to Thr303 within the active site. Complementing its small molecular weight substrates, the hydrophobic CYP2E1 active site is the smallest yet observed for a human cytochrome P-450. The CYP2E1 active site also has two adjacent voids: one enclosed above the I helix and the other forming a channel to the protein surface. Minor repositioning of the Phe478 aromatic ring that separates the active site and access channel would allow the carboxylate of fatty acid substrates to interact with conserved 216QXXNN220 residues in the access channel while positioning the hydrocarbon terminus in the active site, consistent with experimentally observed omega-1 hydroxylation of saturated fatty acids. Thus, these structures provide insights into the ability of CYP2E1 to effectively bind and metabolize both small molecule substrates and fatty acids. Structures of human cytochrome P-450 2E1. Insights into the binding of inhibitors and both small molecular weight and fatty acid substrates.,Porubsky PR, Meneely KM, Scott EE J Biol Chem. 2008 Nov 28;283(48):33698-707. Epub 2008 Sep 24. PMID:18818195 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome P450 Drug Metabolism by CYP450 Enzymes

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