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4i4h

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{{STRUCTURE_4i4h| PDB=4i4h | SCENE= }}
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==Crystal structure of CYP3A4 ligated to pyridine-substituted desoxyritonavir==
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===Crystal structure of CYP3A4 ligated to pyridine-substituted desoxyritonavir===
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<StructureSection load='4i4h' size='340' side='right' caption='[[4i4h]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
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{{ABSTRACT_PUBMED_23586711}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[4i4h]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I4H OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4I4H FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=Z9Z:PYRIDIN-3-YLMETHYL+[(2R,5S)-5-{[N-(METHYL{[2-(PROPAN-2-YL)-1,3-THIAZOL-4-YL]METHYL}CARBAMOYL)-D-VALYL]AMINO}-1,6-DIPHENYLHEXAN-2-YL]CARBAMATE'>Z9Z</scene></td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3nxu|3nxu]], [[4i4g|4i4g]]</td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CYP3A4, CYP3A3 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4i4h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4i4h OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4i4h RCSB], [http://www.ebi.ac.uk/pdbsum/4i4h PDBsum]</span></td></tr>
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</table>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Utilization of the cytochrome P450 3A4 (CYP3A4) inhibitor ritonavir as a pharmacoenhancer for anti-HIV drugs revolutionized the treatment of HIV infection. However, owing to ritonavir-related complications, there is a need for development of new CYP3A4 inhibitors with improved pharmacochemical properties, which requires a full understanding of the CYP3A4 inactivation mechanisms and the unraveling of possible inhibitor binding modes. We investigated the mechanism of CYP3A4 interaction with three desoxyritonavir analogues, containing the heme-ligating imidazole, oxazole, or pyridine group instead of the thiazole moiety (compounds 1, 2, and 3, respectively). Our data show that compound 3 is superior to ritonavir in terms of binding affinity and inhibitory potency owing to greater flexibility and the ability to adopt a conformation that minimizes steric clashing and optimizes protein-ligand interactions. Additionally, Ser119 was identified as a key residue assisting binding of ritonavir-like inhibitors, which emphasizes the importance of polar interactions in the CYP3A4-ligand association.
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==Function==
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Pyridine-Substituted Desoxyritonavir Is a More Potent Inhibitor of Cytochrome P450 3A4 than Ritonavir.,Sevrioukova IF, Poulos TL J Med Chem. 2013 Apr 26. PMID:23586711<ref>PMID:23586711</ref>
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[[http://www.uniprot.org/uniprot/CP3A4_HUMAN CP3A4_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 performs a variety of oxidation reactions (e.g. caffeine 8-oxidation, omeprazole sulphoxidation, midazolam 1'-hydroxylation and midazolam 4-hydroxylation) of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,8-cineole 2-exo-monooxygenase. The enzyme also hydroxylates etoposide.<ref>PMID:11159812</ref>
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[4i4h]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I4H OCA].
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</div>
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==Reference==
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==See Also==
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<ref group="xtra">PMID:023586711</ref><references group="xtra"/><references/>
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*[[Cytochrome P450|Cytochrome P450]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Poulos, T L.]]
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[[Category: Poulos, T L]]
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[[Category: Sevrioukova, I F.]]
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[[Category: Sevrioukova, I F]]
[[Category: Cytochrome b5]]
[[Category: Cytochrome b5]]
[[Category: Cytochrome p450]]
[[Category: Cytochrome p450]]

Revision as of 12:50, 21 December 2014

Crystal structure of CYP3A4 ligated to pyridine-substituted desoxyritonavir

4i4h, resolution 2.90Å

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