5t6q: Difference between revisions

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New page: '''Unreleased structure''' The entry 5t6q is ON HOLD Authors: Hsu, M., Johnson, E.F. Description: Structure of cytochrome P450 4B1 (CYP4B1) complexed with octane: An n-Alkane and fatty...
 
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'''Unreleased structure'''


The entry 5t6q is ON HOLD
==Structure of cytochrome P450 4B1 (CYP4B1) complexed with octane: An n-Alkane and fatty acid omega-hydroxylase with a covalently bound heme==
<StructureSection load='5t6q' size='340' side='right'caption='[[5t6q]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5t6q]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5T6Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5T6Q FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.701&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=OCT:N-OCTANE'>OCT</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5t6q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5t6q OCA], [https://pdbe.org/5t6q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5t6q RCSB], [https://www.ebi.ac.uk/pdbsum/5t6q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5t6q ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CP4B1_RABIT CP4B1_RABIT] 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.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
P450 family 4 fatty acid omega-hydroxylases preferentially oxygenate primary C-H bonds over adjacent, energetically favored secondary C-H bonds, but the mechanism explaining this intriguing preference is unclear. To this end, the structure of rabbit P450 4B1 complexed with its substrate octane was determined by X-ray crystallography to define features of the active site that contribute to a preference for omega-hydroxylation. The structure indicated that octane is bound in a narrow active site cavity that limits access of the secondary C-H bond to the reactive intermediate. A highly conserved sequence motif on helix I contributes to positioning the terminal carbon of octane for omega-hydroxylation. Glu-310 of this motif auto-catalytically forms an ester bond with the heme 5-methyl, and the immobilized E310 contributes to substrate positioning. The preference for omega-hydroxylation was decreased in a E310A mutant having a shorter side-chain, but overall rates of metabolism were retained. E310D and E310Q substitutions having longer side-chains exhibit lower overall rates, likely due to higher conformational entropy for these residues, but they retained high preferences for octane omega-hydroxylation. Sequence comparisons indicated that active-site residues constraining octane for omega-hydroxylation are conserved in family 4 P450s. Moreover, the heme 7-propionate is positioned in the active site and provides additional restraints on substrate binding. In conclusion, P450 4B1 exhibits structural adaptations for omega-hydroxylation that include changes in the conformation of the heme and changes in a highly conserved helix I motif that is associated with selective oxygenation of un-activated primary C-H bonds.


Authors: Hsu, M., Johnson, E.F.
The Crystal Structure of Cytochrome P450 4B1 (CYP4B1) Monoxygenase Complexed with Octane Discloses Several Structural Adaptations for omega-Hydroxylation.,Hsu MH, Baer BR, Rettie AE, Johnson EF J Biol Chem. 2017 Feb 6. pii: jbc.M117.775494. doi: 10.1074/jbc.M117.775494. PMID:28167536<ref>PMID:28167536</ref>


Description: Structure of cytochrome P450 4B1 (CYP4B1) complexed with octane: An n-Alkane and fatty acid omega-hydroxylase with a covalently bound heme
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[Category: Unreleased Structures]]
</div>
[[Category: Hsu, M]]
<div class="pdbe-citations 5t6q" style="background-color:#fffaf0;"></div>
[[Category: Johnson, E.F]]
 
==See Also==
*[[Cytochrome P450 3D structures|Cytochrome P450 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Oryctolagus cuniculus]]
[[Category: Hsu M]]
[[Category: Johnson EF]]
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