1ntm

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[[Image:1ntm.gif|left|200px]]
[[Image:1ntm.gif|left|200px]]
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{{Structure
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|PDB= 1ntm |SIZE=350|CAPTION= <scene name='initialview01'>1ntm</scene>, resolution 2.40&Aring;
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The line below this paragraph, containing "STRUCTURE_1ntm", creates the "Structure Box" on the page.
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|SITE=
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|LIGAND= <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Ubiquinol--cytochrome-c_reductase Ubiquinol--cytochrome-c reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.10.2.2 1.10.2.2] </span>
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{{STRUCTURE_1ntm| PDB=1ntm | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ntm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ntm OCA], [http://www.ebi.ac.uk/pdbsum/1ntm PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ntm RCSB]</span>
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'''Crystal Structure of Mitochondrial Cytochrome bc1 Complex at 2.4 Angstrom'''
'''Crystal Structure of Mitochondrial Cytochrome bc1 Complex at 2.4 Angstrom'''
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[[Category: Yu, C.]]
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[[Category: bc1]]
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[[Category: Bc1]]
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[[Category: cytochrome b]]
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[[Category: Cytochrome b]]
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[[Category: cytochrome c1]]
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[[Category: Cytochrome c1]]
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[[Category: Electron transfer]]
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[[Category: iron sulfur protein]]
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[[Category: membrane protein]]
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[[Category: mitochondrial processing peptidase]]
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[[Category: Mitochondrial processing peptidase]]
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[[Category: mpp]]
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[[Category: oxidoreductase]]
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[[Category: Oxidoreductase]]
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[[Category: protease]]
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[[Category: Protease]]
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[[Category: proton translocation]]
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[[Category: Proton translocation]]
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[[Category: qcr]]
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[[Category: Qcr]]
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[[Category: rieske]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:57:50 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:35:19 2008''
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Revision as of 23:57, 2 May 2008

Image:1ntm.gif

Template:STRUCTURE 1ntm

Crystal Structure of Mitochondrial Cytochrome bc1 Complex at 2.4 Angstrom


Overview

Cytochrome bc(1) is an integral membrane protein complex essential to cellular respiration and photosynthesis. The Q cycle reaction mechanism of bc(1) postulates a separated quinone reduction (Q(i)) and quinol oxidation (Q(o)) site. In a complete catalytic cycle, a quinone molecule at the Q(i) site receives two electrons from the b(H) heme and two protons from the negative side of the membrane; this process is specifically inhibited by antimycin A and NQNO. The structures of bovine mitochondrial bc(1) in the presence or absence of bound substrate ubiquinone and with either the bound antimycin A(1) or NQNO were determined and refined. A ubiquinone with its first two isoprenoid repeats and an antimycin A(1) were identified in the Q(i) pocket of the substrate and inhibitor bound structures, respectively; the NQNO, on the other hand, was identified in both Q(i) and Q(o) pockets in the inhibitor complex. The two inhibitors occupied different portions of the Q(i) pocket and competed with substrate for binding. In the Q(o) pocket, the NQNO behaves similarly to stigmatellin, inducing an iron-sulfur protein conformational arrest. Extensive binding interactions and conformational adjustments of residues lining the Q(i) pocket provide a structural basis for the high affinity binding of antimycin A and for phenotypes of inhibitor resistance. A two-water-mediated ubiquinone protonation mechanism is proposed involving three Q(i) site residues His(201), Lys(227), and Asp(228).

About this Structure

1NTM is a Protein complex structure of sequences from Bos taurus. Full crystallographic information is available from OCA.

Reference

Structural basis for the quinone reduction in the bc1 complex: a comparative analysis of crystal structures of mitochondrial cytochrome bc1 with bound substrate and inhibitors at the Qi site., Gao X, Wen X, Esser L, Quinn B, Yu L, Yu CA, Xia D, Biochemistry. 2003 Aug 5;42(30):9067-80. PMID:12885240 Page seeded by OCA on Sat May 3 02:57:50 2008

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