View source for 6qca


==Ovine respiratory complex I FRC open class 5==
<SX load='6qca' size='340' side='right' viewer='molstar' caption='[[6qca]], [[Resolution|resolution]] 6.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6qca]] is a 45 chain structure with sequence from [http://en.wikipedia.org/wiki/Ovis_aries Ovis aries]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6QCA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6QCA FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene>, <scene name='pdbligand=ZMP:S-[2-({N-[(2S)-2-HYDROXY-3,3-DIMETHYL-4-(PHOSPHONOOXY)BUTANOYL]-BETA-ALANYL}AMINO)ETHYL]+TETRADECANETHIOATE'>ZMP</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6qbx|6qbx]], [[6qc3|6qc3]], [[6qc2|6qc2]], [[6qc4|6qc4]], [[6q9d|6q9d]], [[6q9b|6q9b]], [[6q9e|6q9e]], [[6qa9|6qa9]], [[6qc5|6qc5]], [[6qc6|6qc6]], [[6qc8|6qc8]], [[6qc7|6qc7]], [[6qc9|6qc9]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/NADH:ubiquinone_reductase_(H(+)-translocating) NADH:ubiquinone reductase (H(+)-translocating)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=7.1.1.2 7.1.1.2] </span></td></tr>
<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=6qca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6qca OCA], [http://pdbe.org/6qca PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6qca RCSB], [http://www.ebi.ac.uk/pdbsum/6qca PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6qca ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/W5P9Q8_SHEEP W5P9Q8_SHEEP]] Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[PIRNR:PIRNR017834] [[http://www.uniprot.org/uniprot/NU4LM_SHEEP NU4LM_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). [[http://www.uniprot.org/uniprot/W5NQT7_SHEEP W5NQT7_SHEEP]] Carrier of the growing fatty acid chain in fatty acid biosynthesis.[RuleBase:RU000722] [[http://www.uniprot.org/uniprot/NU3M_SHEEP NU3M_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). [[http://www.uniprot.org/uniprot/B9VGZ9_SHEEP B9VGZ9_SHEEP]] Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[RuleBase:RU363103] [[http://www.uniprot.org/uniprot/W5PYA5_SHEEP W5PYA5_SHEEP]] Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[PIRNR:PIRNR017016] [[http://www.uniprot.org/uniprot/W5Q1B0_SHEEP W5Q1B0_SHEEP]] Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[PIRNR:PIRNR009288] [[http://www.uniprot.org/uniprot/NU6M_SHEEP NU6M_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). [[http://www.uniprot.org/uniprot/NU2M_SHEEP NU2M_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). [[http://www.uniprot.org/uniprot/NU5M_SHEEP NU5M_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). [[http://www.uniprot.org/uniprot/NU4M_SHEEP NU4M_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). [[http://www.uniprot.org/uniprot/W5QBF5_SHEEP W5QBF5_SHEEP]] Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[PIRNR:PIRNR000543] [[http://www.uniprot.org/uniprot/W5QAH8_SHEEP W5QAH8_SHEEP]] Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.[PIRNR:PIRNR005822] [[http://www.uniprot.org/uniprot/NU1M_SHEEP NU1M_SHEEP]] Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The mitochondrial electron transport chain complexes are organized into supercomplexes (SCs) of defined stoichiometry, which have been proposed to regulate electron flux via substrate channeling. We demonstrate that CoQ trapping in the isolated SC I+III2 limits complex (C)I turnover, arguing against channeling. The SC structure, resolved at up to 3.8 A in four distinct states, suggests that CoQ oxidation may be rate limiting because of unequal access of CoQ to the active sites of CIII2. CI shows a transition between "closed" and "open" conformations, accompanied by the striking rotation of a key transmembrane helix. Furthermore, the state of CI affects the conformational flexibility within CIII2, demonstrating crosstalk between the enzymes. CoQ was identified at only three of the four binding sites in CIII2, suggesting that interaction with CI disrupts CIII2 symmetry in a functionally relevant manner. Together, these observations indicate a more nuanced functional role for the SCs.

Structures of Respiratory Supercomplex I+III2 Reveal Functional and Conformational Crosstalk.,Letts JA, Fiedorczuk K, Degliesposti G, Skehel M, Sazanov LA Mol Cell. 2019 Sep 19;75(6):1131-1146.e6. doi: 10.1016/j.molcel.2019.07.022. Epub, 2019 Sep 3. PMID:31492636<ref>PMID:31492636</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6qca" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</SX>
[[Category: Large Structures]]
[[Category: Ovis aries]]
[[Category: Letts, J A]]
[[Category: Sazanov, L A]]
[[Category: Cellular respiration]]
[[Category: Complex i]]
[[Category: Electron transport]]
[[Category: Mitochondria]]