5B1B

Bovine heart cytochrome c oxidase in the fully reduced state at 1.6 angstrom resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Mg2+-containing Water Cluster of Mammalian Cytochrome c Oxidase Collects Four Pumping Proton Equivalents in Each Catalytic Cycle.

Yano, N.Muramoto, K.Shimada, A.Takemura, S.Baba, J.Fujisawa, H.Mochizuki, M.Shinzawa-Itoh, K.Yamashita, E.Tsukihara, T.Yoshikawa, S.

(2016) J Biol Chem 291: 23882-23894

  • DOI: 10.1074/jbc.M115.711770
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Bovine heart cytochrome c oxidase (CcO) pumps four proton equivalents per catalytic cycle through the H-pathway, a proton-conducting pathway, which includes a hydrogen bond network and a water channel operating in tandem. Protons are transferred by H ...

    Bovine heart cytochrome c oxidase (CcO) pumps four proton equivalents per catalytic cycle through the H-pathway, a proton-conducting pathway, which includes a hydrogen bond network and a water channel operating in tandem. Protons are transferred by H 3 O + through the water channel from the N-side into the hydrogen bond network, where they are pumped to the P-side by electrostatic repulsion between protons and net positive charges created at heme a as a result of electron donation to O 2 bound to heme a 3 To block backward proton movement, the water channel remains closed after O 2 binding until the sequential four-proton pumping process is complete. Thus, the hydrogen bond network must collect four proton equivalents before O 2 binding. However, a region with the capacity to accept four proton equivalents was not discernable in the x-ray structures of the hydrogen bond network. The present x-ray structures of oxidized/reduced bovine CcO are improved from 1.8/1.9 to 1.5/1.6 Å resolution, increasing the structural information by 1.7/1.6 times and revealing that a large water cluster, which includes a Mg 2+ ion, is linked to the H-pathway. The cluster contains enough proton acceptor groups to retain four proton equivalents. The redox-coupled x-ray structural changes in Glu 198 , which bridges the Mg 2+ and Cu A (the initial electron acceptor from cytochrome c) sites, suggest that the Cu A -Glu 198 -Mg 2+ system drives redox-coupled transfer of protons pooled in the water cluster to the H-pathway. Thus, these x-ray structures indicate that the Mg 2+ -containing water cluster is the crucial structural element providing the effective proton pumping in bovine CcO.


    Organizational Affiliation

    From the Picobiology Institute and yoshi@sci.u-hyogo.ac.jp.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 1A, N514Bos taurusMutation(s): 0 
Gene Names: MT-CO1COICOXIMTCO1
EC: 1.9.3.1 (PDB Primary Data), 7.1.1.9 (UniProt)
Find proteins for P00396 (Bos taurus)
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 2B, O227Bos taurusMutation(s): 0 
Gene Names: MT-CO2COIICOX2COXIIMTCO2
EC: 7.1.1.9
Find proteins for P68530 (Bos taurus)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 3C, P261Bos taurusMutation(s): 0 
Gene Names: MT-CO3COIIICOXIIIMTCO3
EC: 7.1.1.9
Find proteins for P00415 (Bos taurus)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 4 isoform 1, mitochondrialD, Q147Bos taurusMutation(s): 0 
Gene Names: COX4I1COX4
Find proteins for P00423 (Bos taurus)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 5A, mitochondrialE, R109Bos taurusMutation(s): 0 
Gene Names: COX5A
Find proteins for P00426 (Bos taurus)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 5B, mitochondrialF, S98Bos taurusMutation(s): 0 
Gene Names: COX5B
Find proteins for P00428 (Bos taurus)
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 6A2, mitochondrialG, T85Bos taurusMutation(s): 0 
Gene Names: COX6A2COX6A
Find proteins for P07471 (Bos taurus)
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 6B1H, U85Bos taurusMutation(s): 0 
Gene Names: COX6B1COX6B
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 6CI, V73Bos taurusMutation(s): 0 
Gene Names: COX6C
Find proteins for P04038 (Bos taurus)
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 7A1, mitochondrialJ, W59Bos taurusMutation(s): 0 
Gene Names: COX7A1COX7ACOX7AH
Find proteins for P07470 (Bos taurus)
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 7C, mitochondrialL, Y47Bos taurusMutation(s): 0 
Gene Names: COX7CCOX7CP1
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 8B, mitochondrialM, Z46Bos taurusMutation(s): 0 
Gene Names: COX8BCOX8H
Find proteins for P10175 (Bos taurus)
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 7B, mitochondrialK, X56Bos taurusMutation(s): 0 
Gene Names: COX7B
Find proteins for P13183 (Bos taurus)
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  • Reference Sequence
Small Molecules
Ligands 14 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

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C, G, P, T
CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
 Ligand Interaction
TGL
Query on TGL

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B, D, L, N, Q
TRISTEAROYLGLYCEROL
C57 H110 O6
DCXXMTOCNZCJGO-UHFFFAOYSA-N
 Ligand Interaction
HEA
Query on HEA

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A, N
HEME-A
C49 H56 Fe N4 O6
ZGGYGTCPXNDTRV-PRYGPKJJSA-L
 Ligand Interaction
PEK
Query on PEK

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C, G, T
(1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(STEAROYLOXY)METHYL]ETHYL (5E,8E,11E,14E)-ICOSA-5,8,11,14-TETRAENOATE
C43 H78 N O8 P
ANRKEHNWXKCXDB-BHFWLYLHSA-N
 Ligand Interaction
PSC
Query on PSC

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B, R
(7R,17E,20E)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSA-17,20-DIEN-1-AMINIUM 4-OXIDE
C42 H81 N O8 P
JLPULHDHAOZNQI-AUSZDXHESA-O
 Ligand Interaction
PGV
Query on PGV

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A, C, N, P
(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE
C40 H77 O10 P
ADYWCMPUNIVOEA-GPJPVTGXSA-N
 Ligand Interaction
DMU
Query on DMU

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C, M, P, Z
DECYL-BETA-D-MALTOPYRANOSIDE
C22 H42 O11
WOQQAWHSKSSAGF-WXFJLFHKSA-N
 Ligand Interaction
CHD
Query on CHD

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B, C, G, J, P, W
CHOLIC ACID
C24 H40 O5
BHQCQFFYRZLCQQ-OELDTZBJSA-N
 Ligand Interaction
CUA
Query on CUA

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B, O
DINUCLEAR COPPER ION
Cu2
ALKZAGKDWUSJED-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

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F, S
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

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A, N
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A, N
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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A, N
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
UNX
Query on UNX

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C, P
UNKNOWN ATOM OR ION
X
 Ligand Interaction
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
FME
Query on FME
A,NL-PEPTIDE LINKINGC6 H11 N O3 SMET
TPO
Query on TPO
G,TL-PEPTIDE LINKINGC4 H10 N O6 PTHR
SAC
Query on SAC
I,VL-PEPTIDE LINKINGC5 H9 N O4SER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 181.606α = 90
b = 204.14β = 90
c = 177.653γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
the Japanese Ministry of Education, Culture, Sports, Science and TechnologyJapan2247012
the Japanese Ministry of Education, Culture, Sports, Science and TechnologyJapan22370060
the Japanese Ministry of Education, Culture, Sports, Science and TechnologyJapan26291033

Revision History 

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2016-11-23
    Changes: Database references
  • Version 1.2: 2020-02-26
    Changes: Data collection, Database references, Derived calculations