3BVD

Structure of Surface-engineered Cytochrome ba3 Oxidase from Thermus thermophilus under Xenon Pressure, 100psi 5min


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.37 Å
  • R-Value Free: 0.336 
  • R-Value Work: 0.292 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystallographic Studies of Xe and Kr Binding within the Large Internal Cavity of Cytochrome ba3 from Thermus thermophilus: Structural Analysis and Role of Oxygen Transport Channels in the Heme-Cu Oxidases.

Luna, V.M.Chen, Y.Fee, J.A.Stout, C.D.

(2008) Biochemistry 47: 4657-4665

  • DOI: 10.1021/bi800045y

  • PubMed Abstract: 
  • Cytochrome ba3 is a cytochrome c oxidase from the plasma membrane of Thermus thermophilus and is the preferred terminal enzyme of cellular respiration at low dioxygen tensions. Using cytochrome ba 3 crystals pressurized at varying conditions under Xe ...

    Cytochrome ba3 is a cytochrome c oxidase from the plasma membrane of Thermus thermophilus and is the preferred terminal enzyme of cellular respiration at low dioxygen tensions. Using cytochrome ba 3 crystals pressurized at varying conditions under Xe or Kr gas, and X-ray data for six crystals, we identify the relative affinities of Xe and Kr atoms for as many as seven distinct binding sites. These sites track a continuous, Y-shaped channel, 18-20 A in length, lined by hydrophobic residues, which leads from the surface of the protein where two entrance holes, representing the top of the Y, connect the bilayer to the a3-CuB center at the base of the Y. Considering the increased affinity of O2 for hydrophobic environments, the hydrophobic nature of the channel, its orientation within the bilayer, its connection to the active site, its uniform diameter, its virtually complete occupation by Xe, and its isomorphous presence in the native enzyme, we infer that the channel is a diffusion pathway for O2 into the dinuclear center of cytochrome ba3. These observations provide a basis for analyzing similar channels in other oxidases of known structure, and these structures are discussed in terms of mechanisms of O2 transport in biological systems, details of CO binding to and egress from the dinuclear center, the bifurcation of the oxygen-in and water-out pathways, and the possible role of the oxygen channel in aerobic thermophily.


    Related Citations: 
    • A novel cryoprotection scheme for enchancing the diffraction of crystals of recombinant cytochrome ba3 oxidase from Thermus thermophilus
      Hunsicker-Wang, L.M.,Pacoma, R.L.,Chen, Y.,Fee, J.A.,Stout, C.D.
      (2005) Acta Crystallogr.,Sect.D 61: 340
    • An unexpected outcome of surface engineering an integral membrane protein: improved crystallization of cytochrome ba3 from Thermus thermophilus
      Liu, B.,Luna, V.M.,Chen, Y.,Stout, C.D.,Fee, J.A.
      (2007) Acta Crystallogr.,Sect.F 63: 1029


    Organizational Affiliation

    Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 1
A
568Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Gene Names: cbaA
EC: 1.9.3.1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex IV (Cytochrome C Oxidase)
Protein: 
Cytochrome ba3
Find proteins for Q5SJ79 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SJ79
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase subunit 2
B
168Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Gene Names: cbaB (ctaC)
EC: 1.9.3.1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex IV (Cytochrome C Oxidase)
Protein: 
Cytochrome ba3
Find proteins for Q5SJ80 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SJ80
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Cytochrome c oxidase polypeptide 2A
C
34Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Gene Names: cbaD
EC: 1.9.3.1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Electron Transport Chain Complexes: Complex IV (Cytochrome C Oxidase)
Protein: 
Cytochrome ba3
Find proteins for P82543 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  P82543
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HAS
Query on HAS

Download SDF File 
Download CCD File 
A
HEME-AS
C54 H64 Fe N4 O6
PDYODZVCODUKFH-QIHJKJTBDH
 Ligand Interaction
CUA
Query on CUA

Download SDF File 
Download CCD File 
B
DINUCLEAR COPPER ION
Cu2
ALKZAGKDWUSJED-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CU
Query on CU

Download SDF File 
Download CCD File 
A
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
XE
Query on XE

Download SDF File 
Download CCD File 
A
XENON
Xe
FHNFHKCVQCLJFQ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.37 Å
  • R-Value Free: 0.336 
  • R-Value Work: 0.292 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 119.726α = 90.00
b = 119.726β = 90.00
c = 153.535γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACphasing
MOSFLMdata reduction
CNSphasing
Blu-Icedata collection
MOLREPphasing
Cootmodel building
REFMACrefinement
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-05-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-10-25
    Type: Refinement description