2QPE

An unexpected outcome of surface-engineering an integral membrane protein: Improved crystallization of cytochrome ba3 oxidase from Thermus thermophilus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

An unexpected outcome of surface engineering an integral membrane protein: improved crystallization of cytochrome ba(3) from Thermus thermophilus.

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

(2007) Acta Crystallogr Sect F Struct Biol Cryst Commun 63: 1029-1034

  • DOI: 10.1107/S1744309107054176
  • Primary Citation of Related Structures:  
    2QPD, 2QPE

  • PubMed Abstract: 
  • Past work has shown that it is feasible to mutate surface residues of soluble proteins and to a lesser extent membrane proteins in order to improve their crystallization behavior. Described here is a successful application of this approach to the integral membrane protein Thermus thermophilus cytochrome ba(3) oxidase ...

    Past work has shown that it is feasible to mutate surface residues of soluble proteins and to a lesser extent membrane proteins in order to improve their crystallization behavior. Described here is a successful application of this approach to the integral membrane protein Thermus thermophilus cytochrome ba(3) oxidase. Two mutant forms of this enzyme (I-K258R and I-K258R/II-E4Q) were created in which symmetrical crystal contacts within crystals of wild-type enzyme were modified. These mutant proteins had greatly shortened crystallization times, decreasing from approximately 30 d for the wild type to 1-3 d for the mutants, and crystallization was highly reproducible. Native-like proteins crystallize in space group P4(3)2(1)2, whereas the mutant proteins crystallize in space group P4(1)2(1)2 with a different packing arrangement. Crystals of the P4(3)2(1)2 form occasionally diffracted to 2.4-2.3 A resolution following controlled dehydration, while those of the P4(1)2(1)2 form routinely diffracted to between 3.0 and 2.6 A for crystals that had been cryoprotected but not dehydrated.


    Related Citations: 
    • A homologous expression system for obtaining engineered cytochrome ba3 from Thermus thermophilus
      Chen, Y., Hunsicker-Wang, L.M., Pacoma, R.L., Luna, E., Fee, J.A.
      (2005) Protein Expr Purif 40: 299

    Organizational Affiliation

    The Scripps Research Institute, Department of Molecular Biology, MB-8, 10550 North Torrey Pines Road, La Jolla CA 92037, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 1A568Thermus thermophilus HB8Mutation(s): 1 
Gene Names: cbaATTHA1135
EC: 1.9.3.1 (PDB Primary Data), 7.1.1.9 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q5SJ79 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SJ79 
Go to UniProtKB:  Q5SJ79
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SJ79
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase subunit 2B168Thermus thermophilus HB8Mutation(s): 1 
Gene Names: cbaBctaCTTHA1134
EC: 1.9.3.1 (PDB Primary Data), 7.1.1.9 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q5SJ80 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SJ80 
Go to UniProtKB:  Q5SJ80
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SJ80
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c oxidase polypeptide 2AC34Thermus thermophilus HB8Mutation(s): 0 
Gene Names: cbaDTTHA1133
EC: 1.9.3.1 (PDB Primary Data), 7.1.1.9 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for P82543 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore P82543 
Go to UniProtKB:  P82543
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP82543
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HAS
Query on HAS

Download Ideal Coordinates CCD File 
F [auth A]HEME-AS
C54 H64 Fe N4 O6
PDYODZVCODUKFH-QIHJKJTBDH
 Ligand Interaction
HEM
Query on HEM

Download Ideal Coordinates CCD File 
E [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CUA
Query on CUA

Download Ideal Coordinates CCD File 
G [auth B]DINUCLEAR COPPER ION
Cu2
ALKZAGKDWUSJED-UHFFFAOYSA-N
 Ligand Interaction
CU1
Query on CU1

Download Ideal Coordinates CCD File 
D [auth A]COPPER (I) ION
Cu
VMQMZMRVKUZKQL-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.635α = 90
b = 114.635β = 90
c = 148.568γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Blu-Icedata collection
MOSFLMdata reduction
SCALAdata scaling
PHASESphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Source and taxonomy, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations