1CIH

STRUCTURAL AND FUNCTIONAL EFFECTS OF MULTIPLE MUTATIONS AT DISTAL SITES IN CYTOCHROME C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structural and functional effects of multiple mutations at distal sites in cytochrome c.

Lo, T.P.Komar-Panicucci, S.Sherman, F.McLendon, G.Brayer, G.D.

(1995) Biochemistry 34: 5259-5268

  • DOI: https://doi.org/10.1021/bi00015a041
  • Primary Citation of Related Structures:  
    1CIE, 1CIF, 1CIG, 1CIH

  • PubMed Abstract: 

    Multiple mutations at distally located sites have been introduced into yeast iso-1 cytochrome c to determine the contributions of three amino acids to the structural and functional properties of this protein. The mutant proteins, for which high-resolution structures were determined, included all possible combinations of the substitutions Arg38Ala, Asn52Ile, and Phe82Ser. Arg38, Asn52, and Phe82 are all conserved in the primary sequences of eukaryotic cytochromes c and have been shown to significantly affect several properties of these proteins including protein stability, heme reduction potential, and oxidation state dependent conformational changes. The present studies show that the structural consequences of each amino acid substitution in combinatorial mutant proteins were similar to those observed in the related single-mutant proteins, and therefore no synergistic effect between mutation sites was observed for this feature. With respect to protein stability, the effect of individual mutations can be understood from the structural changes observed for each. It is found that stability effects of the three mutation sites are independent and cumulative in multiple-mutant proteins. This reflects the independent nature of the structural changes induced at the three distally located mutation sites. In terms of heme reduction potential two effects are observed. For substitution of Phe82 by serine, the mechanism by which reduction potential is lowered is different from that occurring at either the Arg38 or the Asn52 site and is independent of residue replacements at these latter two positions. For Arg38 and Asn52, overlapping interactions lead to a higher reduction potential than expected from a strict additive effect of substitutions at these residues. This appears to arise from interaction of these two amino acids with a common heme element, namely, the heme propionate A group. The present results underscore the difficulty of predicting synergistic effects of multiple mutations within a protein.


  • Organizational Affiliation

    Department of Biochemistry, University of British Columbia, Vancouver, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYTOCHROME C108Saccharomyces cerevisiaeMutation(s): 0 
UniProt
Find proteins for P00044 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P00044 
Go to UniProtKB:  P00044
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00044
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEC
Query on HEC

Download Ideal Coordinates CCD File 
C [auth A]HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
B [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
M3L
Query on M3L
A
L-PEPTIDE LINKINGC9 H21 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Observed: 0.200 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.48α = 90
b = 36.48β = 90
c = 137.28γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-01-26
    Type: Initial release
  • Version 1.1: 2008-03-21
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 2.0: 2021-03-03
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary