2ZXT

Crystal structure of Tim40/MIA40, a disulfide relay system in mitochondria, solved as MBP fusion protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis of yeast Tim40/Mia40 as an oxidative translocator in the mitochondrial intermembrane space.

Kawano, S.Yamano, K.Naoe, M.Momose, T.Terao, K.Nishikawa, S.Watanabe, N.Endo, T.

(2009) Proc.Natl.Acad.Sci.USA 106: 14403-14407

  • DOI: 10.1073/pnas.0901793106
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mitochondrial intermembrane space (IMS) contains many small cysteine-bearing proteins, and their passage across the outer membrane and subsequent folding require recognition and disulfide bond transfer by an oxidative translocator Tim40/Mia40 in ...

    The mitochondrial intermembrane space (IMS) contains many small cysteine-bearing proteins, and their passage across the outer membrane and subsequent folding require recognition and disulfide bond transfer by an oxidative translocator Tim40/Mia40 in the inner membrane facing the IMS. Here we determined the crystal structure of the core domain of yeast Mia40 (Mia40C4) as a fusion protein with maltose-binding protein at a resolution of 3 A. The overall structure of Mia40C4 is a fruit-dish-like shape with a hydrophobic concave region, which accommodates a linker segment of the fusion protein in a helical conformation, likely mimicking a bound substrate. Replacement of the hydrophobic residues in this region resulted in growth defects and impaired assembly of a substrate protein. The Cys296-Cys298 disulfide bond is close to the hydrophobic concave region or possible substrate-binding site, so that it can mediate disulfide bond transfer to substrate proteins. These results are consistent with the growth phenotypes of Mia40 mutant cells containing Ser replacement of the conserved cysteine residues.


    Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maltose-binding periplasmic protein, LINKER, Mitochondrial intermembrane space import and assembly protein 40
A
465Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Escherichia coli (strain K12)
This entity is chimeric
Mutation(s): 0 
Gene Names: MIA40 (TIM40), malE
Find proteins for P36046 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P36046
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEX9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAL
Query on MAL

Download SDF File 
Download CCD File 
A
MALTOSE
C12 H22 O11
GUBGYTABKSRVRQ-ASMJPISFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.263α = 90.00
b = 101.403β = 90.00
c = 109.355γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-08-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2014-07-16
    Type: Database references
  • Version 1.3: 2017-06-28
    Type: Source and taxonomy