2L0Y

Complex hMia40-hCox17


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Molecular chaperone function of Mia40 triggers consecutive induced folding steps of the substrate in mitochondrial protein import.

Banci, L.Bertini, I.Cefaro, C.Cenacchi, L.Ciofi-Baffoni, S.Felli, I.C.Gallo, A.Gonnelli, L.Luchinat, E.Sideris, D.Tokatlidis, K.

(2010) Proc.Natl.Acad.Sci.USA 107: 20190-20195

  • DOI: 10.1073/pnas.1010095107

  • PubMed Abstract: 
  • Several proteins of the mitochondrial intermembrane space are targeted by internal targeting signals. A class of such proteins with α-helical hairpin structure bridged by two intramolecular disulfides is trapped by a Mia40-dependent oxidative process ...

    Several proteins of the mitochondrial intermembrane space are targeted by internal targeting signals. A class of such proteins with α-helical hairpin structure bridged by two intramolecular disulfides is trapped by a Mia40-dependent oxidative process. Here, we describe the oxidative folding mechanism underpinning this process by an exhaustive structural characterization of the protein in all stages and as a complex with Mia40. Two consecutive induced folding steps are at the basis of the protein-trapping process. In the first one, Mia40 functions as a molecular chaperone assisting α-helical folding of the internal targeting signal of the substrate. Subsequently, in a Mia40-independent manner, folding of the second substrate helix is induced by the folded targeting signal functioning as a folding scaffold. The Mia40-induced folding pathway provides a proof of principle for the general concept that internal targeting signals may operate as a folding nucleus upon compartment-specific activation.


    Organizational Affiliation

    Magnetic Resonance Center, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy. banci@cerm.unifi.it




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitochondrial intermembrane space import and assembly protein 40
A
146Homo sapiensMutation(s): 1 
Gene Names: CHCHD4 (MIA40)
Find proteins for Q8N4Q1 (Homo sapiens)
Go to Gene View: CHCHD4
Go to UniProtKB:  Q8N4Q1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
COX17 cytochrome c oxidase assembly homolog (S. cerevisiae) pseudogene (COX17)
B
67Homo sapiensMutation(s): 1 
Gene Names: COX17
Find proteins for Q14061 (Homo sapiens)
Go to Gene View: COX17
Go to UniProtKB:  Q14061
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 
  • Olderado: 2L0Y Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance