3QK9

Yeast Tim44 C-terminal domain complexed with Cymal-3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.312 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Membrane Binding Mechanism of Yeast Mitochondrial Peripheral Membrane Protein TIM44.

Cui, W.Josyula, R.Li, J.Fu, Z.Sha, B.

(2011) Protein Pept Lett 18: 718-725

  • DOI: 10.2174/092986611795445996
  • Primary Citation of Related Structures:  
    3QK9

  • PubMed Abstract: 
  • The protein translocations across mitochondrial membranes are carried out by specialized complexes, the Translocase of Outer Membrane (TOM) and Translocase of Inner Membrane (TIM). TIM23 translocon is responsible for translocating the mitochondrial matrix proteins across the mitochondrial inner membrane ...

    The protein translocations across mitochondrial membranes are carried out by specialized complexes, the Translocase of Outer Membrane (TOM) and Translocase of Inner Membrane (TIM). TIM23 translocon is responsible for translocating the mitochondrial matrix proteins across the mitochondrial inner membrane. Tim44 is an essential, peripheral membrane protein in TIM23 complex. Tim44 is tightly associated with the inner mitochondrial membrane on the matrix side. The Tim44 C-Terminal Domain (CTD) functions as an Inner Mitochondrial Membrane (IMM) anchor that recruits the Presequence protein Associated Motor (PAM) to the TIM23 channel. Using X-ray crystallographic and biochemical data, we show that the N-terminal helices A1 and A2 of Tim44 - CTD are crucial for its membrane tethering function. Based on our data, we propose a model showing how the N-terminal A1 and A2 amphipathic helices can either expose their hydrophobic face during membrane binding or conceal it in the soluble form. Therefore, the A1 and A2 helices of Tim44 may function as a membrane sensor.


    Organizational Affiliation

    Department of Cell Biology, University of Alabama at Birmingham, AL 35294-0005, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitochondrial import inner membrane translocase subunit TIM44A, B222Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: TIM44ISP45MIM44MPI1YIL022W
UniProt
Find proteins for Q01852 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q01852 
Go to UniProtKB:  Q01852
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ01852
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.312 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.595α = 90
b = 100.595β = 90
c = 209.79γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling
PHASESphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-07-20
    Changes: Database references