3QK9

Yeast Tim44 C-terminal domain complexed with Cymal-3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.235 

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


  • 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 m ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitochondrial import inner membrane translocase subunit TIM44
A, B
222Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: TIM44 (ISP45, MIM44, MPI1)
Find proteins for Q01852 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q01852
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.235 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 100.595α = 90.00
b = 100.595β = 90.00
c = 209.790γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
PHASESphasing
PDB_EXTRACTdata extraction
REFMACrefinement
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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