1T3J

Mitofusin domain HR2 V686M/I708M mutant

• PDB DOI: https://doi.org/10.2210/pdb1T3J/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2004-04-26 Released: 2004-08-17 
• Deposition Author(s): Koshiba, T., Detmer, S.A., Kaiser, J.T., Chen, H., McCaffery, J.M., Chan, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.286 
• R-Value Work: 0.241 

Literature

Structural basis of mitochondrial tethering by mitofusin complexes

Koshiba, T., Detmer, S.A., Kaiser, J.T., Chen, H., McCaffery, J.M., Chan, D.C.

(2004) Science 305: 858-862

• PubMed: 15297672 
• DOI: https://doi.org/10.1126/science.1099793
• Primary Citation of Related Structures:  
  1T3J


• PubMed Abstract: 
  

  Vesicle fusion involves vesicle tethering, docking, and membrane merger. We show that mitofusin, an integral mitochondrial membrane protein, is required on adjacent mitochondria to mediate fusion, which indicates that mitofusin complexes act in trans (that is, between adjacent mitochondria). A heptad repeat region (HR2) mediates mitofusin oligomerization by assembling a dimeric, antiparallel coiled coil. The transmembrane segments are located at opposite ends of the 95 angstrom coiled coil and provide a mechanism for organelle tethering. Consistent with this proposal, truncated mitofusin, in an HR2-dependent manner, causes mitochondria to become apposed with a uniform gap. Our results suggest that HR2 functions as a mitochondrial tether before fusion.

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Organizational Affiliation: 

Division of Biology, California Institute of Technology, 1200 East California Boulevard, MC114-96, Pasadena, CA 91125, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 11.11 kDa 
• Atom Count: 546 
• Modelled Residue Count: 62 
• Deposited Residue Count: 96 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
mitofusin 1	A	96	Mus musculus	Mutation(s): 2  Gene Names: MFN1
UniProt & NIH Common Fund Data Resources
Find proteins for Q811U4 (Mus musculus) Explore Q811U4  Go to UniProtKB:  Q811U4
IMPC:  MGI:1914664

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.286 
• R-Value Work: 0.241 
• Space Group: F 4₁ 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 162.83	α = 90
b = 162.83	β = 90
c = 162.83	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
MLPHARE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-08-17 
Deposition Author(s): Koshiba, T., Detmer, S.A., Kaiser, J.T., Chen, H., McCaffery, J.M., Chan, D.C.

Revision History  

• Version 1.0: 2004-08-17
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2021-10-27
  Changes: Database references
• Version 1.4: 2024-02-14
  Changes: Data collection