4U7I

Structure of the complex of Spartin MIT and IST1 MIM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.794 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Distinct Mechanisms of Recognizing Endosomal Sorting Complex Required for Transport III (ESCRT-III) Protein IST1 by Different Microtubule Interacting and Trafficking (MIT) Domains.

Guo, E.Z.Xu, Z.

(2015) J.Biol.Chem. 290: 8396-8408

  • DOI: 10.1074/jbc.M114.607903
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The endosomal sorting complex required for transport (ESCRT) machinery is responsible for membrane remodeling in a number of biological processes including multivesicular body biogenesis, cytokinesis, and enveloped virus budding. In mammalian cells, ...

    The endosomal sorting complex required for transport (ESCRT) machinery is responsible for membrane remodeling in a number of biological processes including multivesicular body biogenesis, cytokinesis, and enveloped virus budding. In mammalian cells, efficient abscission during cytokinesis requires proper function of the ESCRT-III protein IST1, which binds to the microtubule interacting and trafficking (MIT) domains of VPS4, LIP5, and Spartin via its C-terminal MIT-interacting motif (MIM). Here, we studied the molecular interactions between IST1 and the three MIT domain-containing proteins to understand the structural basis that governs pairwise MIT-MIM interaction. Crystal structures of the three molecular complexes revealed that IST1 binds to the MIT domains of VPS4, LIP5, and Spartin using two different mechanisms (MIM1 mode versus MIM3 mode). Structural comparison revealed that structural features in both MIT and MIM contribute to determine the specific binding mechanism. Within the IST1 MIM sequence, two phenylalanine residues were shown to be important in discriminating MIM1 versus MIM3 binding. These observations enabled us to deduce a preliminary binding code, which we applied to provide CHMP2A, a protein that normally only binds the MIT domain in the MIM1 mode, the additional ability to bind the MIT domain of Spartin in the MIM3 mode.


    Organizational Affiliation

    From the Life Science Institute and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Spartin
A
95Homo sapiensMutation(s): 0 
Gene Names: SPART (KIAA0610, SPG20, TAHCCP1)
Find proteins for Q8N0X7 (Homo sapiens)
Go to Gene View: SPART
Go to UniProtKB:  Q8N0X7
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
IST1 homolog
B
25Homo sapiensMutation(s): 0 
Gene Names: IST1 (KIAA0174)
Find proteins for P53990 (Homo sapiens)
Go to Gene View: IST1
Go to UniProtKB:  P53990
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.794 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.190 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 46.257α = 90.00
b = 46.257β = 90.00
c = 115.620γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2014-07-30 
  • Released Date: 2015-02-11 
  • Deposition Author(s): Guo, E.Z., Xu, Z.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM095769

Revision History 

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-02-18
    Type: Database references
  • Version 1.2: 2015-04-08
    Type: Database references
  • Version 1.3: 2017-09-27
    Type: Author supporting evidence, Database references, Derived calculations, Other, Refinement description, Source and taxonomy