3JC1

Electron cryo-microscopy of the IST1-CHMP1B ESCRT-III copolymer


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and membrane remodeling activity of ESCRT-III helical polymers.

McCullough, J.Clippinger, A.K.Talledge, N.Skowyra, M.L.Saunders, M.G.Naismith, T.V.Colf, L.A.Afonine, P.Arthur, C.Sundquist, W.I.Hanson, P.I.Frost, A.

(2015) Science 350: 1548-1551

  • DOI: 10.1126/science.aad8305
  • Primary Citation of Related Structures:  
    3JC1

  • PubMed Abstract: 
  • The endosomal sorting complexes required for transport (ESCRT) proteins mediate fundamental membrane remodeling events that require stabilizing negative membrane curvature. These include endosomal intralumenal vesicle formation, HIV budding, nuclear envelope closure, and cytokinetic abscission ...

    The endosomal sorting complexes required for transport (ESCRT) proteins mediate fundamental membrane remodeling events that require stabilizing negative membrane curvature. These include endosomal intralumenal vesicle formation, HIV budding, nuclear envelope closure, and cytokinetic abscission. ESCRT-III subunits perform key roles in these processes by changing conformation and polymerizing into membrane-remodeling filaments. Here, we report the 4 angstrom resolution cryogenic electron microscopy reconstruction of a one-start, double-stranded helical copolymer composed of two different human ESCRT-III subunits, charged multivesicular body protein 1B (CHMP1B) and increased sodium tolerance 1 (IST1). The inner strand comprises "open" CHMP1B subunits that interlock in an elaborate domain-swapped architecture and is encircled by an outer strand of "closed" IST1 subunits. Unlike other ESCRT-III proteins, CHMP1B and IST1 polymers form external coats on positively curved membranes in vitro and in vivo. Our analysis suggests how common ESCRT-III filament architectures could stabilize different degrees and directions of membrane curvature.


    Organizational Affiliation

    Department of Biochemistry, University of Utah, Salt Lake City, UT 84112, USA. Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA. wes@biochem.utah.edu phanson22@wustl.edu adam.frost@ucsf.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Increased Sodium Tolerance 1 (IST1)AaAcAeAgAiAkAmAoAaAcAeAgAiAkAmAoAqAsAuAwAyBaBcBeBgBiBkBmBoBqBsBuBwByCaCcCeCgCiCkCmCo
182Homo sapiensMutation(s): 0 
Gene Names: IST1KIAA0174
Find proteins for P53990 (Homo sapiens)
Explore P53990 
Go to UniProtKB:  P53990
NIH Common Fund Data Resources
PHAROS:  P53990
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Charged multivesicular body protein 1bAbAdAfAhAjAlAnApAbAdAfAhAjAlAnApArAtAvAxAzBbBdBfBhBjBlBnBpBrBtBvBxBzCbCdCfChCjClCnCp
160Homo sapiensMutation(s): 0 
Gene Names: C18orf2CHMP1B
Membrane protein
Mpstruc
Group: 
MONOTOPIC MEMBRANE PROTEINS
Sub Group: 
Membrane-Shaping Proteins
Protein: 
IST1-CHMP1B ESCRT-III copolymer
Find proteins for Q7LBR1 (Homo sapiens)
Explore Q7LBR1 
Go to UniProtKB:  Q7LBR1
NIH Common Fund Data Resources
PHAROS:  Q7LBR1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-16
    Type: Initial release
  • Version 1.1: 2015-12-30
    Changes: Database references
  • Version 1.2: 2018-07-18
    Changes: Author supporting evidence, Data collection