6UPR

Crystal Structure of GTPase Domain of Human Septin 2 / Septin 8 Heterocomplex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Molecular Recognition at Septin Interfaces: The Switches Hold the Key.

Rosa, H.V.D.Leonardo, D.A.Brognara, G.Brandao-Neto, J.D'Muniz Pereira, H.Araujo, A.P.U.Garratt, R.C.

(2020) J Mol Biol 432: 5784-5801

  • DOI: https://doi.org/10.1016/j.jmb.2020.09.001
  • Primary Citation of Related Structures:  
    6UPA, 6UPQ, 6UPR, 6UQQ

  • PubMed Abstract: 

    The assembly of a septin filament requires that homologous monomers must distinguish between one another in establishing appropriate interfaces with their neighbors. To understand this phenomenon at the molecular level, we present the first four crystal structures of heterodimeric septin complexes. We describe in detail the two distinct types of G-interface present within the octameric particles, which must polymerize to form filaments. These are formed between SEPT2 and SEPT6 and between SEPT7 and SEPT3, and their description permits an understanding of the structural basis for the selectivity necessary for correct filament assembly. By replacing SEPT6 by SEPT8 or SEPT11, it is possible to rationalize Kinoshita's postulate, which predicts the exchangeability of septins from within a subgroup. Switches I and II, which in classical small GTPases provide a mechanism for nucleotide-dependent conformational change, have been repurposed in septins to play a fundamental role in molecular recognition. Specifically, it is switch I which holds the key to discriminating between the two different G-interfaces. Moreover, residues which are characteristic for a given subgroup play subtle, but pivotal, roles in guaranteeing that the correct interfaces are formed.


  • Organizational Affiliation

    Instituto de Física de São Carlos, Universidade de São Paulo, Avenida João Dagnone 1100, São Carlos, SP 13563-723, Brazil.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Septin-2274Homo sapiensMutation(s): 0 
Gene Names: SEPTIN2DIFF6KIAA0158NEDD5SEPT2
UniProt & NIH Common Fund Data Resources
Find proteins for Q15019 (Homo sapiens)
Explore Q15019 
Go to UniProtKB:  Q15019
PHAROS:  Q15019
GTEx:  ENSG00000168385 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15019
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Septin-8292Homo sapiensMutation(s): 0 
Gene Names: SEPTIN8KIAA0202SEPT8
UniProt & NIH Common Fund Data Resources
Find proteins for Q92599 (Homo sapiens)
Explore Q92599 
Go to UniProtKB:  Q92599
PHAROS:  Q92599
GTEx:  ENSG00000164402 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92599
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.754α = 90
b = 82.773β = 103.63
c = 78.144γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
xia2data reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Sao Paulo Research Foundation (FAPESP)Brazil2014/15546-1
Sao Paulo Research Foundation (FAPESP)Brazil2016/04658-9

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-23
    Type: Initial release
  • Version 1.1: 2020-09-30
    Changes: Database references
  • Version 1.2: 2020-10-28
    Changes: Database references
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description