Structure of GTPase Domain of Human Septin 7 at High Resolution

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

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This is version 1.3 of the entry. See complete history


Revisiting SEPT7 and the slippage of beta-strands in the septin family.

Brognara, G.Pereira, H.M.Brandao-Neto, J.Araujo, A.P.U.Garratt, R.C.

(2019) J Struct Biol 207: 67-73

  • DOI: https://doi.org/10.1016/j.jsb.2019.04.015
  • Primary Citation of Related Structures:  
    6N0B, 6N12

  • PubMed Abstract: 

    Septins are GTP-binding proteins that will often spontaneously assemble into filaments. In some species, particularly budding yeast, it is well known that these are capable of associating with membranes in order to fulfill their cellular role as a component of the cytoskeleton. Different from other human septins, SEPT7 appears to be unique in that it is an essential component of all hetero-oligomeric complexes described to date. As a step towards understanding the molecular basis of filament assembly, here we present two high-resolution structures of the SEPT7 GTPase domain complexed with GDP. One of these reveals a previously unreported coordination for the magnesium ion involving four water molecules and only a tenuous connection to the protein. The higher resolution structures provide unambiguous insight into the interactions at the G-interface where a structural motif based on an antiparallel β-bridge allows for the rationalization of why some septins show nucleotide-dependent β-strand slippage and others do not.

  • Organizational Affiliation

    São Carlos Institute of Physics, University of São Paulo, São Carlos, São Paulo, Brazil.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Septin-7A [auth C],
B [auth A],
C [auth B],
285Homo sapiensMutation(s): 0 
Gene Names: SEPT7CDC10
UniProt & NIH Common Fund Data Resources
Find proteins for Q16181 (Homo sapiens)
Explore Q16181 
Go to UniProtKB:  Q16181
PHAROS:  Q16181
GTEx:  ENSG00000122545 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16181
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.513α = 90
b = 68.866β = 112.76
c = 150.519γ = 90
Software Package:
Software NamePurpose
xia2data scaling
PDB_EXTRACTdata extraction
xia2data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

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

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-01
    Type: Initial release
  • Version 1.1: 2019-06-19
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description