Crystal structure of coiled coil region of human septin 4

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.223 

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Orientational Ambiguity in Septin Coiled Coils and its Structural Basis.

Leonardo, D.A.Cavini, I.A.Sala, F.A.Mendonca, D.C.Rosa, H.V.D.Kumagai, P.S.Crusca Jr., E.Valadares, N.F.Marques, I.A.Brandao-Neto, J.Munte, C.E.Kalbitzer, H.R.Soler, N.Uson, I.Andre, I.Araujo, A.P.U.D'Muniz Pereira, H.Garratt, R.C.

(2021) J Mol Biol 433: 166889-166889

  • DOI: https://doi.org/10.1016/j.jmb.2021.166889
  • Primary Citation of Related Structures:  
    6WB3, 6WBE, 6WBP, 6WCU, 6WSM

  • PubMed Abstract: 

    Septins are an example of subtle molecular recognition whereby different paralogues must correctly assemble into functional filaments important for essential cellular events such as cytokinesis. Most possess C-terminal domains capable of forming coiled coils which are believed to be involved in filament formation and bundling. Here, we report an integrated structural approach which aims to unravel their architectural diversity and in so doing provide direct structural information for the coiled-coil regions of five human septins. Unexpectedly, we encounter dimeric structures presenting both parallel and antiparallel arrangements which are in consonance with molecular modelling suggesting that both are energetically accessible. These sequences therefore code for two metastable states of different orientations which employ different but overlapping interfaces. The antiparallel structures present a mixed coiled-coil interface, one side of which is dominated by a continuous chain of core hydrophilic residues. This unusual type of coiled coil could be used to expand the toolkit currently available to the protein engineer for the design of previously unforeseen coiled-coil based assemblies. Within a physiological context, our data provide the first atomic details related to the assumption that the parallel orientation is likely formed between septin monomers from the same filament whilst antiparallelism may participate in the widely described interfilament cross bridges necessary for higher order structures and thereby septin function.

  • Organizational Affiliation

    São Carlos Institute of Physics, University of São Paulo, Avenida João Dagnone 1100, São Carlos, SP 13563-120, Brazil.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
32Homo sapiensMutation(s): 2 
UniProt & NIH Common Fund Data Resources
Find proteins for O43236 (Homo sapiens)
Explore O43236 
Go to UniProtKB:  O43236
PHAROS:  O43236
GTEx:  ENSG00000108387 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43236
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.223 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 25.763α = 90
b = 41.463β = 90
c = 54.588γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata 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)Brazil2016/04658-9
Sao Paulo Research Foundation (FAPESP)Brazil2018/19992-7
Sao Paulo Research Foundation (FAPESP)Brazil2015/00062-1
Sao Paulo Research Foundation (FAPESP)Brazil2014/15546-1

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-17
    Type: Initial release
  • Version 1.1: 2021-03-24
    Changes: Database references