Crystal Structure of the Histone domain of Son of Sevenless

Experimental Data Snapshot

  • Resolution: 3.21 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.255 

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Tandem Histone Folds in the Structure of the N-terminal Segment of the Ras Activator Son of Sevenless

Sondermann, H.Soisson, S.M.Bar-Sagi, D.Kuriyan, J.

(2003) Structure 11: 1583-1593

  • DOI: https://doi.org/10.1016/j.str.2003.10.015
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Ras activator Son of Sevenless (Sos) contains a Cdc25 homology domain, responsible for nucleotide exchange, as well as Dbl/Pleckstrin homology (DH/PH) domains. We have determined the crystal structure of the N-terminal segment of human Sos1 (residues 1-191) and show that it contains two tandem histone folds. While the N-terminal domain is monomeric in solution, its structure is surprisingly similar to that of histone dimers, with both subunits of the histone "dimer" being part of the same peptide chain. One histone fold corresponds to the region of Sos that is clearly similar in sequence to histones (residues 91-191), whereas the other is formed by residues in Sos (1-90) that are unrelated in sequence to histones. Residues that form a contiguous patch on the surface of the histone domain of Sos are conserved from C. elegans to humans, suggesting a potential role for this domain in protein-protein interactions.

  • Organizational Affiliation

    Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California-Berkeley, Berkeley, CA 94720, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Son of sevenless protein
A, B, C, D, E
A, B, C, D, E, F, G, H, I
191Homo sapiensMutation(s): 4 
Gene Names: SOS1
UniProt & NIH Common Fund Data Resources
Find proteins for Q07889 (Homo sapiens)
Explore Q07889 
Go to UniProtKB:  Q07889
PHAROS:  Q07889
GTEx:  ENSG00000115904 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07889
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D, E
A, B, C, D, E, F, G, H, I
Experimental Data & Validation

Experimental Data

  • Resolution: 3.21 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.255 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.397α = 90
b = 109.199β = 90
c = 212.399γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance