Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: MINIMUM ENERGY 

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This is version 1.3 of the entry. See complete history


Two Homologous Domains of Similar Structure But Different Stability in the Yeast Linker Histone, Hho1P

Ali, T.Coles, P.Stevens, T.J.Stott, K.Thomas, J.O.

(2004) J Mol Biol 338: 139

  • DOI: https://doi.org/10.1016/j.jmb.2004.02.046
  • Primary Citation of Related Structures:  
    1USS, 1UST

  • PubMed Abstract: 

    The Saccharomyces cerevisiae homologue of the linker histone H1, Hho1p, has two domains that are similar in sequence to the globular domain of H1 (and variants such as H5). It is an open question whether both domains are functional and whether they play similar structural roles. Preliminary structural studies showed that the two isolated domains, GI and GII, differ significantly in stability. In 10 mM sodium phosphate (pH 7), the GI domain, like the globular domains of H1 and H5, GH1 and GH5, was stably folded, whereas GII was largely unstructured. However, at high concentrations of large tetrahedral anions (phosphate, sulphate, perchlorate), which might mimic the charge-screening effects of DNA phosphate groups, GII was folded. In view of the potential significance of these observations in relation to the role of Hho1p, we have now determined the structures of its GI and GII domains by NMR spectroscopy under conditions in which GII (like GI) is folded. The backbone r.m.s.d. over the ordered residues is 0.43 A for GI and 0.97 A for GII. Both structures show the "winged-helix" fold typical of GH1 and GH5 and are very similar to each other, with an r.m.s.d. over the structured regions of 1.3 A, although there are distinct differences. The potential for GII to adopt a structure similar to that of GI when Hho1p is bound to chromatin in vivo suggests that both globular domains might be functional. Whether Hho1p performs a structural role by bridging two nucleosomes remains to be determined.

  • Organizational Affiliation

    Cambridge Centre for Molecular Recognition and Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HISTONE H193Saccharomyces cerevisiaeMutation(s): 0 
Find proteins for P53551 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P53551 
Go to UniProtKB:  P53551
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP53551
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: MINIMUM ENERGY 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-04-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-01-15
    Changes: Other