1AAB

NMR STRUCTURE OF RAT HMG1 HMGA FRAGMENT


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 33 

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This is version 1.2 of the entry. See complete history

Literature

Structure of the A-domain of HMG1 and its interaction with DNA as studied by heteronuclear three- and four-dimensional NMR spectroscopy.

Hardman, C.H.Broadhurst, R.W.Raine, A.R.Grasser, K.D.Thomas, J.O.Laue, E.D.

(1995) Biochemistry 34: 16596-16607


  • PubMed Abstract: 
  • HMG1 has two homologous, folded DNA-binding domains ("HMG boxes"), A and B, linked by a short basic region to an acidic C-terminal domain. Like the whole protein, which may perform an architectural role in chromatin, the individual boxes bind to DNA ...

    HMG1 has two homologous, folded DNA-binding domains ("HMG boxes"), A and B, linked by a short basic region to an acidic C-terminal domain. Like the whole protein, which may perform an architectural role in chromatin, the individual boxes bind to DNA without sequence specificity, have a preference for distorted or prebent DNA, and are able to bend DNA and constrain negative superhelical turns. They show qualitatively similar properties with quantitative differences. We have previously determined the structure of the HMG box from the central B-domain (77 residues) by two-dimensional NMR spectroscopy, which showed that it contains a novel fold [Weir et al. (1993) EMBO J. 12, 1311-1319]. We have now determined the structure of the A-domain (as a Cys-->Ser mutant at position 22 to avoid oxidation, without effect on its DNA-binding properties or structure) using heteronuclear three- and four-dimensional NMR spectroscopy. The A-domain has a very similar global fold to the B-domain and the Drosophila protein HMG-D [Jones et al. (1994) Structure 2, 609-627]. There are small differences between A and B, in particular in the orientation of helix I, where the B-domain is more similar to HMG-D than it is to the A-domain; these differences may turn out to be related to the subtle differences in functional properties between the two domains [Teo et al. (1995) Eur. J. Biochem. 230, 943-950] and will be the subject of further investigation. NMR studies of the interaction of the A-domain of HMG1 with a short double-stranded oligonucleotide support the notion that the protein binds via the concave face of the L-shaped structure; extensive contacts with the DNA are made by the N-terminal extended strand, the N-terminus of helix I, and the C-terminus of helix II. These contacts are very similar to those seen in the LEF-1 and SRY-DNA complexes [Love et al. (1995) Nature 376, 791-795; Werner et al. (1995) Cell 81, 705-714].


    Related Citations: 
    • Backbone Dynamics of the a Domain of Hmg1 as Studied by 15N NMR Spectroscopy
      Broadhurst, R.W.,Hardman, C.H.,Thomas, J.O.,Laue, E.D.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Cambridge Centre for Molecular Recognition, Department of Biochemistry, University of Cambridge, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HIGH MOBILITY GROUP PROTEIN
A
83Rattus norvegicusMutation(s): 1 
Gene Names: Hmgb1 (Hmg-1, Hmg1)
Find proteins for P63159 (Rattus norvegicus)
Go to UniProtKB:  P63159
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 33 
  • Olderado: 1AAB Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-03-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance