1BW5

THE NMR SOLUTION STRUCTURE OF THE HOMEODOMAIN OF THE RAT INSULIN GENE ENHANCER PROTEIN ISL-1, 50 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 50 
  • Selection Criteria: LOW RESTRAINT ENERGY 

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This is version 1.3 of the entry. See complete history


Literature

The solution structure of the homeodomain of the rat insulin-gene enhancer protein isl-1. Comparison with other homeodomains.

Ippel, H.Larsson, G.Behravan, G.Zdunek, J.Lundqvist, M.Schleucher, J.Lycksell, P.O.Wijmenga, S.

(1999) J Mol Biol 288: 689-703

  • DOI: https://doi.org/10.1006/jmbi.1999.2718
  • Primary Citation of Related Structures:  
    1BW5

  • PubMed Abstract: 

    Homeodomains are one of the key families of eukaryotic DNA-binding motifs and provide an important model system for DNA recognition. We have determined a high-quality nuclear magnetic resonance (NMR) structure of the DNA-binding homeodomain of the insulin gene enhancer protein Isl-1 (Isl-1-HD). It forms the first solution structure of a homeodomain from the LIM family. It contains a well-defined inner core (residues 12-55) consisting of the classical three-helix structure observed in other homeodomains. The N terminus is unstructured up to residue 8, while the C terminus gradually becomes unstructured from residue 55 onwards. Some flexibility is evident in the loop parts of the inner core. Isl-1-HD has, despite its low sequence identity (23-34 %), a structure that is strikingly similar to that of the other homeodomains with known three-dimensional structures. Detailed analysis of Isl-1-HD and the other homeodomains rationalizes the differences in their temperature stability and explains the low stability of the Isl-1-HD in the free state (tm 22-30 degrees C). Upon DNA binding, a significant stabilization occurs (tm>55 degrees C). The low stability of Isl-1-HD (and other mammalian homeodomains) suggests that in vivo Isl-1-HD recognizes its cognate DNA from its unfolded state.


  • Organizational Affiliation

    Department of Medical Biochemistry and Biophysics, Umeâ University, Umeâ, S 901 87, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INSULIN GENE ENHANCER PROTEIN ISL-166Rattus norvegicusMutation(s): 0 
UniProt
Find proteins for P50480 (Rattus norvegicus)
Explore P50480 
Go to UniProtKB:  P50480
Entity Groups  
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UniProt GroupP50480
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 50 
  • Selection Criteria: LOW RESTRAINT ENERGY 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-06-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-16
    Changes: Database references, Derived calculations, Other, Structure summary