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 1.2 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: 10.1006/jmbi.1999.2718

  • 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 in ...

    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.


    Related Citations: 
    • 1H, 13C and 15N Assignment of the Isl-1 Homeodomain
      Ippel, J.H.,Larsson, G.,Behravan, G.,Lundqvist, M.,Lycksell, P.O.,Schleucher, J.,Zdunek, J.,Wijmenga, S.S.
      (1998) J.Biomol.NMR 12: 357


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INSULIN GENE ENHANCER PROTEIN ISL-1
A
66Rattus norvegicusGene Names: Isl2 (Isl-2)
Find proteins for P50480 (Rattus norvegicus)
Go to UniProtKB:  P50480
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 50 
  • Selection Criteria: LOW RESTRAINT ENERGY 
  • Olderado: 1BW5 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-06-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance