1bw5: Difference between revisions

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[[Image:1bw5.gif|left|200px]]
{{Seed}}
[[Image:1bw5.png|left|200px]]


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{{STRUCTURE_1bw5|  PDB=1bw5  |  SCENE=  }}  
{{STRUCTURE_1bw5|  PDB=1bw5  |  SCENE=  }}  


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




==Overview==
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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&gt;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.
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{{ABSTRACT_PUBMED_10329173}}


==About this Structure==
==About this Structure==
1BW5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BW5 OCA].  
1BW5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BW5 OCA].  


==Reference==
==Reference==
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[[Category: Homeodomain]]
[[Category: Homeodomain]]
[[Category: Lim domain]]
[[Category: Lim domain]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 12:01:31 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 19:48:39 2008''

Revision as of 16:48, 30 June 2008

File:1bw5.png

Template:STRUCTURE 1bw5

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

Template:ABSTRACT PUBMED 10329173

About this Structure

1BW5 is a Single protein structure of sequence from Rattus norvegicus. Full experimental information is available from OCA.

Reference

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 PO, Wijmenga S, J Mol Biol. 1999 May 14;288(4):689-703. PMID:10329173

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