1p7a: Difference between revisions

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[[Image:1p7a.gif|left|200px]]
{{Seed}}
[[Image:1p7a.png|left|200px]]


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{{STRUCTURE_1p7a|  PDB=1p7a  |  SCENE=  }}  
{{STRUCTURE_1p7a|  PDB=1p7a  |  SCENE=  }}  


'''Solution Stucture of the Third Zinc Finger from BKLF'''
===Solution Stucture of the Third Zinc Finger from BKLF===




==Overview==
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Classical (CCHH) zinc fingers are among the most common protein domains found in eukaryotes. They function as molecular recognition elements that mediate specific contact with DNA, RNA, or other proteins and are composed of a betabetaalpha fold surrounding a single zinc ion that is ligated by two cysteine and two histidine residues. In a number of variant zinc fingers, the final histidine is not conserved, and in other unrelated zinc binding domains, residues such as aspartate can function as zinc ligands. To test whether the final histidine is required for normal folding and the DNA-binding function of classical zinc fingers, we focused on finger 3 of basic Kruppel-like factor. The structure of this domain was determined using NMR spectroscopy and found to constitute a typical classical zinc finger. We generated a panel of substitution mutants at the final histidine in this finger and found that several of the mutants retained some ability to fold in the presence of zinc. Consistent with this result, we showed that mutation of the final histidine had only a modest effect on DNA binding in the context of the full three-finger DNA-binding domain of basic Kruppel-like factor. Further, the zinc binding ability of one of the point mutants was tested and found to be indistinguishable from the wild-type domain. These results suggest that the final zinc chelating histidine is not an essential feature of classical zinc fingers and have implications for zinc finger evolution, regulation, and the design of experiments testing the functional roles of these domains.
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{{ABSTRACT_PUBMED_12736264}}


==About this Structure==
==About this Structure==
1P7A is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P7A OCA].  
1P7A is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P7A OCA].  


==Reference==
==Reference==
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[[Category: Kruppel-like]]
[[Category: Kruppel-like]]
[[Category: Transcription factor]]
[[Category: Transcription factor]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 04:46:22 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 20:21:35 2008''

Revision as of 17:21, 27 July 2008

File:1p7a.png

Template:STRUCTURE 1p7a

Solution Stucture of the Third Zinc Finger from BKLF

Template:ABSTRACT PUBMED 12736264

About this Structure

1P7A is a Single protein structure of sequence from Mus musculus. Full experimental information is available from OCA.

Reference

CCHX zinc finger derivatives retain the ability to bind Zn(II) and mediate protein-DNA interactions., Simpson RJ, Cram ED, Czolij R, Matthews JM, Crossley M, Mackay JP, J Biol Chem. 2003 Jul 25;278(30):28011-8. Epub 2003 May 7. PMID:12736264

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