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[[Image:1pyi.gif|left|200px]]
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{{STRUCTURE_1pyi|  PDB=1pyi  |  SCENE=  }}  
{{STRUCTURE_1pyi|  PDB=1pyi  |  SCENE=  }}  


'''CRYSTAL STRUCTURE OF A PPR1-DNA COMPLEX: DNA RECOGNITION BY PROTEINS CONTAINING A ZN2CYS6 BINUCLEAR CLUSTER'''
===CRYSTAL STRUCTURE OF A PPR1-DNA COMPLEX: DNA RECOGNITION BY PROTEINS CONTAINING A ZN2CYS6 BINUCLEAR CLUSTER===




==Overview==
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PPR1 is a yeast transcription factor that contains a six-cysteine, two-zinc (Zn) domain, homologous to a similar structure in GAL4. Like GAL4, it binds to DNA sites with conserved CGG triplets symmetrically placed near each end. Whereas the GAL4 site has 11 intervening base pairs, the PPR1 site has 6. The crystal structure of a 95-residue fragment of PPR1 in specific complex with DNA shows that the protein binds to a symmetrical 14-bp recognition site as a nonsymmetrical homodimer. An amino-terminal Zn domain interacts with a conserved CGG triplet near each end of the site through major groove contacts, and the carboxy-terminal residues mediate dimerization through a coiled-coil element and an extended strand. A linker region, connecting the Zn domain and the coiled-coil, folds into a beta-hairpin. This hairpin packs differently on the two subunits and leads to a striking asymmetry, which is largely restricted to the dimerization and linker regions of the protein. Comparison with the GAL4-DNA structure shows that their specificities for sites of different length are determined by the preferred folds of their respective linker segments and by residues at the amino-terminal ends of their coiled-coils. None of these residues contact DNA in PPR1, and they contact only the sugar phosphate backbone in GAL4. We propose that this novel mode of DNA site selection is employed by other proteins that contain a Zn2Cys6 binuclear cluster.
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{{ABSTRACT_PUBMED_7958913}}


==About this Structure==
==About this Structure==
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[[Category: Marmorstein, R.]]
[[Category: Marmorstein, R.]]
[[Category: Protein-dna complex]]
[[Category: Protein-dna complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 15:28:22 2008''

Revision as of 12:28, 29 July 2008

File:1pyi.png

Template:STRUCTURE 1pyi

CRYSTAL STRUCTURE OF A PPR1-DNA COMPLEX: DNA RECOGNITION BY PROTEINS CONTAINING A ZN2CYS6 BINUCLEAR CLUSTER

Template:ABSTRACT PUBMED 7958913

About this Structure

1PYI is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Crystal structure of a PPR1-DNA complex: DNA recognition by proteins containing a Zn2Cys6 binuclear cluster., Marmorstein R, Harrison SC, Genes Dev. 1994 Oct 15;8(20):2504-12. PMID:7958913

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