2alc
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(New page: 200px<br /><applet load="2alc" size="450" color="white" frame="true" align="right" spinBox="true" caption="2alc" /> '''ETHANOL REGULON TRANSCRIPTIONAL ACTIVATOR DN...)
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Revision as of 06:05, 21 November 2007
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ETHANOL REGULON TRANSCRIPTIONAL ACTIVATOR DNA-BINDING DOMAIN FROM ASPERGILLUS NIDULANS
Overview
The three-dimensional structure of the DNA-binding domain (residues 1-60), of the ethanol regulon transcription factor AlcR from Aspergillus nidulans, has been solved by NMR. This domain belongs to the zinc binuclear cluster, class. Although the core of the protein is similar to previously, characterized structures, consisting of two helices organized around a, Zn(2)Cys(6 )motif, the present structure presents important variations, among them the presence of two supplementary helices. This structure gives, new insight into the understanding of the AlcR specificities in DNA, binding such as longer consensus half-sites, in vitro monomeric binding, but in vivo multiple repeat transcriptional activation, either in direct, or inverse orientations. The presence of additional contacts of the, protein with its DNA target can be predicted from a model proposed for the, interaction with the consensus DNA target. The clustering of accessible, negative charges on helix 2 delineates a possible interaction site for, other determinants of the transcriptional machinery, responsible for the, fine tuning of the selection of the AlcR cognate sites.
About this Structure
2ALC is a Single protein structure of sequence from Emericella nidulans with ZN as ligand. Full crystallographic information is available from OCA.
Reference
NMR solution structure of AlcR (1-60) provides insight in the unusual DNA binding properties of this zinc binuclear cluster protein., Cerdan R, Cahuzac B, Felenbok B, Guittet E, J Mol Biol. 2000 Jan 28;295(4):729-36. PMID:10656785
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