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1adt
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(New page: 200px<br /><applet load="1adt" size="450" color="white" frame="true" align="right" spinBox="true" caption="1adt, resolution 2.6Å" /> '''EARLY E2A DNA-BINDING...)
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Revision as of 08:39, 20 November 2007
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EARLY E2A DNA-BINDING PROTEIN
Overview
The adenovirus single-stranded DNA binding protein (Ad DBP) is a, multifunctional protein required, amongst other things, for DNA, replication and transcription control. It binds to single- and, double-stranded DNA, as well as to RNA, in a sequence-independent manner., Like other single-stranded DNA binding proteins, it binds ssDNA, cooperatively. We report the crystal structure, at 2.6 A resolution, of, the nucleic acid binding domain. This domain is active in DNA replication., The protein contains two zinc atoms in different, novel coordinations. The, zinc atoms appear to be required for the stability of the protein fold, rather than being involved in direct contacts with the DNA. The crystal, structure shows that the protein contains a 17 amino acid C-terminal, extension which hooks onto a second molecule, thereby forming a protein, chain. Deletion of this C-terminal arm reduces cooperativity in DNA, binding, suggesting a hook-on model for cooperativity. Based on this, structural work and mutant studies, we propose that DBP forms a protein, core around which the single-stranded DNA winds.
About this Structure
1ADT is a Single protein structure of sequence from Human adenovirus 11 with ZN as ligand. Full crystallographic information is available from OCA.
Reference
Crystal structure of the adenovirus DNA binding protein reveals a hook-on model for cooperative DNA binding., Tucker PA, Tsernoglou D, Tucker AD, Coenjaerts FE, Leenders H, van der Vliet PC, EMBO J. 1994 Jul 1;13(13):2994-3002. PMID:8039495
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