1k8g: Difference between revisions

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[[Image:1k8g.gif|left|200px]]
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[[Image:1k8g.png|left|200px]]


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{{STRUCTURE_1k8g|  PDB=1k8g  |  SCENE=  }}  
{{STRUCTURE_1k8g|  PDB=1k8g  |  SCENE=  }}  


'''Crystal Structure of the N-terminal domain of Oxytricha nova telomere end binding protein alpha subunit both uncomplexed and complexed with telomeric ssDNA'''
===Crystal Structure of the N-terminal domain of Oxytricha nova telomere end binding protein alpha subunit both uncomplexed and complexed with telomeric ssDNA===




==Overview==
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Oxytricha nova telomere end-binding protein specifically recognizes and caps single strand (T(4)G(4))(n) telomeric DNA at the very 3'-ends of O. nova macronuclear chromosomes. Proteins homologous to the N-terminal domain of OnTEBP alpha subunit have now been identified in Oxytricha trifallax, Stylonychia mytilis, Euplotes crassus, Schizosaccharomyces pombe, and Homo sapiens, suggesting that this protein is widely distributed in eukaryotes. We describe here the crystal structures of the N-terminal single-stranded DNA (ssDNA)-binding domain of O. nova telomere end-binding protein alpha subunit both uncomplexed and complexed with single strand telomeric DNA. These structures show how the N-terminal domain of alpha alone, in the absence of the beta subunit and without alpha dimerization, can bind single-stranded telomeric DNA in a sequence-specific and 3'-end-specific manner. Furthermore, comparison of the uncomplexed and complexed forms of this protein shows that the ssDNA-binding site is largely pre-organized in the absence of ssDNA with modest, but interesting, rearrangements of amino acid side-chains that compose the ssDNA-binding site. The structures described here extend our understanding of structures of O. nova telomeric complexes by adding uncomplexed and complexed forms of monomeric alpha to previously described structures for (alpha 56/ssDNA)(2) dimer and alpha 56/beta 28/ssDNA ternary complexes. We believe that each of these four structures represent intermediates in an ordered assembly/disassembly pathway for O. nova telomeric complexes.
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{{ABSTRACT_PUBMED_11743727}}


==About this Structure==
==About this Structure==
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[[Category: Telomere end binding protein]]
[[Category: Telomere end binding protein]]
[[Category: Telomere]]
[[Category: Telomere]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:25:49 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 09:56:35 2008''

Revision as of 06:56, 2 July 2008

File:1k8g.png

Template:STRUCTURE 1k8g

Crystal Structure of the N-terminal domain of Oxytricha nova telomere end binding protein alpha subunit both uncomplexed and complexed with telomeric ssDNA

Template:ABSTRACT PUBMED 11743727

About this Structure

1K8G is a Single protein structure of sequence from Sterkiella nova. Full crystallographic information is available from OCA.

Reference

Crystal structure of the N-terminal domain of Oxytricha nova telomere end-binding protein alpha subunit both uncomplexed and complexed with telomeric ssDNA., Classen S, Ruggles JA, Schultz SC, J Mol Biol. 2001 Dec 14;314(5):1113-25. PMID:11743727

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