View source for 1oqy

[[Image:1oqy.gif|left|200px]]

 {{Structure
|PDB= 1oqy |SIZE=350|CAPTION= <scene name='initialview01'>1oqy</scene>
|SITE= 
|LIGAND= 
|ACTIVITY= 
|GENE= RAD23A ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
}}

'''Structure of the DNA repair protein hHR23a'''


==Overview==
The Rad23 family of proteins, including the human homologs hHR23a and hHR23b, stimulates nucleotide excision repair and has been shown to provide a novel link between proteasome-mediated protein degradation and DNA repair. In this work, we illustrate how the proteasomal subunit S5a regulates hHR23a protein structure. By using NMR spectroscopy, we have elucidated the structure and dynamic properties of the 40-kDa hHR23a protein and show it to contain four structured domains connected by flexible linker regions. In addition, we reveal that these domains interact in an intramolecular fashion, and by using residual dipolar coupling data in combination with chemical shift perturbation analysis, we present the hHR23a structure. By itself, hHR23a adopts a closed conformation defined by the interaction of an N-terminal ubiquitin-like domain with two ubiquitin-associated domains. Interestingly, binding of the proteasomal subunit S5a disrupts the hHR23a interdomain interactions and thereby causes it to adopt an opened conformation.

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

==Reference==
DNA-repair protein hHR23a alters its protein structure upon binding proteasomal subunit S5a., Walters KJ, Lech PJ, Goh AM, Wang Q, Howley PM, Proc Natl Acad Sci U S A. 2003 Oct 28;100(22):12694-9. Epub 2003 Oct 13. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14557549 14557549]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Goh, A M.]]
[[Category: Howley, P M.]]
[[Category: Lech, P J.]]
[[Category: Walters, K J.]]
[[Category: Wang, Q.]]
[[Category: dna repair]]
[[Category: proteasome-mediated degradation]]
[[Category: protein-protein interaction]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:14:23 2008''