2b29
From Proteopedia
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'''N-terminal domain of the RPA70 subunit of human replication protein A.''' | '''N-terminal domain of the RPA70 subunit of human replication protein A.''' | ||
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[[Category: Milner, J.]] | [[Category: Milner, J.]] | ||
[[Category: Okorokov, A.]] | [[Category: Okorokov, A.]] | ||
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| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:45:39 2008'' | |
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Revision as of 16:45, 3 May 2008
N-terminal domain of the RPA70 subunit of human replication protein A.
Overview
One of many protein-protein interactions modulated upon DNA damage is that of the single-stranded DNA-binding protein, replication protein A (RPA), with the p53 tumor suppressor. Here we report the crystal structure of RPA residues 1-120 (RPA70N) bound to the N-terminal transactivation domain of p53 (residues 37-57; p53N) and, by using NMR spectroscopy, characterize two mechanisms by which the RPA/p53 interaction can be modulated. RPA70N forms an oligonucleotide/oligosaccharide-binding fold, similar to that previously observed for the ssDNA-binding domains of RPA. In contrast, the N-terminal p53 transactivation domain is largely disordered in solution, but residues 37-57 fold into two amphipathic helices, H1 and H2, upon binding with RPA70N. The H2 helix of p53 structurally mimics the binding of ssDNA to the oligonucleotide/oligosaccharide-binding fold. NMR experiments confirmed that both ssDNA and an acidic peptide mimicking a phosphorylated form of RPA32N can independently compete the acidic p53N out of the binding site. Taken together, our data suggest a mechanism for DNA damage signaling that can explain a threshold response to DNA damage.
About this Structure
2B29 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Single-stranded DNA mimicry in the p53 transactivation domain interaction with replication protein A., Bochkareva E, Kaustov L, Ayed A, Yi GS, Lu Y, Pineda-Lucena A, Liao JC, Okorokov AL, Milner J, Arrowsmith CH, Bochkarev A, Proc Natl Acad Sci U S A. 2005 Oct 25;102(43):15412-7. Epub 2005 Oct 17. PMID:16234232 Page seeded by OCA on Sat May 3 19:45:39 2008
