3H4L

Crystal Structure of N terminal domain of a DNA repair protein

Summary for 3H4L

• Entry DOI: 10.2210/pdb3h4l/pdb
• Descriptor: DNA mismatch repair protein PMS1, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, MAGNESIUM ION, ... (4 entities in total)
• Functional Keywords: pms1, atp binding, dna repair, dna damage, nucleus, phosphoprotein, dna binding protein, protein binding
• Biological source: Saccharomyces cerevisiae (brewer's yeast,lager beer yeast,yeast)
• Cellular location: Nucleus: P14242
• Total number of polymer chains: 2
• Total formula weight: 83933.90

Authors

Arana, M.E.,Holmes, S.F.,Fortune, J.M.,Moon, A.F.,Pedersen, L.C.,Kunkel, T.A. (deposition date: 2009-04-20, release date: 2010-03-02, Last modification date: 2023-09-06)

Primary citation

Arana, M.E.,Holmes, S.F.,Fortune, J.M.,Moon, A.F.,Pedersen, L.C.,Kunkel, T.A.
Functional residues on the surface of the N-terminal domain of yeast Pms1.
Dna Repair, 9:448-457, 2010

PubMed Abstract: Saccharomyces cerevisiae MutLalpha is a heterodimer of Mlh1 and Pms1 that participates in DNA mismatch repair (MMR). Both proteins have weakly conserved C-terminal regions (CTDs), with the CTD of Pms1 harboring an essential endonuclease activity. These proteins also have conserved N-terminal domains (NTDs) that bind and hydrolyze ATP and bind to DNA. To better understand Pms1 functions and potential interactions with DNA and/or other proteins, we solved the 2.5A crystal structure of yeast Pms1 (yPms1) NTD. The structure is similar to the homologous NTDs of Escherichia coli MutL and human PMS2, including the site involved in ATP binding and hydrolysis. The structure reveals a number of conserved, positively charged surface residues that do not interact with other residues in the NTD and are therefore candidates for interactions with DNA, with the CTD and/or with other proteins. When these were replaced with glutamate, several replacements resulted in yeast strains with elevated mutation rates. Two replacements also resulted in NTDs with decreased DNA binding affinity in vitro, suggesting that these residues contribute to DNA binding that is important for mismatch repair. Elevated mutation rates also resulted from surface residue replacements that did not affect DNA binding, suggesting that these conserved residues serve other functions, possibly involving interactions with other MMR proteins.

PubMed: 20138591
DOI: 10.1016/j.dnarep.2010.01.010

Experimental method

X-RAY DIFFRACTION (2.5 Å)