Stoichiometric complex formation by proliferating cell nuclear antigen (PCNA) and its interacting protein: purification and crystallization of the DNA polymerase and PCNA monomer mutant complex from Pyrococcus furiosus

Acta Crystallographica. Section F, Structural Biology and Crystallization Communications
Hirokazu NishidaKosuke Morikawa

Abstract

Replicative DNA polymerase interacts with processivity factors, the beta-subunit of DNA polymerase III or proliferating cell nuclear antigen (PCNA), in order to function with a long template DNA. The archaeal replicative DNA polymerase from Pyrococcus furiosus interacts with PCNA via its PCNA-interacting protein (PIP) motif at the C-terminus. The PCNA homotrimeric ring contains one PIP interacting site on each monomer and since the ring can accommodate up to three molecules simultaneously, formation of a stable stoichiometric complex of PCNA with its interacting protein has been difficult to control in vitro. A stable complex of the DNA polymerase with PCNA, using a PCNA monomer mutant, has been purified and crystallized. The best ordered crystal diffracted to 3.0 A resolution using synchrotron radiation. The crystals belong to space group P2(1)2(1)2, with unit-cell parameters a = 225.3, b = 123.3, c = 91.3 A.

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Citations

Nov 26, 2009·Proceedings of the National Academy of Sciences of the United States of America·Hirokazu NishidaKosuke Morikawa
Sep 3, 2009·Acta Crystallographica. Section F, Structural Biology and Crystallization Communications·Miranda L Byrne-Steele, Joseph D Ng

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