Download MendeleyA novel heterotetrameric structure of the crenarchaeal PCNA2-PCNA3 complex
Kawai, A., Hashimoto, H., Higuchi, S., Tsunoda, M., Sato, M., Nakamura, K.T., Miyamoto, S.(2011) J Struct Biol 174: 443-450
- PubMed: 21352919
- DOI: https://doi.org/10.1016/j.jsb.2011.02.006
- Primary Citation of Related Structures:
3AIX, 3AIZ - PubMed Abstract:
Proliferating cell nuclear antigen (PCNA) is a key protein that orchestrates the arrangement of DNA-processing proteins on DNA during DNA metabolism. In crenarchaea, PCNA forms a heterotrimer (PCNA123) consisting of PCNA1, PCNA2, and PCNA3, while in most eukaryotes and many archaea PCNAs form a homotrimer. Interestingly, unique oligomeric PCNAs from Sulfolobus tokodaii were reported in which PCNA2 and PCNA3 form a heterotrimer without PCNA1. In this paper, we describe the crystal structure of the stoPCNA2-stoPCNA3 complex. While most DNA sliding clamps form ring-shaped structures, our crystal structure showed an elliptic ring-like heterotetrameric complex, differing from a previous reports. Furthermore, we investigated the composition and the dimension of the stoPCNA2-stoPCNA3 complex in the solution using gel-filtration column chromatography and small-angle X-ray scattering analyses, respectively. These results indicate that stoPCNA2 and stoPCNA3 form the heterotetramer in solution. Based on our heterotetrameric structure, we propose a possible biological role for the heterotetrameric complex as a Holliday junction clamp.
Organizational Affiliation:
Sojo University, Ikeda, Kumamoto, Japan.
