Download MendeleyCrystal Structure of the SF3 Helicase from Adeno-Associated Virus Type 2
James, J.A., Escalante, C.R., Yoon-Robarts, M., Edwards, T.A., Linden, R.M., Aggarwal, A.K.(2003) Structure 11: 1025-1035
- PubMed: 12906833
- DOI: https://doi.org/10.1016/s0969-2126(03)00152-7
- Primary Citation of Related Structures:
1S9H - PubMed Abstract:
We report here the crystal structure of an SF3 DNA helicase, Rep40, from adeno-associated virus 2 (AAV2). We show that AAV2 Rep40 is structurally more similar to the AAA(+) class of cellular proteins than to DNA helicases from other superfamilies. The structure delineates the expected Walker A and B motifs, but also reveals an unexpected "arginine finger" that directly implies the requirement of Rep40 oligomerization for ATP hydrolysis and helicase activity. Further, the Rep40 AAA(+) domain is novel in that it is unimodular as opposed to bimodular. Altogether, the structural connection to AAA(+) proteins defines the general architecture of SF3 DNA helicases, a family that includes simian virus 40 (SV40) T antigen, as well as provides a conceptual framework for understanding the role of Rep proteins during AAV DNA replication, packaging, and site-specific integration.
Organizational Affiliation:
Carl C. Icahn Center for Gene Therapy and Molecular Medicine, Mount Sinai School of Medicine, 1425 Madison Avenue, New York, NY 10029, USA.
