Download MendeleyTranscription Activator Structure Reveals Redox Control of a Replication Initiation Reaction.
Sanders, C.M., Sizov, D., Seavers, P.R., Ortiz-Lombardia, M., Antson, A.A.(2007) Nucleic Acids Res 35: 3504
- PubMed: 17478495
- DOI: https://doi.org/10.1093/nar/gkm166
- Primary Citation of Related Structures:
2JEU, 2JEX - PubMed Abstract:
Redox changes are one of the factors that influence cell-cycle progression and that control the processes of cellular proliferation, differentiation, senescence and apoptosis. Proteins regulated through redox-sensitive cysteines have been characterized but specific 'sulphydryl switches' in replication proteins remain to be identified. In bovine papillomavirus type-1, DNA replication begins when the viral transcription factor E2 recruits the viral initiator protein E1 to the origin of DNA replication (ori). Here we show that a novel dimerization interface in the E2 transcription activation domain is stabilized by a disulphide bond. Oxidative cross-linking via Cys57 sequesters the interaction surface between E1 and E2, preventing pre-initiation and replication initiation complex formation. Our data demonstrate that as well as a mechanism for regulating DNA binding, redox reactions can control replication by modulating the tertiary structure of critical protein factors using a specific redox sensor.
Organizational Affiliation:
Institute for Cancer Studies, University of Sheffield, Beech Hill Rd, Sheffield, S10 2RX, UK. c.m.sanders@sheffield.ac.uk
