This subproject is one of many research subprojects utilizing theresources provided by a Center grant funded by NIH/NCRR. The subproject andinvestigator (PI) may have received primary funding from another NIH source,and thus could be represented in other CRISP entries. The institution listed isfor the Center, which is not necessarily the institution for the investigator.This proposal focuses on the yeast C-type cyclin and the cyclin dependent kinase Cdk8. Cyclin C-Cdk8p binds the RNA polymerase II holoenzyme and represses both meiotic and stress response genes. To relieve this repression, cyclin C is destroyed thus uncovering a unique set of regulatory signals controlling cyclin turnover. We have found that the oxidative-stress induced destruction of cyclin C requires ubiquitin and the 26S proteasome. The focus of this study is to identify proteins that associate with cyclin C.
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