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Site-specific proteolysis is an important biological mechanism for the regulation of cellular processes such as gene expression, cell signaling, development, and apoptosis. In transcriptional regulation, specific proteolysis regulates the localization and activity of many regulatory factors. The C1 factor (HCF), a cellular transcription factor and coactivator, undergoes site-specific proteolytic processing at a series of unusual amino acid reiterations to generate a family of amino- and carboxyl-terminal polypeptides that remain tightly associated. Expression and purification of bacterially expressed domains of the C1 factor identifies an autocatalytic activity that is responsible for the specific cleavage of the reiterations. In addition, coexpression of the autocatalytic domain with a heterologous protein containing a target cleavage site demonstrates that the C1 protease may also function in trans.

Autocatalytic proteolysis of the transcription factor-coactivator C1 (HCF): A potential role for proteolytic regulation of coactivator function