Sin1/MAPKAP1 Proteins and Enzymes

Sin1 is a novel component of the eukaryotic SAPK pathway. Sin1 and the H3 and H4 histones interact genetically, with the C terminus of Sin1 physically associating with components of the SWI-SNF complex. This interaction is blocked by the N-terminal half of the protein in full length Sin1. It has been proposed that Sin1 acts as a regulatable bridge between the SWI-SNF complex and the nucleosome Sin1 is also required for effective transcription via the AP-1 factor Pap1, but does not prevent its nuclear translocation. Sin1 is a novel component of the eukaryotic SAPK pathway.