Target of rapamycin complex 2 subunit MAPKAP1 is a protein that in humans is encoded by the MAPKAP1 gene. As the name indicates, it is a subunit of mTOR complex 2.

This gene encodes a protein that is highly similar to the yeast SIN1 protein, a stress-activated protein kinase. Alternatively spliced transcript variants encoding distinct isoforms have been described. Alternate polyadenylation sites as well as alternate 3' UTRs have been identified for transcripts of this gene.