PGRMC1 Antibody #12444

The progesterone receptor membrane component 1 (PGRMC1, Hpr6.6) was originally identified as a component of a progesterone-binding protein complex that also contains plasminogen activator inhibitor 1 RNA binding protein (PAIRBP1, SERBP1) (1,2). The structure of PGRMC1 protein includes a single transmembrane region and a carboxy-terminal cytochrome b5 heme-binding domain (3,4). Research studies confirm that PGRMC1 binds heme as well as binding and regulating cytochrome P450 enzymes responsible for the metabolism of clinical drugs and endogenous signaling molecules (5-7). While early research studies were equivocal on the ability of PGRMC1 to bind progesterone, studies using PGRMC1-fusion proteins clearly demonstrate that PGRMC1 binds progesterone with high affinity (2,8). Studies detailing expression of PGRMC1 in granulosa cells suggest that PGRMC1 mediates the anti-apoptotic actions of progesterone and that this protein is part of a signal transduction pathway that regulates granulosa cell function (9).