FICD Polyclonal Antibody

Protein that can both mediate the addition of adenosine 5'-monophosphate (AMP to specific residues of target proteins (AMPylation, and the removal of the same modification from target proteins (de-AMPylation, depending on the context (By similarity. The side chain of Glu-231 determines which of the two opposing activities (AMPylase or de-AMPylase will take place (By similarity. Acts as a key regulator of the ERN1/IRE1-mediated unfolded protein response (UPR by mediating AMPylation or de-AMPylation of HSPA5/BiP. In unstressed cells, acts as an adenylyltransferase by mediating AMPylation of HSPA5/BiP at 'Thr-518', thereby inactivating it (By similarity. In response to endoplasmic reticulum stress, acts as a phosphodiesterase by mediating removal of ATP (de-AMPylation from HSPA5/BiP at 'Thr-518', leading to restore HSPA5/BiP activity (By similarity. Although it is able to AMPylate RhoA, Rac and Cdc42 Rho GTPases in vitro, Rho GTPases do not constitute physiological substrates.