Abstract
Pin1 is a unique peptidyl-prolyl cis/trans isomerase (PPIase) that catalyzes the cis/trans isomerization of peptidyl-prolyl peptide bonds of its substrate proteins by binding to their specific phosphorylated Ser/Thr-Pro (pSer/Thr-Pro) motifs. This alters the conformation of target proteins and consequently affects their stability, intracellular localization, and/or biological functions. The abnormal overexpression of Pin1 is observed in some malignancies, which is associated with cancer cell proliferation, migration and invasion. However, a role for Pin1 as a putative tumor suppressor has recently been suggested. Systematic dissection of pro-oncogenic vs. tumor suppressive functions of Pin1 will be necessary.
Keywords: Pin1, proline-directed protein kinases, phosphorylation-dependent peptidyl-prolyl isomerase, pSer/Thr-Pro motif, PPIase, proline isomerization.
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