Anti-PLK1 (Marker of Mitosis) Monoclonal Antibody (Clone: AZ44)

Plk (for polo-like kinase) encodes a serine/threonine kinase that is closely related to polo and CDC5, genes that are required for passage throµgh mitosis in Drosophila and Saccharomyces, respectively. Polo and Cdc5 both code for proteins that are involved in regulating the function of the mitotic spindle. Plk protein accumulates in the cell during the S and G2 phases of the cell cycle, Plk protein content and catalytic activity peak at the onset of mitosis, followed by a rapid reduction after mitosis. Plk expression is detectable in mitotically active tissues such as colon and placenta, as well as in tumors of various origins. It has also been sµggested that Plk may serve as a marker of cell proliferation. Required for recovery after DNA damage checkpoint and entry into mitosis. Required for kinetochore localization of BUB1B. Phosphorylates SGOL1. Required for spindle pole localization of isoform 3 of SGOL1 and plays a role in regulating its centriole cohesion function. Phosphorylates BORA, and thereby promotes the degradation of BORA. Contributes to the regulation of AURKA function. Regulates TP53 stability throµgh phosphorylation of TOPORS. Useful for confirming that extracts have maintained CSF status and have not yet been activated into interphase. Protein function: Serine/threonine-protein kinase that performs several important functions throughout M phase of the cell cycle, including the regulation of centrosome maturation and spindle assembly, the removal of cohesins from chromosome arms, the inactivation of anaphase- promoting complex/cyclosome (APC/C) inhibitors, and the regulation of mitotic exit and cytokinesis. Polo-like kinase proteins acts by binding and phosphorylating proteins are that already phosphorylated on a specific motif recognized by the POLO box domains. Phosphorylates cdc25, pkmyt1/myt1, stag2/sa2, tpx2. Plays multiple essential roles during mitosis. Phosphorylates the N-terminal domain of cdc25, which leads to cyclin b-cdc2 activation and mitotic entry. Also required for organization of bipolar spindles, and for exit from mitosis. Involved in kinetochore functions and sister chromatid cohesion by phosphorylating stag2/sa2. [The UniProt Consortium]