p57 Antibody – Mouse Monoclonal

This gene is imprinted, with preferential expression of the maternal allele. The encoded protein is a tight-binding, strong inhibitor of several G1 cyclin/Cdk complexes and a negative regulator of cell proliferation. Mutations in this gene are implicated in sporadic cancers and Beckwith-Wiedemann syndorome, suggesting that this gene is a tumor suppressor candidate. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Oct 2010]

p57Kip2: Potent tight-binding inhibitor of several G1 cyclin/CDK complexes (cyclin E-CDK2, cyclin D2-CDK4, and cyclin A-CDK2) and, to lesser extent, of the mitotic cyclin B-CDC2. Negative regulator of cell proliferation. May play a role in maintenance of the non- proliferative state throughout life. Expressed in the heart, brain, lung, skeletal muscle, kidney, pancreas and testis. High levels are seen in the placenta while low levels are seen in the liver. Belongs to the CDI family. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: Cell cycle regulation; Inhibitor; Nuclear receptor co-regulator; Tumor suppressor

Chromosomal Location of Human Ortholog: 11p15.4

Cellular Component: cytoplasm; nucleus

Molecular Function: protein binding; protein complex binding; protein kinase inhibitor activity

Biological Process: negative regulation of epithelial cell proliferation; negative regulation of kinase activity; negative regulation of phosphorylation; negative regulation of transcription, DNA-dependent; positive regulation of transcription, DNA-dependent; positive regulation of transforming growth factor beta receptor signaling pathway

Disease: Beckwith-wiedemann Syndrome; Intrauterine Growth Retardation, Metaphyseal Dysplasia, Adrenal Hypoplasia Congenita, And Genital Anomalies