Article

Lee MH, Reynisdottir I, Massague J.. Cloning of p57KIP2, a cyclin-dependent kinase inhibitor with unique domain structure and tissue distribution. Genes Dev 9: 639-649

Cell Biology and Genetics Program, Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
Genes & Development (Impact Factor: 10.8). 04/1995; 9(6):639-49. DOI: 10.1101/gad.9.6.639
Source: OAI

ABSTRACT

Progression through the cell cycle is catalyzed by cyclin-dependent kinases (CDKs) and is negatively controlled by CDK inhibitors (CDIs). We have isolated a new member of the p21CIP1/p27KIP1 CDI family and named it p57KIP2 to denote its apparent molecular mass and higher similarity to p27KIP1. Three distinct p57 cDNAs were cloned that differ at the start of their open reading frames and correspond to messages generated by the use of distinct splice acceptor sites. p57 is distinguished from p21 and p27 by its unique domain structure. Four distinct domains follow the heterogeneous amino-terminal region and include, in order, a p21/p27-related CDK inhibitory domain, a proline-rich (28% proline) domain, an acidic (36% glutamic or aspartic acid) domain, and a carboxy-terminal nuclear targeting domain that contains a putative CDK phosphorylation site and has sequence similarity to p27 but not to p21. Most of the acidic domain consists of a novel, tandemly repeated 4-amino acid motif. p57 is a potent inhibitor of G1- and S-phase CDKs (cyclin E-cdk2, cyclin D2-cdk4, and cyclin A-cdk2) and, to lesser extent, of the mitotic cyclin B-Cdc2. In mammalian cells, p57 localizes to the nucleus, associates with G1 CDK components, and its overexpression causes a complete cell cycle arrest in G1 phase. In contrast to the widespread expression of p21 and p27 in human tissues, p57 is expressed in a tissue-specific manner, as a 1.5-kb species in placenta and at lower levels in various other tissues and a 7-kb mRNA species observed in skeletal muscle and heart. The expression pattern and unique domain structure of p57 suggest that this CDI may play a specialized role in cell cycle control.

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    • "CEBPB and CDC20 elevation indicates the inhibition of proliferation[35,36]. Interestingly, increased CDC20 levels, which are counteracted by the similar increase in anaphase inhibitor SECURIN, a molecule preventing cells from metaphase to anaphase transition[37]. CDKN1C regulates apoptosis, cell invasion and metastasis is also highly increased to promote cellular arrest[38]. Similarly, all the genes involved in p53 pathway are significantly downregulated via the KEGG analysis. "
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    • "Also, p27 has the capacity to arrest cells in G2 (Niculescu et al., 1998). p57 (Kip2) inhibits cyclin A-and E-associated CDKs and therefore regulates G1/S transition and completion of S phase (Lee et al., 1995) and is primarily expressed in terminally differentiated cells (Yan et al., 1997). IUGR is a major cause of perinatal death and neonatal morbidity and mortality. "
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    • "The p57Kip2 protein (abbreviated as p57) is a member of p21Cip1/p27Kip1 CDI family, sharing similar sequence with p27Kip1, also known as CDKN1C. Its overexpression causes a complete cell cycle arrest in G1 phase [42]. Decreased expression of p57 has been found in many types of cancer, including bladder carcinoma, gastric cancer and pancreatic cancer [43]. "
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