background:
In budding yeast, the Cdc14a phosphatase activates mitotic exit by dephosphorylation of specific cyclin-dependent kinase (Cdk) substrates and seems to be regulated by sequestration in the nucleolus until its release during mitosis. Human Cdc14a phosphatase is highly similar to Saccharomyces cerevisiae Cdc14 and is a member of the dual specificity protein Tyrosine phosphatase family. It interacts with and dephosphorylates tumor suppressor protein p53 and may regulate the function of p53. In addition, Cdc14a dephosphorylates hCdh1 and activates APCCdh1. Cdc14a phosphatase plays a role in the regulation of the centrosome cycle, mitosis and cytokinesis, thereby influencing chromosome partitioning and genomic stability in human cells. Deregulated human Cdc14a phosphatase disrupts centrosome separation and chromosome segregation.
Function:
Overproduction of hCdc14A leads to progressive cell death, accompanied by accumulation of pre-G1 DNA fragments and gradual elimination of cells at the G2/M transition. In 50% of the mitotic cells, multipolar mitotic spindles and misaggregated chromosomes are found. hCdc14A localizes to the centrosomes at the cell-cycle interphase stage. When the cell enters mitosis, this localization disappears suggesting that hCdc14A dissociates from the centrosomes at the G2/M transition. hCdc14A localizes to interphase centrosomes, but not to mitotic centrosomes, while hCdc14B localizes to the interphase nucleolus. Thus each isoform regulates separate cell cycle events. Cdc14A may affect cell cycle progression by its ability to dephosphorylate p53 at Ser315. This phosphatase activity is mediated by the interaction between the N-terminus of hCdc14A and the SLCterminus of p53.
Subunit:
Interacts with KIF20A, which is required to localize CDC14 to the midzone of the mitotic spindle.
Subcellular Location:
Nucleus. Cytoplasm, cytoskeleton, centrosome. Cytoplasm, cytoskeleton, spindle. Note=Centrosomal during interphase, released into the cytoplasm at the onset of mitosis. Subsequently localizes to the midzone of the mitotic spindle.
Tissue Specificity:
Widely expressed.
Similarity:
Belongs to the protein-tyrosine phosphatase family. Non-receptor class CDC14 subfamily.
Database links:
Entrez Gene: 8556 Human
Entrez Gene: 229776 Mouse
Entrez Gene: 310806 Rat
Omim: 603504 Human
SwissProt: Q9UNH5 Human
SwissProt: Q6GQT0 Mouse
Important Note:
This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications.
|
|
