CycLex Protein Phosphatase Cdc25A,B,C Fluorometric Assay Kit is a
fluorometric and non-radioactive assay designed to measure the activity of
Cdc25A,B,C protein phosphatase.
Activation of cyclin-dependent kinases in higher eukaryotic cells can be achieved through dephosphorylation of two conserved residues, Thr14 and Tyr15 by members of the Cdc25 phosphatase family, Cdc25A, Cdc25B and Cdc25C. The Cdc25 dual-specificity phosphatases control progression through the eukaryotic cell division cycle by activating cyclin-dependent kinases. Cdc25A plays an important role at the G1/S-phase transition. Cdc25A degradation during mitotic exit and in early G1 is mediated by the anaphase-promoting complex or cyclosome (APC/C)(Cdh1) ligase, and that a KEN-box motif in the N-terminus of the protein is required for its targeted degradation. Cdc25B undergoes activation during S-phase and plays a role in activating the mitotic kinase Cdk1/cyclin B in the cytoplasm. Active Cdk1/cyclin B then phosphorylates and activates Cdc25C leading to a positive feedback mechanism and to entry into mitosis. In addition to their essential function in the normal cell cycle, cdc25 phosphatases are involved in the checkpoint-induced control of cell cycle progression. Finally, Cdc25A and B phosphatases have been shown to possess an important oncogenic potential and to be overexpressed in a variety of cancers and cancer cell lines.
Protein Phosphatase Cdc25A Fluorometric Assay Kit
Protein Phosphatase Cdc25B Fluorometric Assay Kit
Protein Phosphatase Cdc25C Fluorometric Assay Kit
Protein Phosphatase Cdc25 Combo Fluorometric Assay Kit
CycLex Protein Phosphatase LMW-PTP / ACP1 Fluorometric Assay Kit is a fluorometric and non-radioactive assay designed to measure the activity of LMW-PTP/ACP1 protein phosphatase.
The low molecular weight protein tyrosine phosphatase (LMW-PTP) is an 18-kDa cytosolic enzyme, also known as acidic protein phosphatase 1 (ACP1). LMW-PTP/ACP1 is specific for phosphotyrosine in peptides and proteins, but the enzyme shares very limited sequence homology with other PTPases. Recent studies suggested that entopic overexpression of LMW-PTP/ACP1 is sufficient to confer transformation in epithelial cells and its oncogenic activities required EphA2. LMW-PTP/ACP1 negatively regulates EphA2 receptor tyrosine kinase. LMW-PTP/ACP1 is a positive regulator of both tumor onset and development through ephrin- EphA2 signaling process, and it is a potential target of anticancer drug development.
CycLex PTP1B Fluorometric Assay Kit is a fluorometric and nonradioactive assay designed to measure the activity of protein tyrosine phosphatase, especially Protein Tyrosine Phosphatase 1B (PTP1B).
The protein-tyrosine phosphatase PTP1B, a ubiquitous, non-transmembrane protein tyrosine phosphatase, it is responsible for negatively regulating insulin signaling by dephosphorylating the phosphotyrosine residues of the insulin receptor kinase. On a high-fat diet, PTP1B-deficient mice were resistant to weight gain and remained insulin sensitive, while wild type mice rapidly gained weight and became insulin resistant. These results suggested a major role for PTP1B in modulation of insulin sensitivity and fuel metabolism, possibly involving PTP1B regulation of the leptin receptor pathway. Therefore it has been proposed that PTP1B is a potential therapeutic target for the treatment of type II diabetes and obesity.
CycLex DUSP1/MKP-1 Fluorometric Assay Kit is a fluorometric and nonradioactive
assay designed to measure the activity of DUSP1/MKP-1 protein phosphatase.
DUSP1 is a member of a family of dual-specificity phosphatases that dephosphorylate both phosphothreonine and phosphotyrosine residues and contain a highly conserved C-terminal catalytic domain and an N-terminal Cdc25-like (CH2) domain. DUSP1 is also known as MKP-1 (mitogenactivated protein (MAP) kinase phosphatase-1) and inactivates MAP kinase by the concomitant dephosphorylation of both its phosphothreonine and phosphotyrosine residues. The expression of DUSP1/MKP-1 is induced in human skin fibroblasts by oxidative/heat stress and growth factors. DUSP1/MKP-1 may play an important role in the human cellular response to environmental stress as well as in the negative regulation of cellular proliferation via the dephosphorylation of MAP kinase. A recent study also shows that DUSP1/MKP-1 is a key factor of major depressive disorder (MDD) and it may be a new drug targets for treating depression and possibly other mood disorders.
|Protein Tyrosine Phosphatase Recombinat Protein|
|Protein Tyrosine Phosphatase 1B(PTP1B) Positive Control|
|T Cell Protein Tyrosine Phosphatase (TCPTP) Positive Control|
|Protein Tyrosine Phosphatase PTPN3/PTPH1|
|Protein Tyrosine Phosphatase PTPN8/PTPN22|
|Protein Tyrosine Phosphatase PTPN9/MEG2|
|Protein Phosphatase DUSP1/MKP-1 (PTPN10)|
|Protein Tyrosine Phosphatase PTPN14/PEZ|
|Protein Tyrosine Phosphatase PTPN21/PTPD1|
|Protein Phosphatase Cdc25A|
|Protein Phosphatase Cdc25B|
|Protein Phosphatase Cdc25C|
|LMW-PTP/ACP1 Positive Control|
|Protein Phosphatase Cdi1/KAP|