Protein-tyrosine Phosphatase DEP-1 Controls Receptor Tyrosine Kinase FLT3 Signaling

Expression of DEP-1, a receptor-like protein-tyrosine-phosphatase, is enhanced with increasing cell density.

cDNA encoding a receptor-like protein-tyrosine-phosphatase (PTP) termed DEP-1 was isolated from a HeLa cell library. The cDNA predicts an enzyme consisting of an extracellular segment containing eight fibronectin type III repeats, a single transmembrane segment, and a single intracellular PTP domain. Following expression of DEP-1 cDNA in COS cells a glycoprotein of 180 kDa was detected and PTP ...

Negative Regulation of Ros Receptor Tyrosine Kinase Signaling: An Epithelial Function of the SH2 Domain Protein Tyrosine Phosphatase SHP-1

Male “viable motheaten” ( me v ) mice, with a naturally occurring mutation in the gene of the SH2 domain protein tyrosine phosphatase SHP-1, are sterile. Known defects in sperm maturation in these mice correlate with an impaired differentiation of the epididymis, which has similarities to the phenotype of mice with a targeted inactivation of the Ros receptor tyrosine kinase. Ros and SHP-1 are c...

SHP1 tyrosine phosphatase negatively regulates NPM-ALK tyrosine kinase signaling.

Anaplastic large-cell lymphoma (ALCL) is frequently associated with the 2;5 translocation and expresses the NPM-ALK fusion protein, which possesses a constitutive tyrosine kinase activity. We analyzed SHP1 tyrosine phosphatase expression and activity in 3 ALK-positive ALCL cell lines (Karpas 299, Cost, and SU-DHL1) and in lymph node biopsies (n = 40). We found an inverse correlation between the...

Association of the Protein-Tyrosine Phosphatase DEP-1 with Its Substrate FLT3 Visualized by In Situ Proximity Ligation Assay

Protein-tyrosine phosphatases (PTPs) are important regulators of signal transduction processes. Essential for the functional characterization of PTPs is the identification of their physiological substrates, and an important step towards this goal is the demonstration of a physical interaction. The association of PTPs with their cellular substrates is, however, often transient and difficult to d...

PTPN 1 ( protein tyrosine phosphatase , non - receptor type 1 )