Yeast substrate-trapping system for isolating substrates of protein tyrosine phosphatases: Isolation of substrates for protein tyrosine phosphatase receptor type z

Methods ◽  
2005 ◽  
Vol 35 (1) ◽  
pp. 54-63 ◽  
Author(s):  
M FUKADA ◽  
H KAWACHI ◽  
A FUJIKAWA ◽  
M NODA
Keyword(s):  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Receptor Type ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine

scholarly journals A RP-UFLC Assay for Protein Tyrosine Phosphatases: Focus on Protein Tyrosine Phosphatase Non-Receptor Type 2 (PTPN2)

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Romain Duval ◽  
Linh-Chi Bui ◽  
Jérémy Berthelet ◽  
Julien Dairou ◽  
Cécile Mathieu ◽  
...  
Keyword(s):  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Receptor Type ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine

scholarly journals Protein tyrosine phosphatase containing SH2 domains: characterization, preferential expression in hematopoietic cells, and localization to human chromosome 12p12-p13.

1992 ◽  
Vol 12 (2) ◽  
pp. 836-846 ◽  
Author(s):  
T L Yi ◽  
J L Cleveland ◽  
J N Ihle
Keyword(s):  
Tyrosine Phosphorylation ◽  
Protein Tyrosine Phosphatase ◽  
Human Gene ◽  
Tyrosine Phosphatase ◽  
Hematopoietic Cells ◽  
Protein Tyrosine Phosphatases ◽  
Hematopoietic Cell ◽  
Protein Tyrosine Phosphorylation ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine

Protein tyrosine phosphorylation has been implicated in the growth and functional responses of hematopoietic cells. Recently, approaches have been developed to characterize the protein tyrosine phosphatases that may contribute to regulation of protein tyrosine phosphorylation. One novel protein tyrosine phosphatase was expressed predominantly in hematopoietic cells. Hematopoietic cell phosphatase encodes a 68-kDa protein that contains a single phosphatase conserved domain. Unlike other known protein tyrosine phosphatases, hematopoietic cell phosphatase contains two src homology 2 domains. We also cloned the human homolog, which has 95% amino acid sequence identity. Both the murine and human gene products have tyrosine-specific phosphatase activity, and both are expressed predominantly in hematopoietic cells. Importantly, the human gene maps to chromosome 12 region p12-p13. This region is associated with rearrangements in approximately 10% of cases of acute lymphocytic leukemia in children.

scholarly journals Regulatory Functions of Protein Tyrosine Phosphatase Receptor Type O in Immune Cells

2021 ◽  
Vol 12 ◽  
Author(s):  
Feiling Xie ◽  
Hongmei Dong ◽  
Hao Zhang
Keyword(s):  
T Cells ◽  
B Cells ◽  
Immune Cells ◽  
Protein Tyrosine Phosphatase ◽  
Molecular Mechanisms ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Receptor Type ◽  
Protein Tyrosine ◽  
Cellular Processes

The members of the protein tyrosine phosphatase (PTP) family are key regulators in multiple signal transduction pathways and therefore they play important roles in many cellular processes, including immune response. As a member of PTP family, protein tyrosine phosphatase receptor type O (PTPRO) belongs to the R3 receptor-like protein tyrosine phosphatases. The expression of PTPRO isoforms is tissue-specific and the truncated PTPRO (PTPROt) is mainly observed in hematopoietic cells, including B cells, T cells, macrophages and other immune cells. Therefore, PTPROt may play an important role in immune cells by affecting their growth, differentiation, activation and immune responses. In this review, we will focus on the regulatory roles and underlying molecular mechanisms of PTPRO/PTPROt in immune cells, including B cells, T cells, and macrophages.

scholarly journals Sulfonyl-bridged Calix[4]arene as an Inhibitor of Protein Tyrosine Phosphatases

2017 ◽  
Vol 5 (2) ◽  
pp. 144-151 ◽  
Author(s):  
Vladyslav Buldenko ◽  
Oleksandr Kobzar ◽  
Viacheslav Trush ◽  
Andriy Drapailo ◽  
Vitaly Kalchenko ◽  
...  
Keyword(s):  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine ◽  
Ic50 Value ◽  
Potential Inhibitors ◽  
Derivatives Of ◽  
Active Site Region ◽  
Micromolar Range

Previously, phosphonic acid derivatives of calix[4]arene and thiacalix[4]arene were found to be potential inhibitors of protein tyrosine phosphatase 1B. In the present paper, the inhibitory activity of unsubstituted sulfonyl-bridget calix[4]arene towards some of the therapeutically important protein tyrosine phosphatases has been established. The obtained results showed that the sulfonylcalix[4]arene is able to inhibit protein tyrosine phosphatase MEG2 with IC50 value in the micromolar range. At the same time, the inhibitor demonstrated lower activity in case of other protein tyrosine phosphatases such as PTP1B, MEG1, TC-PTP, SHP2, and PTPβ. The performed molecular docking indicated that the inhibitor binds to the active site region of MEG2 and PTP1B with WPD-loop in the open conformation.

SRC binding to the cytoskeleton, triggered by growth cone attachment to laminin, is protein tyrosine phosphatase-dependent

1998 ◽  
Vol 111 (16) ◽  
pp. 2465-2475 ◽  
Author(s):  
S. Helmke ◽  
K. Lohse ◽  
K. Mikule ◽  
M.R. Wood ◽  
K.H. Pfenninger
Keyword(s):  
Phosphatase Activity ◽  
Growth Cone ◽  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Growth Cones ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine ◽  
Adhesion Sites ◽  
Adhesion Site

The interaction of the non-receptor tyrosine kinase, Src, with the cytoskeleton of adhesion sites was studied in nerve growth cones isolated from fetal rat brain. Of particular interest was the role of protein tyrosine phosphatases in the regulation of Src-cytoskeleton binding. Growth cones were found to contain a high level of protein tryrosine phosphatase activity, most of it membrane-associated and forming large, multimeric and wheat germ agglutinin-binding complexes. The receptor tyrosine phosphatase PTPalpha seems to be the most prevalent species among the membrane-associated enzymes. As seen by immunofluorescence, PTPalpha is present throughout the plasmalemma of the growth cone including filopodia, and it forms a punctate pattern consistent with that of integrin beta1. For adhesion site analysis, isolated growth cones were either plated onto the neurite growth substratum, laminin, or kept in suspension. Plating growth cones on laminin triggered an 8-fold increase in Src binding to the adherent cytoskeleton. This effect was blocked completely with the protein tyrosine phosphatase inhibitor, vanadate. Growth cone plating also increased the association with adhesion sites of tyrosine phosphatase activity (14-fold) and of PTPalpha immunoreactivity (6-fold). Vanadate blocked the enzyme activity but not the recruitment of PTPalpha to the adhesion sites. In conjunction with our previous results on growth cones, these data suggest that integrin binding to laminin triggers the recruitment of PTPalpha (and perhaps other protein tyrosine phosphatases) to adhesion sites, resulting in de-phosphorylation of Src's tyr 527. As a result Src unfolds, becomes kinase-active, and its SH2 domain can bind to an adhesion site protein. This implies a critical role for protein tyrosine phosphatase activity in the earliest phases of adhesion site assembly.

Protein tyrosine phosphatase containing SH2 domains: characterization, preferential expression in hematopoietic cells, and localization to human chromosome 12p12-p13

1992 ◽  
Vol 12 (2) ◽  
pp. 836-846
Author(s):  
T L Yi ◽  
J L Cleveland ◽  
J N Ihle
Keyword(s):  
Tyrosine Phosphorylation ◽  
Protein Tyrosine Phosphatase ◽  
Human Gene ◽  
Tyrosine Phosphatase ◽  
Hematopoietic Cells ◽  
Protein Tyrosine Phosphatases ◽  
Hematopoietic Cell ◽  
Protein Tyrosine Phosphorylation ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine

Protein tyrosine phosphorylation has been implicated in the growth and functional responses of hematopoietic cells. Recently, approaches have been developed to characterize the protein tyrosine phosphatases that may contribute to regulation of protein tyrosine phosphorylation. One novel protein tyrosine phosphatase was expressed predominantly in hematopoietic cells. Hematopoietic cell phosphatase encodes a 68-kDa protein that contains a single phosphatase conserved domain. Unlike other known protein tyrosine phosphatases, hematopoietic cell phosphatase contains two src homology 2 domains. We also cloned the human homolog, which has 95% amino acid sequence identity. Both the murine and human gene products have tyrosine-specific phosphatase activity, and both are expressed predominantly in hematopoietic cells. Importantly, the human gene maps to chromosome 12 region p12-p13. This region is associated with rearrangements in approximately 10% of cases of acute lymphocytic leukemia in children.

scholarly journals Bracoviruses Contain a Large Multigene Family Coding for Protein Tyrosine Phosphatases

2004 ◽  
Vol 78 (23) ◽  
pp. 13090-13103 ◽  
Author(s):  
Bertille Provost ◽  
Paola Varricchio ◽  
Eloisa Arana ◽  
Eric Espagne ◽  
Patrizia Falabella ◽  
...  
Keyword(s):  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine ◽  
Lepidopteran Larvae ◽  
Conserved Genes ◽  
Ancestral Virus ◽  
Phylogenetic Origin ◽  
Braconid Wasp

ABSTRACT The relationship between parasitic wasps and bracoviruses constitutes one of the few known mutualisms between viruses and eukaryotes. The virions produced in the wasp ovaries are injected into host lepidopteran larvae, where virus genes are expressed, allowing successful development of the parasite by inducing host immune suppression and developmental arrest. Bracovirus-bearing wasps have a common phylogenetic origin, and contemporary bracoviruses are hypothesized to have been inherited by chromosomal transmission from a virus that originally integrated into the genome of the common ancestor wasp living 73.7 ± 10 million years ago. However, so far no conserved genes have been described among different braconid wasp subfamilies. Here we show that a gene family is present in bracoviruses of different braconid wasp subfamilies (Cotesia congregata, Microgastrinae, and Toxoneuron nigriceps, Cardiochilinae) which likely corresponds to an ancient component of the bracovirus genome that might have been present in the ancestral virus. The genes encode proteins belonging to the protein tyrosine phosphatase family, known to play a key role in the control of signal transduction pathways. Bracovirus protein tyrosine phosphatase genes were shown to be expressed in different tissues of parasitized hosts, and two protein tyrosine phosphatases were produced with recombinant baculoviruses and tested for their biochemical activity. One protein tyrosine phosphatase is a functional phosphatase. These results strengthen the hypothesis that protein tyrosine phosphatases are involved in virally induced alterations of host physiology during parasitism.

scholarly journals Regulation of membrane-associated tyrosine phosphatases in UMR 106.06 osteoblast-like cells

1995 ◽  
Vol 305 (2) ◽  
pp. 485-490 ◽  
Author(s):  
M C Southey ◽  
D M Findlay ◽  
B E Kemp
Keyword(s):  
Growth Factor ◽  
Molecular Mass ◽  
Phosphatase Activity ◽  
Cell Density ◽  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Protein Tyrosine Phosphatases ◽  
Apparent Molecular Mass ◽  
Tyrosine Phosphatases ◽  
Protein Tyrosine

Protein tyrosine phosphatases play an important role in cell metabolism. Three distinct protein tyrosine phosphatase activities have been identified in an osteoblast-like cell line, UMR 106.06. These activities comprised two membrane-associated phosphatases and one cytosolic phosphatase of apparent molecular mass > 153 kDa, 80 kDa and 40 kDa respectively, estimated by gel filtration. On the basis of differences in apparent molecular mass, proteolytic-digestion profiles, substrate specificities and responses to a range of extracellular influences and inhibitor molecules, the two membrane-associated tyrosine phosphatases are distinct proteins. Tyrosine phosphatase activity in UMR 106.06 cells was sensitive to cell density. Cells at confluence contained membrane protein tyrosine phosphatase with specific activity 9-fold higher than cells at medium or low cell density. This elevation in membrane tyrosine phosphatase activity was due specifically to an increase in the high-molecular-mass enzyme. This phosphatase was also responsive to extracellular matrix components. This activity was elevated in cells grown on a collagen type-I matrix independently of cell density. Membrane and cytosolic protein tyrosine phosphatases were differentially regulated by a variety of agents including phorbol 12-myristate 13-acetate, parathyroid hormone, epidermal growth factor, okadaic acid and transforming growth factor beta. These observations suggest that regulatory influences control tyrosine phosphorylation in UMR 106.06 cells including cell-cell contact, cell-matrix contact and signal transduction involving tyrosine and serine/threonine phosphorylation events.

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