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Sida 1 från 1815 resultat
Sequence and expression of caveolin, a protein component of caveolae plasma membrane domains phosphorylated on tyrosine in Rous sarcoma virus-transformed fibroblasts.
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Caveolae are flask-shaped plasma membrane invaginations abundant in endothelium and muscle but may be present in all cells. They contain a filamentous coat material thought to be important in their structure and function. Recent studies have demonstrated that a 22-kDa protein (caveolin)
Analysis of potential receptor tyrosine kinase targets in intimal and mural sarcomas.
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Primary sarcomas of the great vessels are very rare neoplasms and only a few cases have been reported. They are divided into the two broad categories of intimal or luminal and mural sarcomas. We analysed eight advanced high-grade sarcomas originating from major vessels (seven intimal and one mural
Detection of sarcoma virus family tyrosine kinase activity in coronary arterial tissue.
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We have observed that the tyrosine kinase inhibitors genistein and tyrphostin can selectively block angiotensin II mediated and vasopressin-mediated contractions in porcine coronary arterial strips, without affecting the action of acetylcholine. Therefore, we assessed the presence of tyrosine kinase
Phosphorylation of tyrosine residues of calmodulin in Rous sarcoma virus-transformed cells.
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Calmodulin, a wide-spread eukaryotic Ca2+-binding protein, was phosphorylated at its tyrosine residues in Rous sarcoma virus (RSV)-transformed chicken and rat cells but not in normal chicken embryo fibroblasts. In contrast, serine and threonine phosphorylation of calmodulin was found to occur in
Expression of functional tyrosine kinases on immortalized Kaposi's sarcoma cells.
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Kaposi's sarcoma (KS) is the most frequent malignant lesion in patients with AIDS and is characterized by spindle cell proliferation, inflammatory cell infiltration, angiogenesis, edema, and invasiveness. KS origin is still debated. The complex aspect of this disease is probably supported by
[Properties of tyrosine-specific protein kinase from rat sarcoma cells].
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A procedure for measuring the activity of tyrosine-specific protein kinases was developed. The method is based on the fact that the phosphoryl groups of phosphotyrosine residues of phosphorylated protein substrates are not hydrolyzed in alkaline solutions, whereas the phosphoserine and
Phosphorylation of talin at tyrosine in Rous sarcoma virus-transformed cells.
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The cytoskeletal protein talin was found to undergo enhanced phosphorylation at tyrosine residues in chicken embryo fibroblasts following transformation by Rous sarcoma virus. An increase in the tyrosine phosphorylation of talin was also observed within 6 h in cells infected by the
Enzymatic activation of Fujinami sarcoma virus gag-fps transforming proteins by autophosphorylation at tyrosine.
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Site-directed mutagenesis of the Fujinami sarcoma virus (FSV) genome has suggested that Tyr 1073 of the P130gag--fps protein-tyrosine kinase is a regulatory site. To investigate directly the ability of tyrosine phosphorylation to affect P130gag--fps kinase activity, the phosphotyrosyl phosphatase
Talin is phosphorylated on tyrosine in chicken embryo fibroblasts transformed by Rous sarcoma virus.
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We have examined the extent of tyrosine phosphorylation of talin, a component of the cytoskeleton localized in the focal adhesions and, therefore, a potential substrate of p60v-src, the transforming protein of Rous sarcoma virus. p60v-src is a tyrosine kinase that induces high levels of
A major site of tyrosine phosphorylation within the SH2 domain of Fujinami sarcoma virus P130gag-fps is not required for protein-tyrosine kinase activity or transforming potential.
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Phosphorylation of the major autophosphorylation site (Tyr-1073) within Fujinami sarcoma virus P130gag-fps activates both the intrinsic protein-tyrosine kinase activity and transforming potential of the protein. In this report, a second site of autophosphorylation Tyr-836 was identified. This
Mutagenesis of Fujinami sarcoma virus: evidence that tyrosine phosphorylation of P130gag-fps modulates its biological activity.
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The 130 kd transforming protein of Fujinami sarcoma virus (FSV P130gag -fps) possesses a tyrosine-specific protein kinase activity and is itself phosphorylated at several tyrosine and serine residues in FSV-transformed cells. We have used oligonucleotide-directed mutagenesis of the FSV genome to
Identification and characterization of tyrosine kinase activity associated with mitochondrial outer membrane in sarcoma 180 cells.
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Tyrosine protein kinase activity has been detected in the mitochondrial fraction purified from sarcoma 180 tumor cells. Following hypotonic disruption of mitochondria, tyrosine kinase activity appeared to cosediment with monamine oxidase, marker enzyme of mitochondrial outer membrane; meanwhile,
Tyrosine phosphorylation of a 22-kDa protein is correlated with transformation by Rous sarcoma virus.
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Recent studies from this laboratory have identified novel cytoskeletal proteins that are phosphorylated on tyrosine in vivo in Rous sarcoma virus-transformed chick fibroblasts (Glenney, J. R., Jr., and Zokas, L. (1989) J. Cell Biol. 108, 2401-2408). In the present report, the phosphorylation of
Tyrosine protein kinase activity of the HZ4-feline sarcoma virus P80gag-kit-transforming protein.
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The Hardy-Zuckerman 4 feline sarcoma virus (HZ4-FeSV), isolated from a feline fibrosarcoma, is a replication defective acute transforming feline retrovirus that originated by transduction of feline c-kit sequences with feline leukemia virus (FeLV). The v-kit sequences of the HZ4-FeSV, a segment of
Protein kinase activity of FSV (Fujinami sarcoma virus) P130gag-fps shows a strict specificity for tyrosine residues.
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A number of oncogenic viruses encode transforming proteins with protein kinase activities apparently specific for tyrosine residues. Recent evidence has raised questions as to the substrate specificity of these kinases in general and the physiological relevance of tyrosine phosphorylation in
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