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Mantelingu K, Reddy BAA, Swaminathan V, Kishore AH, Siddappa NB, Kumar GVP, Nagashankar G, Natesh N, Roy S, Sadhale PP, Ranga U, Narayana C, Kundu TK. Specific inhibition of p300-HAT alters global gene expression and represses HIV replication. ACTA ACUST UNITED AC 2007; 14:645-57. [PMID: 17584612 DOI: 10.1016/j.chembiol.2007.04.011] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Revised: 04/18/2007] [Accepted: 04/23/2007] [Indexed: 12/01/2022]
Abstract
Reversible acetylation of histone and nonhistone proteins plays pivotal role in cellular homeostasis. Dysfunction of histone acetyltransferases (HATs) leads to several diseases including cancer, neurodegenaration, asthma, diabetes, AIDS, and cardiac hypertrophy. We describe the synthesis and characterization of a set of p300-HAT-specific small-molecule inhibitors from a natural nonspecific HAT inhibitor, garcinol, which is highly toxic to cells. We show that the specific inhibitor selectively represses the p300-mediated acetylation of p53 in vivo. Furthermore, inhibition of p300-HAT down regulates several genes but significantly a few important genes are also upregulated. Remarkably, these inhibitors were found to be nontoxic to T cells, inhibit histone acetylation of HIV infected cells, and consequently inhibit the multiplication of HIV.
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Affiliation(s)
- K Mantelingu
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore, India
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2
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Huang J, Sakai R, Furuichi T. The docking protein Cas links tyrosine phosphorylation signaling to elongation of cerebellar granule cell axons. Mol Biol Cell 2006; 17:3187-96. [PMID: 16687575 PMCID: PMC1483050 DOI: 10.1091/mbc.e05-12-1122] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Crk-associated substrate (Cas) is a tyrosine-phosphorylated docking protein that is indispensable for the regulation of the actin cytoskeletal organization and cell migration in fibroblasts. The function of Cas in neurons, however, is poorly understood. Here we report that Cas is dominantly enriched in the brain, especially the cerebellum, of postnatal mice. During cerebellar development, Cas is highly tyrosine phosphorylated and is concentrated in the neurites and growth cones of granule cells. Cas coimmunoprecipitates with Src family protein tyrosine kinases, Crk, and cell adhesion molecules and colocalizes with these proteins in granule cells. The axon extension of granule cells is inhibited by either RNA interference knockdown of Cas or overexpression of the Cas mutant lacking the YDxP motifs, which are tyrosine phosphorylated and thereby interact with Crk. These findings demonstrate that Cas acts as a key scaffold that links the proteins associated with tyrosine phosphorylation signaling pathways to the granule cell axon elongation.
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Affiliation(s)
- Jinhong Huang
- *Laboratory for Molecular Neurogenesis, Riken Brain Science Institute, Wako, Saitama 351-0198; and
| | - Ryuichi Sakai
- Growth Factor Division, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan
| | - Teiichi Furuichi
- *Laboratory for Molecular Neurogenesis, Riken Brain Science Institute, Wako, Saitama 351-0198; and
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Martins-Green M, Bixby JL, Yamamoto T, Graf T, Sudol M. Tissue specific expression of Yrk kinase: implications for differentiation and inflammation. Int J Biochem Cell Biol 2000; 32:351-64. [PMID: 10716632 DOI: 10.1016/s1357-2725(99)00118-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Src family of proto-oncogenes is a highly conserved group of non-receptor tyrosine kinases with very similar, but not identical, tissue distributions and functions. Yrk is a recently discovered new member of this family. Here we report the patterns of expression of this kinase in a variety of chicken tissues during development and after hatching, and experiments that correlate some of the observed patterns of expression with potential functions. The results show that the Yrk protein is primarily found in neuronal and epithelial cells and in monocyte/macrophages. In neuronal tissues of hatched chicks, Yrk is expressed in Purkinje cells, in the gigantocellularis of the brain-stem, and in retinal ganglion cells. In addition, staining for this kinase is also seen as thread-like and punctate patterns suggesting staining in neurites and growth cones. Epithelial cells express Yrk in the stomach during late developmental stages and after hatching but, in other epithelia such as in the peridermis, intestine and kidney, expression is high during development but low (skin) or undetectable (intestine and kidney) after hatching. These results suggest that Yrk may have several functional roles, specifically in cell migration and or differentiation during neuronal and epithelial cell development and in maintenance of the differentiated phenotype. In this study we also show that significant levels of Yrk are detected in monocytes of the blood and in tissue macrophages. Analysis of chicken hematopoietic cell lines confirmed the expression of Yrk in cells of monocyte/macrophage lineage and show for the first time in experimentally-induced inflammation that Yrk kinase activity is high during the period of monocyte infiltration, raising the possibility that this kinase plays a role in inflammation and/or response to injury.
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Affiliation(s)
- M Martins-Green
- Department of Cell Biology and Neurosciences, University of California, Riverside 92521, USA.
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Affiliation(s)
- A R Boxall
- Cruciform Project, University College London, UK
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Kawakatsu H, Sakai T, Takagaki Y, Shinoda Y, Saito M, Owada MK, Yano J. A new monoclonal antibody which selectively recognizes the active form of Src tyrosine kinase. J Biol Chem 1996; 271:5680-5. [PMID: 8621432 DOI: 10.1074/jbc.271.10.5680] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Phosphorylation and dephosphorylation of Tyr-530 in human c-Src (Tyr-527 in avian c-Src) is critical in regulating c-Src kinase activity. So far, it has not been possible to distinguish the active and inactive forms in vivo. We now report a new monoclonal antibody that selectively recognizes the active form of c-Src. This antibody, termed clone 28, recognized a region adjacent to Tyr-530 (Q529YQP532) in the C-terminal regulatory domain of c-Src, and its binding was hindered by phosphorylation of this tyrosine as determined by peptide competition assay. Combined immunoprecipitation/Western blotting revealed that clone 28 reacted with a 60-kDa protein that was precipitated by mAb 327, a well known monoclonal antibody against v-Src and c-Src. Cyanogen bromide cleavage and two-dimensional tryptic maps confirmed that clone 28 was specific for the active form (Tyr-530 not phosphorylated), whereas mAb 327 recognized the inactive form (Tyr-530 phosphorylated) as well as the active form. Clone 28 selectively immunoprecipitated the active form and augmented its kinase activity. Preabsorption experiments revealed that clone 28 could not completely immunoprecipitate the mAb 327 binding 60-kDa protein in either an in vitro or an in vivo phosphorylation system. These observations, taken together, strongly suggest the existence of multiple forms of c-Src as proposed by Cooper and Howell (1993) (Cooper, J. A., and Howell, B. (1993) Cell 73, 1051-1054). Using clone 28, we demonstrated a distinct localization of the active form of c-Src within cultured normal fibroblast cells. In liver tissue sections, we also examined the distribution of the active form in embryonic mice. Megakaryocytes were strongly stained, in contrast to completely negative immunoreactivity in hepatocytes, reticulocytes, and granulocytes. This result provides the first direct evidence that c-Src is highly activated in platelets.
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Affiliation(s)
- H Kawakatsu
- Molecular Biology Department, Research Laboratories, Nippon Shinyaku Co. Ltd., 601 Kyoto, Japan
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Zhao DM, Tateyama S, Miyoshi N, Uchida K, Yamaguchi R, Yamagami T, Hayashi T. Sequence of the canine c-yes proto-oncogene. Res Vet Sci 1995; 59:230-3. [PMID: 8588097 DOI: 10.1016/0034-5288(95)90008-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Cloning of the canine yes oncogene was attempted from a cDNA library derived from a healthy canine spleen using a human c-yes-1 probe. The nucleotide and amino acid sequences revealed that the canine yes gene contained an open reading frame consisting of 539 amino acids. Its product had a molecular mass of 60,368 Daltons and showed 95.9 per cent and 90.4 per cent homology with human and chick p61c-yes, respectively. Moreover, the product had a myristylation signal, src homology region (SH) 3, SH2, and tyrosine kinase domains showing 98.8 per cent and 96.0 per cent homology with those of human beings and chickens, respectively. These findings indicate that the products of the canine yes gene may have non-receptor-type tyrosine kinase activity on the cell membrane, as is the case in human and chick p61c-yes.
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Affiliation(s)
- D M Zhao
- Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Japan
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Sudol M, Chen HI, Bougeret C, Einbond A, Bork P. Characterization of a novel protein-binding module--the WW domain. FEBS Lett 1995; 369:67-71. [PMID: 7641887 DOI: 10.1016/0014-5793(95)00550-s] [Citation(s) in RCA: 292] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We have identified, characterized and cloned human, mouse and chicken cDNA of a novel protein that binds to the Src homology domain 3 (SH3) of the Yes proto-oncogene product. We subsequently named it YAP for Yes-associated protein. Analysis of the YAP sequence revealed a protein module that was found in various structural, regulatory and signaling molecules. Because one of the prominent features of this sequence motif is the presence of two conserved tryptophans (W), we named it the WW domain. Using a functional screen of a cDNA expression library, we have identified two putative ligands of the WW domain of YAP which we named WBP-1 and WBP-2. Peptide sequence comparison between the two partial clones revealed a homologous proline-rich region. Binding assays and site-specific mutagenesis have shown that the proline-rich motif binds with relatively high affinity and specificity to the WW domain of YAP, with a preliminary consensus that is different from the SH3-binding PXXP motif. This suggests that the WW domain has a role in mediating protein-protein interactions via proline-rich regions, similar but distinct from Src homology 3 (SH3) domains. Based on this finding, we hypothesize that additional protein modules exist and that they could be isolated using proline-rich peptides as functional probes.
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Affiliation(s)
- M Sudol
- Laboratory of Molecular Oncology, Rockefeller University, New York, NY 10021, USA
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Mori T, Wanaka A, Taguchi A, Matsumoto K, Tohyama M. Differential expressions of the eph family of receptor tyrosine kinase genes (sek, elk, eck) in the developing nervous system of the mouse. BRAIN RESEARCH. MOLECULAR BRAIN RESEARCH 1995; 29:325-35. [PMID: 7609620 DOI: 10.1016/0169-328x(94)00263-e] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
To examine the roles of the eph subfamily of receptor tyrosine kinase (RTK), we isolated mouse cDNAs for sek, elk, and eck and localized their mRNAs in the developing mouse, with particular reference to the CNS development, by in situ hybridization. sek mRNA is most abundantly expressed throughout development; sek was detected in the germinal layer of the embryonic CNS during mid- to late-gestation and was widely expressed in the early postnatal brain. elk was expressed in the mantle layer of the embryonic CNS and showed a distribution complementary to that of sek. Differential expression of sek and elk was also observed in the early postnatal cerebellum; sek was expressed in the Purkinje cells, while elk was detected in the granule cells. eck was moderately expressed in the germinal layer of the embryonic CNS at mid-gestation, but its expression decreased as development proceeded. These spatio-temporally different patterns of gene expression suggest that these RTKs have distinct roles in mouse development despite their structural homology.
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Affiliation(s)
- T Mori
- Department of Anatomy and Neuroscience, Osaka University Medical School, Japan
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Stoker AW. Isoforms of a novel cell adhesion molecule-like protein tyrosine phosphatase are implicated in neural development. Mech Dev 1994; 46:201-17. [PMID: 7918104 DOI: 10.1016/0925-4773(94)90071-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The controlled development of embryo cells depends on their ability to monitor and respond to dynamic microenvironmental signals. This is frequently effected through membrane-associated receptor proteins which signal directly or indirectly through protein tyrosine phosphorylation. A search for such proteins in the developing nervous system of the chick has identified a new receptor-like protein tyrosine phosphatase (R-PTP) gene which may be responsible in part for this signalling. This gene, named CRYP alpha, is related to the LAR subfamily of R-PTPs and has extracellular homology to the neural cell adhesion molecules (CAMs). The gene is widely expressed in both the central and peripheral nervous systems, with particularly strong expression in motor neurons and in brain subregions such as the optic tectum and hypothalamus. Expression is seen both in early proliferating neuroepithelia and in subsets of post-mitotic nerve cells. Moreover, tissue-specific and developmentally-regulated exon use has been found in the brain, suggesting that isoforms of the R-PTP protein have stage-specific neural roles. This alternative RNA splicing event affects the encoded structure of the CAM-like domain, which may in turn influence its ligand binding properties. The novel, regulated expression of this R-PTP gene suggests that it plays a role in early neural development, and that the signalling properties of the encoded phosphatase can be modified according to the differentiated state of the cells.
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Affiliation(s)
- A W Stoker
- Department of Human Anatomy, University of Oxford, England, UK
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Ignelzi MA, Miller DR, Soriano P, Maness PF. Impaired neurite outgrowth of src-minus cerebellar neurons on the cell adhesion molecule L1. Neuron 1994; 12:873-84. [PMID: 7512817 DOI: 10.1016/0896-6273(94)90339-5] [Citation(s) in RCA: 233] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The nonreceptor tyrosine protein kinases pp60c-src, p59fyn, and pp62c-yes are localized in growth cones of developing neurons, but their function is undefined. To determine whether these tyrosine kinases were capable of regulating substrate-dependent axon growth, cultures of cerebellar neurons from wild-type, src-, fyn-, and yes- mice were analyzed for neurite outgrowth on the neural cell adhesion molecule L1 or the extracellular matrix protein laminin. The rate of neurite extension on L1 was reduced in src-, but not in fyn- or yes- neurons. Neurite extension on laminin was unaltered in src-, fyn-, or yes- neurons, indicating that pp60c-src, p59fyn, or pp62c-yes is not likely to participate in integrin-dependent axon growth. These results demonstrate that pp60c-src is a component of the intracellular signaling pathway in L1-mediated axonal growth and suggest that Src-related nonreceptor tyrosine kinases may have distinct, nonredundant functions in the nervous system.
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Affiliation(s)
- M A Ignelzi
- Department of Biochemistry and Biophysics, University of North Carolina School of Medicine, Chapel Hill 27599-7260
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11
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Yan H, Grossman A, Wang H, D'Eustachio P, Mossie K, Musacchio JM, Silvennoinen O, Schlessinger J. A novel receptor tyrosine phosphatase-sigma that is highly expressed in the nervous system. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(19)74547-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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12
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Abstract
The study of ubiquitously expressed proto-oncogenes or tumor suppressor genes provided important insights into the second messenger signaling pathways common to neural and non-neural tissues. Therefore, it is expected that the analysis of proto-oncogenes expressed in neural tissues should probe into neurotrophic and neurotransmitter receptors, ion channels and other molecules involved in processes underlying basic physiological functions of the nervous system. This expectation is fulfilled by ample experimental evidence. Using the trk, abl and src families of tyrosine kinase encoded proto-oncogenes, we discuss here new insights into the structural and functional organization of neural tissues gained from the molecular and genetic analyses of these genes and their products. Special attention is given to the description of initial steps of signaling through the Trk receptors in response to neurotrophic factors of the Nerve Growth Factor family. The genetic analysis of the Drosophila abl gene product identified new gene products that interact with the Abl protein. This analysis illuminates the power of Drosophila genetics in dissecting components of a signal transduction pathway. The Src-family of non-receptor type protein-tyrosine kinases is discussed from the point of functional redundancy as revealed by targeted gene disruption and expression studies. The recent progress in the field of proto-oncogenes has been impressive and it is expected that proto-oncogenes will continue to provide valuable tools in the study of the complex signaling pathways that underlie the physiological functions of the central nervous system.
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Affiliation(s)
- M Sudol
- Rockefeller University, New York, NY 10021
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Walaas SI, Zhao YH, Sudol M. Neuronal localization of the tyrosine-specific protein kinase p62c-yes in rat basal ganglia. Neurochem Res 1993; 18:43-6. [PMID: 8464535 DOI: 10.1007/bf00966921] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The cellular localization of the tyrosine-specific protein kinase p62c-yes, the product of the proto-oncogene c-yes, has been examined in the striatonigral neurons which interconnect the rat neostriatum and substantia nigra. Although p62c-yes was more enriched in the neostriatum than in the substantia nigra, excitotoxin-induced necrosis of nerve cells in the neostriatum led to 50-60% decreases of p62c-yes both in the lesioned neostriatum and in the ipsilateral substantia nigra. Hence, the p62c-yes tyrosine kinase is present both in the cell body region and in the axonal and nerve terminal region of the striatonigral neurons. This localization indicates that the enzyme may be involved in both presynaptic and postsynaptic functions in mammalian forebrain neurons.
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Affiliation(s)
- S I Walaas
- Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, NY 10021
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14
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Marani E, Maassen JA. Phosphotyrosine localization in the mature rat brain. PROGRESS IN HISTOCHEMISTRY AND CYTOCHEMISTRY 1992; 26:271-83. [PMID: 1283018 DOI: 10.1016/s0079-6336(11)80105-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- E Marani
- Department of Physiology, Sylvius Laboratory, Leiden Medical Faculty, The Netherlands
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15
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Identification and characterization of oncogeneyes-homologous genomic clones fromDrosophila melanogaster. J Genet 1991. [DOI: 10.1007/bf02927868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Srivastava AK, Chiasson JC, Chiasson JL, Lacroix A, Windisch L. Biochemical characteristics of cytosolic and particulate forms of protein tyrosine kinases from N-methyl-N-nitrosourea (MNU)-induced rat mammary carcinoma. Mol Cell Biochem 1991; 106:87-97. [PMID: 1922015 DOI: 10.1007/bf00231192] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Protein tyrosine kinase (PTK) activities in methyl nitrosourea (MNU)-induced rat mammary carcinoma has been investigated by using poly (glu: tyr; 4:1) as an exogenous substrate. The PTK activity of the mammary carcinoma was almost equally distributed between the particulate and soluble (cytosolic) fractions at 110,000 X g. The activity of the particulate enzyme was stimulated by non-ionic detergent Triton X-100 by about 2-fold whereas the detergent had no effect on the cytosolic form. More than 60% of the particulate enzyme could be solubilized by 5% Triton X-100. Although, both particulate and cytosolic PTKs catalyzed the phosphorylation of several tyrosine containing synthetic substrates to various degrees, poly (glu: tyr; 4:1) was the best substrate (apparent Km. 0.7 mg/ml). Both forms of enzymes utilized ATP as the phosphoryl group donor, with an apparent Km of 40 microM. Among various divalent cations tested, Co2+, Mn2+ and Mg2+ were able to fulfill the divalent cation requirement of both forms of the PTKs. All these cations exerted biphasic effects on the kinase activities, however, Mg2+ was the most potent cation. Agents such as epidermal growth factor, insulin and platelet derived growth factor which stimulate their respective receptor-PTK activities were without effect on PTK activities of mammary carcinoma. On the other hand, though heparin and quercetin inhibited both enzyme activities in a concentration dependent manner, the particulate form was more sensitive to inhibition than the cytosolic form. These data indicate that MNU-induced rat mammary carcinoma expresses both particulate and cytosolic forms of PTKs and that there are significant differences in the properties of the two forms of PTKs. Differential effects of some agents on mammary carcinoma PTKs suggest that these enzymes may be acutely regulated in vivo and could play an important role in mammary carcinogenesis.
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Affiliation(s)
- A K Srivastava
- Research Group on Diabetes and Metabolic Regulation, University of Montreal, Québec, Canada
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Abstract
Evidence in the past year has provided support for a prominent role of tyrosine phosphorylation in the regulation of neuronal function. The discovery that many novel forms of protein tyrosine kinases and phosphatases are expressed in the brain has revealed that the regulation of tyrosine phosphorylation is highly complex. The recent identification of substrate proteins in the brain for the protein tyrosine kinases and phosphatases has begun to clarify the functional role of tyrosine phosphorylation in the development and modulation of the nervous system.
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Affiliation(s)
- K R Wagner
- Howard Hughes Medical Institute, Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
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Niedobitek G, Herbst H. Applications of in situ hybridization. INTERNATIONAL REVIEW OF EXPERIMENTAL PATHOLOGY 1991; 32:1-56. [PMID: 1713899 DOI: 10.1016/b978-0-12-364932-4.50005-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- G Niedobitek
- Institute of Pathology, Klinikum Steglitz, Freie Universität Berlin, Germany
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Srivastava AK. Non-receptor protein tyrosine kinases of normal tissues. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1990; 22:1229-34. [PMID: 2257948 DOI: 10.1016/0020-711x(90)90303-k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- A K Srivastava
- Research Group on Diabetes and Metabolic Regulation, Clinical Research Institute of Montreal, Québec, Canada
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