Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:2.7.11.12 (PKG)
 2,515 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The regulatory (R) domain of PKC alpha fused to glutathione-S-transferase (GST-R alpha) competitively inhibited PKC activity associated with extracts of Y1 mouse adrenocortical tumor cells and the activities of several specific PKC isozymes. GST-R alpha did not inhibit the activities of cAMP-dependent protein kinase, cGMP-dependent protein kinase or calmodulin-dependent myosin light chain kinase. GST-R alpha inhibited PKC activities 20 times more potently than did a synthetic peptide corresponding to the pseudosubstrate sequence of PKC alpha. In intact yeast cells, the R domain prevented PKC beta-1-induced inhibition of growth and cytokinesis. These results indicate that the R domain of PKC alpha acts as a specific, dominant inhibitor of PKC activity, and suggest that the PKC alpha R domain may provide a useful genetic tool to assess the roles of PKC in various signal transduction processes.
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PMID:Molecular strategies for the dominant inhibition of protein kinase C. 896 21

Cyclic-GMP-dependent protein kinase (PKG) is widely appreciated as having diverse roles in a variety of cell types. Many reports have indicated that PKG might regulate cell function by activating members of the mitogen-activated protein kinase (MAPK) family of signaling proteins. In this study, stimulation of HEK-293 cells with nitric oxide (NO) was found to induce a rapid accumulation of phosphorylated p38 MAPK. The involvement of PKG in this process was confirmed by cotransfection of a dominant negative PKG construct (G1alphaR-GFP), which was able to block cGMP-induced p38 MAPK activation. Transfection of cells to express dominant negative Rac1(T17N) was also able to dose-dependently block cGMP-stimulated activation of p38 MAPK, thus indicating the importance of this pathway downstream of PKG. GST-PDB affinity-precipitation experiments revealed that stimulation of HEK293 cells with either nitric oxide or 8-Br-cGMP resulted in a rapid and transient activation of Rac1 with similar kinetics to p38 MAPK phosphorylation. Moreover, using in vitro kinase assays it was found that cGMP also stimulated the activity of the Rac1 effector Pak1. The activation of both Rac1 and Pak1 by 8-Br-cGMP was completely abolished by transfection of the cells with G1alphaR-GFP. Expression of the Rac1(T17N) mutant inhibited PKG-dependent activation of PAK1 indicating that Rac1 functions upstream of PAK1 in this pathway. Immunofluorescence experiments demonstrated clear colocalization of PKG and Rac1 in membrane ruffles and dynamic membrane regions supporting a functional interaction. However, in vitro kinase assays demonstrated that Rac1 is not a substrate for PKG suggesting an indirect activation mechanism. Taken together these data demonstrate a novel PKG-dependent pathway by which the Rac1/Pak1 pathway is activated. Furthermore, we demonstrate that this pathway is central to the activation of p38 MAPK by PKG in these cells.
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PMID:Activation of the small GTPase Rac1 by cGMP-dependent protein kinase. 1521 66

RPS19 is a component of the 40S small ribosomal subunit encoded by RPS19 gene. The cDNA of RPS19 was cloned successfully for the first time from the Giant Panda using RT-PCR technology. It was also sequenced, analyzed preliminarily, and expressed in Escherichia coli. The length of cDNA fragment cloned is 469 bp, and it contains an open-reading frame of 438 bp encoding 145 amino acids. Alignment analysis indicates that the nucleotide sequence and the deduced amino acid sequence share a high homology with those of Homo sapiens, Mus musculus, and Rattus norvegicus by 95.89%, 92.47%, and 93.61%, and 100.00%, 99.31%, and 99.31%, respectively. Topology prediction shows that there is one cAMP- and cGMP-dependent protein kinase phosphorylation site, four protein kinase C phosphorylation sites, one casein kinase II phosphorylation site, one tyrosine kinase phosphorylation site, three N-myristoylation sites, one amidation site, and one ribosomal protein S19e signature in the RPS19 protein of the Giant Panda (Ailuropoda melanoleuca). The RPS19 gene was overexpressed in E. coli and expression confirmed by western blotting. The results indicated that the RPS19 gene can be readily expressed in E. coli, and the N-terminally GST-tagged protein was a 42 kDa polypeptide, in good agreement with the predicted molecular weight. The protein obtained could be purified and its function studied.
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PMID:cDNA cloning and overexpression of ribosomal protein S19 gene (RPS19) from the Giant Panda. 1907 23