Venkat Radhika

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Galpha13, the alpha-subunit of the heterotrimeric G protein G13, has been shown to stimulate cell migration in addition to inducing oncogenic transformation. Cta, a Drosophila ortholog of G13, has been shown to be critical for cell migration leading to the ventral furrow formation in Drosophila embryos. Loss of Galpha13 has been shown to disrupt cell(More)
With the increasing threat of environmental toxicants including biological and chemical warfare agents, fabricating innovative biomimetic systems to detect these harmful agents is critically important. With the broad objective of developing such a biosensor, here we report the construction of a Saccharomyces cerevisiae strain containing the primary(More)
Lysophosphatidic acid (LPA), a major G protein coupled receptor (GPCR)-activating ligand present in serum, elicits growth factor like responses by stimulating specific GPCRs coupled to heterotrimeric G proteins such as G(i), G(q), and G12/13. Previous studies have shown that the overexpression of wild-type Galpha12 (Galpha12WT) results in the oncogenic(More)
Heterotrimeric guanine nucleotide binding proteins, commonly known as G proteins form a super-family of signal transduction proteins. They are peripherally associated with the plasma membrane and provide signal coupling to seven transmembrane surface receptors. G proteins are composed of monomers of alpha, beta, and gamma subunits. The beta- and(More)
One of the major stress factors during space and high-altitude flight is the oxidative damage caused by the release of reactive oxygen intermediates (ROIs) in human tissues. ROIs are released in response to several stress factors including radiation in space. Since ROIs contribute to several pathological conditions, there has been a great interest in(More)
With the broad objective of developing a heterologous expression system for the mammalian olfactory signaling pathway, we have engineered yeast cells in which the mammalian olfactory signaling pathway is genetically integrated. Our results demonstrate that the prototypic "olfactory yeast" strain WIF-1alpha can sense and report the presence of defined(More)
Saccharomyces cerevisiae responds to extracellular toxic stimuli by increasing intracellular cyclic AMP levels, leading to activation of a cAMP-dependent protein kinase, protein kinase A (PKA). Activated PKA phosphorylates downstream substrates, including specific DNA-binding proteins, to turn off the expression of most or all of the yeast genes. Such(More)
Chronic myeloid leukemia (CML), a hematopoietic stem cell disorder, is characterized by the presence of Philadelphia chromosome (Ph1). Earlier studies have shown that various functions, such as chemotaxis, fluid phase pinocytosis, phagocytosis, and degranulation in response to chemotactic peptide formyl-methionyl-leucyl-phenylalanine (fMLP), were defective(More)
Binding of chemoattractant to polymorphonuclear leukocytes (PMNL) triggers a series of events like polymerization of actin and tubulin, orientation of cells, chemotaxis, increase in fluid pinocytosis and phagocytosis, and stimulation of microbicidal pathways which includes lysosomal degranulation and generation of reactive oxygen species. Earlier studies(More)
Galpha(12), the alpha-subunit of G protein G12, is ubiquitously expressed and it has been identified as a putative "causative oncogene" of soft-tissue sarcomas. Overexpression of wild-type or GTPase-deficient mutant of Galpha(12) (Galpha(12)Q229L or Galpha(12)QL) leads to the oncogenic transformation of NIH3T3 cells. Galpha(12)QL-tramsformed NIH3T3 cells(More)