During an inflammatory response that triggers neutrophil migration through chemotaxis signaling, a family of GPCRs are involved in interpreting chemokine signals. Studies have shown that addition of Pertussis toxin can block chemokine signaling suggesting that these GPCRs are ______________ and that the Pertussis toxin must be enriching for ___________ and thus blocking activation of the pathway. Group of answer choices kinase associated receptors; inhibited Src kinase Gi coupled receptors; G-alpha bound to GTP Gs coupled receptors; G-alpha bound to GTP Gi coupled receptors; G-alpha bound to GDP Gs coupled receptors; G-alpha bound to GDP
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Depending on the cellular context, GPCRs can activate either G-alpha-s or G-alpha-i proteins. When bound to GTP, G-alpha-s stimulates adenylyl cyclase, while GTP-bound G-alpha-i inhibits adenylyl cyclase.
Madhur L.
Which is true of the GTP-binding proteins that participate in intracellular signaling? Choose one: G-protein-coupled receptors interact with all types of GTP-binding proteins. Only monomeric GTP-binding proteins relay messages from G-protein-coupled receptors. Only trimeric GTP-binding proteins relay messages from G-protein-coupled receptors. Only trimeric GTP-binding proteins participate in intracellular cell signaling. Only trimeric GTP-binding proteins interact with guanine nucleotide exchange factors (GEFs).
Suman K.
Question: Read the following information and predict the type of G protein involved in each case. (More than one answer is possible, choose the best choice/choices). You are studying cellular signaling through G-Protein Coupled Receptors (GPCRs). Specifically, you're working on a pair of newly identified GPCRs, GPCR-A and GPCR-B. Each binds the same small ligand but activates different heterotrimeric G-proteins that act on adenylate cyclase. Observe and interpret TABLE 1 described below. Assume your experimental Reaction Mixture 1 contains GPCR-A and GPCR-B. You assayed for the levels of cAMP. Your data showed a total concentration of cAMP in that reaction mixture was 1000 picomoles per unit protein concentration. You could not conclude which type of GPCR is or are present. In order to identify the type of GPCR present in the mixture, you separated GPCR-A and GPCR-B by column chromatography and purified them. You again assayed for the levels of cAMP in these two reaction mixtures. Your data showed Reaction Mixture 2 contains 100 picomoles of cAMP per unit protein concentration, and Reaction Mixture 3 contains 900 picomoles of cAMP per unit protein concentration. TABLE 1: cAMP concentrations. Reaction Mixture cAMP concentration (pmoles per unit protein concentration) Predict the type of G protein involved Reaction Mixture 1: GPCR-A + GPCR-B 1000 ? Reaction Mixture 2: GPCR-A 100 ? Reaction Mixture 3: GPCR-B 900 ? Conclusions can't be drawn. Reaction Mixture 1 (GPCR-A + GPCR-B) contains only Gs and Gi; or only Gs is present. Conclusion can't be drawn. Reaction Mixture 2 (GPCR-A) contains Gi protein, or inhibitory G protein. Conclusion can't be drawn. Reaction Mixture 3 (GPCR-B) may contain Gi protein, or inhibitory G protein. Conclusion can't be drawn. Reaction Mixture 1 (GPCR-A + GPCR-B) contains only purified Gi protein. Conclusion can't be drawn. Reaction Mixture 3 (GPCR-B) contains Gs protein, or stimulatory G protein. High protein kinase blocking activity is observed in Reaction Mixture 1 (GPCR-A + GPCR-B). Phosphoprotein diesterase activity is not noticeable in Reaction Mixture 2. Phosphoprotein diesterase activity is not noticeable in Reaction Mixture 1. It only shows a high influence of inositol phosphate-3 and calcium release-induced response.
Supreeta N.
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