Exam Review - Chapter 12

1 g protein coupled receptor indirectly activate

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Unformatted text preview: al feature of signal transduction: a signal interacts with a receptor; the activated receptor interacts with cellular machinery, producing a second signal or a change in the activity of a cellular protein; the metabolic activity undergoes change, transduction ends Six general types of signal transducers: 1. G protein- coupled receptor: indirectly activate enzymes that generate intracellular second messengers External ligand binds to recepotr and activates GTP- binding protein, which regulates an enzyme that generates an intracellular second messenger a. B- adrenergic receptor system that detects epinephrine 2. Receptor tyrosine kinase: plasma membrane recepotrs that are also enzymes a. When one of these recepotrs is acitivated by a ligand, it catalyzes the autophosphorylation of...
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