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Cell Signaling - produces glucose from the storage molecule...

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Cell Signaling All cells receive and respond to signals from their surroundings. The signals may be environmental factors like light or they may be signals produced by other cells . Signals from other cells are especially important in complex multicellular organisms, like humans, where they integrate and coordinate the functions of the individual cells for the benefit of the whole organism. Epinephrine , via protein kinase A , therefore acts two-fold to increase glucose concentrations in the muscle cell: it induces the activation of the enzyme that
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Unformatted text preview: produces glucose from the storage molecule glycogen (glycogen phosphorylase) and it induces the inhibition of the enzyme that consumes glucose to form glycogen (glycogen synthase). Phosphorylation of a protein via a protein kinase is a frequent step in intracellular signal transduction. The reaction can even be arranged in whole phosphorylation cascades where one protein kinase phosphorylates another which in turn phosphorylates another and so on....
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