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4 June, 03:11

CAMP activates cAMP-dependent protein kinase by

bindingregulatory subunits and inducing their release from the

catalyticsubunits.

stimulating itsphosphorylation.

stimulating thedimerization of kinase subunits.

stimulating therelease of a translational inhibitory protein

bound to itsmRNA.

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  1. 4 June, 03:54
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    binding regulatory subunits and inducing their release from the catalytic subunits

    Explanation:

    cAMP molecules diffuse into the cytoplasm where they bind to an allosteric site on a regulatory subunit of a cAMP-dependent protein kinase (protein kinase A, PKA).

    -In its inactive form, PKA is a heterotetramer comprised of two subunits namely, regulatory (R) and two catalytic (C) subunits.

    -The regulatory subunits normally inhibit the catalytic activity of the enzyme. cAMP binding causes the dissociation of the regulatory subunits, thereby releasing the active catalytic subunits of PKA.

    -cAMP stimulates glucose mobilization by activating a protein kinase that adds a phosphate group onto a specific serine residue of the glycogen phosphorylase polypeptide.
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