Abstract
Specificity in cell signalling can be influenced by the targeting of different enzyme combinations to substrates. The A-kinase anchoring protein AKAP79/150 is a multivalent scaffolding protein that coordinates the subcellular localization of second-messenger-regulated enzymes, such as protein kinase A, protein kinase C and protein phosphatase 2B. We developed a new strategy that combines RNA interference of the endogenous protein with a protocol that selects cells that have been rescued with AKAP79/150 forms that are unable to anchor selected enzymes. Using this approach, we show that AKAP79/150 coordinates different enzyme combinations to modulate the activity of two distinct neuronal ion channels: AMPA-type glutamate receptors and M-type potassium channels. Utilization of distinct enzyme combinations in this manner provides a means to expand the repertoire of cellular events that the same AKAP modulates.
Publication types
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Research Support, N.I.H., Extramural
MeSH terms
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Adaptor Proteins, Signal Transducing / metabolism
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Adaptor Proteins, Signal Transducing / physiology*
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Calcineurin / metabolism*
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Calcineurin / physiology
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Calcineurin Inhibitors
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Carrier Proteins / metabolism*
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Cell Line
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Cyclic AMP-Dependent Protein Kinases / metabolism*
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Discs Large Homolog 1 Protein
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Humans
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Membrane Proteins / metabolism
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Membrane Transport Proteins / metabolism
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Membrane Transport Proteins / physiology*
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Models, Biological
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Muscarinic Agonists
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Potassium Channels / metabolism
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RNA Interference
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Signal Transduction
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Time Factors
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Transfection
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alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / metabolism
Substances
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Adaptor Proteins, Signal Transducing
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Calcineurin Inhibitors
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Carrier Proteins
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DLG1 protein, human
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Discs Large Homolog 1 Protein
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Membrane Proteins
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Membrane Transport Proteins
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Muscarinic Agonists
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Potassium Channels
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alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid
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Cyclic AMP-Dependent Protein Kinases
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Calcineurin