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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of the MAP2- and P75- binding domain in the regulatory subunit (RII beta) of type II cAMP-dependent protein kinase. Cloning and expression of the cDNA for bovine brain RII beta.

cDNA clones coding for the regulatory subunit (RII beta) of type II cAMP-dependent protein kinase were isolated from a bovine brain cDNA expression library in lambda gt11. The cDNA codes for a protein of 418 amino acids which is 98% homologous to the rat and human RII beta proteins. A series of expression vectors coding for truncated RII beta proteins were constructed in pATH plasmids and fusion proteins were expressed in Escherichia coli. Polyclonal and monoclonal antibodies made against purified bovine brain RII were immunoreactive with the fusion proteins on Western blots. The expressed RII beta-fusion proteins were used in overlay assays to identify the region in RII beta which binds to microtubule-associated protein 2 (MAP2) and to the 75,000-dalton calmodulin-binding protein ( P75) (Sarkar, D., Erlichman, J., and Rubin, C.S. (1984) J. Biol. Chem. 259, 9844-9846) in bovine brain. Fusion protein containing amino acids 1-50 of the RII beta NH2 terminus (RII beta(1-50)] bound to both MAP2 and P75 immobilized on nitrocellulose filters. A pATH11-directed fusion protein containing the 31 amino acid RII-binding site of the human MAP2 protein (MAP2(31)) (Rubino, H.M., Dammerman, M., Shafit-Zagardo, B., and Erlichman, J. (1989) Neuron 3, 631-638) also bound RII beta-fusion proteins containing RII beta amino acids 1-50. Three fusion proteins, RII beta(1-25), RII beta(25-96), and RII beta(1-265,25-96 deleted) did not bind to MAP2(31) nor P75. The results showed that the binding domain for MAP2 and P75 was located within the NH2-terminal 50 amino acids of RII beta. Preincubation of bovine heart protein kinase II alpha and RII beta(1-50) with MAP2(31) prevented their binding to both P75 and MAP2(31) that were immobilized on nitrocellulose, suggesting that the binding sites for MAP2 and P75 are located near each other or that the same site on RII was binding to both proteins.[1]


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