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Novel proteins that interact with the COOH-terminal cytosolic routing determinants of an integral membrane peptide-processing enzyme.

J Biol Chem. 1996 Nov 08;271(45):28636-40
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摘要


The steady state distribution of membrane forms of peptidylglycine alpha-amidating monooxygenase (PAM) in the secretory pathway of neurons and endocrine cells depends on signals in its cytosolic COOH-terminal domain (CD). Mutagenesis studies yielded catalytically active PAM proteins that are not properly localized or internalized. Employing the yeast two-hybrid system, we isolated two distinct cDNAs whose protein products showed a strong interaction with the CD of PAM. The interaction of these novel PAM COOH-terminal interactor proteins (P-CIPs) did not occur with a misrouted CD mutant as bait in the yeast system. Both proteins, P-CIP2 and P-CIP10, were expressed as fusion proteins that interacted in vitro with solubilized integral membrane PAM. P-CIP2 was homologous to several serine/threonine and dual specificity protein kinases, while P-CIP10 contained spectrin-like repeats. Endogenous P-CIP2 was localized to the Golgi region of AtT-20 corticotrope tumor cells, and expression of integral membrane PAM disrupted the distribution of endogenous P-CIP2. Both P-CIP2 and P-CIP10 mRNAs were found to be expressed in rat brain neurons also expressing PAM proteins. P-CIP2 and P-CIP10 may be members of a family of cytosolic proteins involved in the routing of membrane proteins that function in the regulated secretory pathway.

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