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A common CORIN variant in hypertension reduces corin intracellular trafficking by exposing an inhibitory N-terminus.

Biochem Biophys Res Commun. 2020 Sep 10;530(1):35-41. Epub 2020 Jul 28
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摘要


Corin is a transmembrane serine protease that activates atrial natriuretic peptide, a cardiac hormone essential for normal blood pressure. Corin is synthesized as a zymogen and activated on the cell surface. In previous studies, we identified a CORIN variant allele with an adenine insertion in the 5'-end of the coding region in ∼5% of hypertensive individuals in a Chinese population. The protein, named insA, encoded by the CORIN variant allele has a shortened cytoplasmic tail and reduced atrial natriuretic peptide processing activity. It remains unknown how a shortened cytoplasmic tail impairs corin function. In this study, we expressed a series of corin mutants with different N-terminal sequences and analyzed them by Western blotting, flow cytometry, protein chase, and immunostaining. Our results revealed that a Gly-Asn sequence after the initiating Met at the newly generated N-terminus was responsible for delaying corin trafficking in the Golgi. Deletion of the N-terminal Gly and Asn residues increased the intracellular trafficking, cell surface expression, and activation cleavage of the insA variant. These results help to explain how the CORIN variant allele impairs corin structure and function as an underlying mechanism in hypertension.

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