Add time:08/29/2019         Source:sciencedirect.com

Two proteolytic activities that convert big ET to ET at neutral pH were identified in solubilized membranes prepared from rat lung. The endothelin-converting activities were partially purified by using A80227 (2S,3R,4S)-2-{[N-acetylcyclohexylalanyl- isoleucyl]amino}-1-(2-naphthyl)-3,4-dihydroxy-6- methylheptane) coupled to an affinity-gel columnn (Affigel), and subsequently by concanavalin-A immobilized gel chromatography. An endothelin-converting activity was identified in the fraction containing proteins that did not bind to A80227-Affigel. This protease was sensitive to phosphoramidon, soybean trypsin inhibitor, and chymostatin, and preferred big ET-1 or big ET-2 as its substrate over big ET-3. A second endothelin-converting activity was identified in the fraction containing proteins that bound to the A80227-coupled gel and was eluted by raising the pH. This protease exhibited activities throughout a range of pH 5.5– 9.5, was inhibited by pepstatin A and A80227, and also preferred big ET-1 or big ET-2 over big ET-3 as its substrate. Both enzymes were glycoproteins based on their binding to concanavalin-A immobilized gel and were readily eluted by a buffer containing 0.5 M manopyranoside. The results from the pH and protease inhibitor profiles suggesting that these two ET-converting activities extracted from rat lung membranes are distinct and are distinct and are different from the previously reported endothelin-converting enzymes.

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