Preparative isolation of angiotensin-converting enzyme from human lung. |
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Authors: | Q C Meng S J King K E Branham L J Delucas B Lorber S Oparil |
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Institution: | Department of Cell Biology and Medicine, University of Alabama, Birmingham 35294. |
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Abstract: | Angiotensin-converting enzyme from human lung was purified to apparent homogeneity using a five-step purification procedure consisting of ammonium sulfate precipitation, ion-exchange chromatography on DEAE Sephadex A-50, gel permeation on Sephadex G-200, chromatofocusing on a polybuffer exchange (PBE 94) column and high-performance liquid chromatographic gel permeation on a Bio-Sil TSK-250 column. This procedure gave an approximately 700-fold purification with a 20% yield compared to a 550-fold purification and a 1% yield with an affinity chromatography-based procedure. The 20-fold greater yield of the five-step procedure offers a major advantage for preparative use in the structural characterization of angiotensin-converting enzyme. |
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