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EQUINE ANGIOTENSIN CONVERTING ENZYME: A ZINC METALLOENZYME
Author(s) -
Fernley Ross T.
Publication year - 1977
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1111/j.1440-1681.1977.tb02624.x
Subject(s) - enzyme , zinc , chemistry , biochemistry , angiotensin converting enzyme , renin–angiotensin system , angiotensin ii , biology , endocrinology , receptor , organic chemistry , blood pressure
SUMMARY 1. Angiotensin I converting enzyme from horse plasma has been extensively purified and shown to be homogeneous by disc‐gel electrophoresis. 2. The metal ion involved in the catalytic reaction of the enzyme has been identified for the first time as zinc by atomic absorption spectrometry. 3. A number of other physicochemical properties of the enzyme are described and compared with results obtained by other investigators. The molecular weight was determined by gel filtration to be 113 000 daltons. The pH maximum was found to be 7.4. The chloride activation of the enzyme appears to act by facilitation of substrate binding to the enzyme. 4. By use of enzyme inhibitors, tyrosine has been implicated as a functional residue at the active site of the enzyme. 5. The enzyme shows a fairly high degree of specificity towards its substrates.