Pig kidney angiotensin converting enzyme. Purification and characterization of amphipathic and hydrophilic forms of the enzyme establishes C-terminal anchorage to the plasma membrane

Hooper, N. M., Keen, J., Pappin, D. J., Turner, A. J. (October 1987) Pig kidney angiotensin converting enzyme. Purification and characterization of amphipathic and hydrophilic forms of the enzyme establishes C-terminal anchorage to the plasma membrane. Biochem J, 247 (1). pp. 85-93. ISSN 0264-6021 (Print)0264-6021 (Linking)

URL: http://www.ncbi.nlm.nih.gov/pubmed/2825659

Abstract

Angiotensin converting enzyme from pig kidney was isolated by affinity chromatography after solubilization from the membrane by one of four different procedures. Solubilization with Triton X-100, trypsin or by an endogenous activity in microvillar membranes all generated hydrophilic forms of the enzyme as assessed by phase separation in Triton X-114 and failure to incorporate into liposomes. Only when solubilization and purification was effected by Triton X-100 in the presence of EDTA (10 mM) could an amphipathic form of the enzyme (membrane- or m-form) be generated. The m-form of angiotensin converting enzyme (ACE) appeared slightly larger (Mr approx. 180,000) than the hydrophilic forms (Mr approx. 175,000) after SDS/polyacrylamide-gel electrophoresis, and the m-form incorporated into liposomes, consistent with retention of the membrane anchor. The m-form of ACE showed an N-terminal sequence identical with that of preparations of enzyme isolated after solubilization with detergent alone (d-form), with trypsin (t-form) or by the endogenous mechanism (e-form). These data imply that ACE is anchored to the plasma membrane via its C-terminus, in contrast with the N-terminal anchorage of endopeptidase-24.11. No release of ACE from the membrane could be detected with a variety of phospholipases, including bacterial phosphatidylinositol-specific phospholipases C, although an endogenous EDTA-sensitive membrane-associated hydrolase was capable of releasing a soluble, hydrophilic, form of the enzyme.

Item Type: Paper
Uncontrolled Keywords: Amino Acid Sequence Animals Cell Membrane/enzymology Detergents Electrophoresis, Polyacrylamide Gel Kidney/ enzymology Liposomes/metabolism Peptidyl-Dipeptidase A/isolation & purification/ metabolism Phospholipases/pharmacology Polyethylene Glycols Swine
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > angiotensin converting enzyme
biotechnology > chromatography > protein purification
CSHL Authors:
Communities: CSHL labs > Pappin lab
Depositing User: Matt Covey
Date: 1 October 1987
Date Deposited: 09 Sep 2014 21:12
Last Modified: 09 Sep 2014 21:12
PMCID: PMC1148373
Related URLs:
URI: http://repository.cshl.edu/id/eprint/30770

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