Determination of angiotensin I-converting enzyme activity in cell culture using fluorescence resonance energy transfer peptides

Determination of angiotensin I-converting enzyme activity in cell culture using fluorescence resonance energy transfer peptides

Author Sabatini, R. A. Google Scholar
Bersanetti, P. A. Google Scholar
Farias, S. L. Google Scholar
Juliano, L. Google Scholar
Juliano, M. A. Google Scholar
Casarini, D. E. Google Scholar
Carmona, A. K. Google Scholar
Paiva, A. C. M. Google Scholar
Pesquero, J. B. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract An assay using fluorescence resonance energy transfer peptides was developed to assess angiotensin I-converting enzyme (ACE) activity directly on the membrane of transfected Chinese hamster ovary cells (CHO) stably expressing the full-length somatic form of the enzyme. the advantage of the new method is the possibility of using selective substrates for the two active sites of the enzyme, namely Abz-FRK(Dnp)P-OH for somatic ACE, Abz-SDK(Dnp)P-OH for the N domain, and Abz-LFK(Dnp)-OH for the C domain. Hydrolysis of a peptide bond between the donor/acceptor pair (Abz/Dnp) generates detectable fluorescence, allowing quantitative measurement of the enzymatic activity. the kinetic parameter K-m for the hydrolysis of the three substrates by ACE in this system was also determined and the values are comparable to those obtained using the purified enzyme in solution. the specificity of the activity was demonstrated by the complete inhibition of the hydrolysis by the ACE inhibitor lisinopril. Therefore, the results presented in this work show for the first time that determination of ACE activity directly on the surface of intact CHO cells is feasible and that the method is reliable and sensitive. in conclusion. we describe a methodology that may represent a new tool for the assessment of ACE activity which will open the possibility to study protein interactions in cells in culture. (c) 2007 Elsevier Inc. All rights reserved.
Keywords angiotensin I-converting enzyme
cell culture
fluorimetric assay
fluorescence resonance energy transfer (FRET) peptides
enzyme activity
CHO cells
aorta smooth muscle cells (ASMC)
Language English
Date 2007-04-15
Published in Analytical Biochemistry. San Diego: Academic Press Inc Elsevier Science, v. 363, n. 2, p. 255-262, 2007.
ISSN 0003-2697 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 255-262
Access rights Closed access
Type Article
Web of Science ID WOS:000245377500011

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