Two-layer antibody capture of enzymes on the surface of microtiter plates: application to the study of the regulation of phospholipase C-gamma1 catalytic activity

In vitro quantification of the catalytic activity of an enzyme isoform requires the availability of selective agents that allow for either measurements in the presence of the other enzyme isoforms or purification of the isoform and subsequent performance of these measurements on the purified enzyme....

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Bibliographic Details
Published in:Analytical biochemistry 2003-09, Vol.320 (2), p.193-198
Main Authors: Buckley, Colin T, Caldwell, Kevin K
Format: Article
Language:English
Subjects:
Animals
Antibodies - immunology
Chemistry Techniques, Analytical - methods
Enzymes - analysis
Enzymes - immunology
Female
Phospholipase C gamma
Rats
Rats, Sprague-Dawley
Time Factors
Type C Phospholipases - analysis
Type C Phospholipases - immunology
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Summary:In vitro quantification of the catalytic activity of an enzyme isoform requires the availability of selective agents that allow for either measurements in the presence of the other enzyme isoforms or purification of the isoform and subsequent performance of these measurements on the purified enzyme. Isozyme-specific antibodies are useful tools for these types of analyses. In the present report, we detail a method for the measurement of phospholipase C-gamma1 enzyme activity employing native enzyme that is immobilized on microtiter plates. The method uses biotinylated antiglobulin bound to streptavidin-coated microtiter plates to immobilize antiphospholipase C-gamma1 antibody and subsequently capture phospholipase C-gamma1 from brain tissue lysates. This method avoids biotinylation of the primary (antiphospholipase C-gamma1) antibody, making it less labor intensive than previously described methods for using streptavidin-coated plates; in addition, it is highly reproducible and sensitive and allows for quantification of enzyme activity. We employ the technique to show that one or more tyrosine kinases copurify with rat brain phospholipase C-gamma1. The method is applicable to the study of any enzyme isoform for which antibodies that capture the native form of the enzyme are available and could easily be employed in high-throughput procedures.
ISSN:0003-2697