PMID: 40790Sep 1, 1979

A fluorescamine-based sensitive method for the assay of proteinases, capable of detecting the initial cleavage steps of a protein

European Journal of Biochemistry
R GaresseR Marco

Abstract

The properties of the reaction of fluorescamine with proteins are the basis for the development of a sensitive, general and simple method for the assay of proteolytic activities. More importantly, the assay measures the initial step(s) of proteolytic attack, making it specially suitable for the examination of the controlling factors that regulate proteolytic degradation and/or the detection of 'specific' proteinases. The method allows the simple determination of the general parameters of enzyme action, V and Km, using proteins, i.e. the physiological substrates of the proteinases. The more appropriate proteins to be used as substrates are the N-amino-terminally blocked ones. Many proteins fulfill this requirement. If the particular protein whose degradation has to be studied lacks this modification, three different approaches can be used to study its degradation: (a) the accumulation of N-amino termini in excess over that of the intact substrate; (b) a gel filtration/continuous method and (c) the chemical blockage of its amino groups. The particular advantages of each of these approaches are discussed.

References

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Citations

Jan 1, 1977·Annual Review of Biophysics and Bioengineering·R M StroudJ L Chambers
Feb 1, 1978·Analytical Biochemistry·C FurihataT Sugimura
Jul 8, 1977·Science·H Bloemendal
Nov 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·H Neurath, K A Walsh
Jan 1, 1975·Annual Review of Biochemistry·A Hershko, M Fry
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Related Concepts

Endopeptidases
Fluorescence Spectroscopy
Spiro Compounds
Fluram
Hydrogen-Ion Concentration

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