Kinetic Assay Methods
1University of Florida, Gainesville, Florida
Abstract
The purpose of this unit is to provide a brief review of issues important in the design of initial-rate assay methods. General aspects of kinetic assay design are discussed, including enzyme and substrate purity, concentration and stability. Also covered are issues such as continuous versus stop-time assay formats, coupled enzyme assays, binding studies, and presentation of initial-rate data.
Figures
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Figure 3.5.1Typical progress curve for an enzyme-catalyzed reaction, where a represents the pre-steady-state region, b the steady-state region, c the post-steady-state region, and d the equilibrium region.
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Figure 3.5.2Double-reciprocal plot of a two-substrate enzyme-catalyzed reaction, where v = the velocity of the reaction and [A] and [B] represent the concentrations of substrates A and B respectively.
Literature Cited
| Literature Cited | |
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| Allison, R.D. and Purich, D.L. 1979. Practical considerations in the design of initial velocity enzyme rate assays. Methods Enzymol. 63:3-22. | |
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| Bergmeyer, H.U. (ed.) 1983. Methods of Enzymatic Analysis, 3rd ed., Vols. 1-4. Verlag Chemie, Deerfield Beach, Florida. | |
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| Bowen, W.J. and Kerwin, T.P. 1955. The purification of myokinase with an ion exchange resin. Biochem. Biophys. 57:522-524. | |
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| Cleland, W.W. 1979b. Substrate inhibition. Methods Enzymol. 63:500-513. | |
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| Klotz, I.M. 1983. Number of receptor sites from Scatchard and Klotz graphs: A constructive critique. Science 220:981. | |
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| McClure, W.R. 1969. A kinetic analysis of coupled enzyme assays. Bio Chem. 8:2782-2786. | |
| Nordlie, R.C. 1982. Kinetic examination of enzyme mechanisms involving branched reaction pathways: A detailed consideration of multifunctional glucose-6-phosphatase. Methods Enzymol. 87:319-353. | |
| O'Sullivan, W.J. and Smithers, G.W. 1979. Stability constants for biologically important metal-ligand complexes. Methods Enzymol. 63:294-336. | |
| Purich, D.L. and Fromm, H.J. 1972. Inhibition of rabbit muscle adenylate kinase by the transition state analogue, P | |
| Rudolph, F.B. 1979. Product inhibition and abortive complex formation. Methods Enzymol. 63:411-436. | |
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| Siano, D.B., Zyskind, J.W., and Fromm, H.J. 1975. A computer program for fitting and statistically analyzing initial rate data applied to bovine hexokinase type III isozyme. Arch. Biochem. Biophys. 170:587-600. | |
| Silverstein, E. and Sulebele, G. 1969. Catalytic mechanism of pig heart mitochondrial malate dehydrogenase studied by kinetics at equilibrium. Biochemistry 8:2543-2550. | |
| Storer, A.C. and Cornish-Bowden, A. 1974. The kinetics of coupled enzyme reactions. Biochem. J. 141:205-209. | |
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| Williams, J.W. and Morrison, J.F. 1979. The kinetics of reversible tight-binding inhibition. Methods Enzymol. 63:437-467. | |
| Key References | |
| Bergmeyer, 1983. See | |
| Detailed collection of enzyme assay protocols and methods for a wide variety of enzymes, including descriptions of many special techniques: e.g., fluorometry, turbidimetry, luminometry, and microtechniques. | |
| Dixon, M. and Webb, E.C. 1979. Enzymes, 3rd ed. Academic Press, New York. | |
| Classic text on the basics of enzymology; Chapter 4 deals specifically with enzyme kinetics. | |
| Fromm, H.J. 1975. Initial Rate Enzyme Kinetics. Springer-Verlag, New York. | |
| Valuable introductory text with considerable details on experimental design. | |
| Kuby, S.A. 1990. A Study of Enzymes,vol. I. CRC Press, Boca Raton, Florida | |
| Detailed text on steady-state kinetics. Contains useful chapters on the effects of metal cofactors and transient phase kinetics. | |
| Purich, D.L. (ed.) 1979. Enzyme kinetics and mechanism, part A. Methods Enzymol. Vol. 63. | |
| Describes a variety of initial rate methods and inhibitor studies for characterizing enzyme-catalyzed reactions. | |
| Purich, D.L. (ed.) 1980. Enzyme kinetics and mechanism, part B. Methods Enzymol. Vol. 64. | |
| Describes a number of isotopic probes for studying enzyme mechanisms and contains valuable chapters on allosterism, hysteresis, immobilized systems, and processivity. | |
| Purich, D. L. (ed.) 1982. Enzyme kinetics and mechanism, part C. Methods Enzymol. Vol. 87. | |
| Describes methods for characterizing intermediates in enzyme-catalyzed reactions and using stereochemical probes for enzyme mechanisms; includes additional initial-rate and inhibitor methods and discusses further uses of isotopic probes. | |
| Purich, D.L. (ed.) 1995. Enzyme kinetics and mechanism, part D. Methods in Enzymol. 249:3-662. | |
| Covers in detail specialized topics in enzyme kinetics including transition-state approaches, kinetic probes with site-directed mutagenesis, partition analysis, positional isotope exchange, interfacial catalysis, and hydrogen tunneling. | |
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This unit (Unit 3.5) of Current Protocols in Protein Science explains a lot of great basic information about enzyme kinetic assays, how to design and execute them, what they can and can't tell you, etc. If you have a more specific question, please write back and let us know. Good luck!
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