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ERIC Number: EJ913310
Record Type: Journal
Publication Date: 2010-Mar
Pages: 3
Abstractor: As Provided
Reference Count: 11
ISBN: N/A
ISSN: ISSN-0021-9584
The Effect of Temperature on the Enzyme-Catalyzed Reaction: Insights from Thermodynamics
Aledo, Juan Carlos; Jimenez-Riveres, Susana; Tena, Manuel
Journal of Chemical Education, v87 n3 p296-298 Mar 2010
When teaching the effect of temperature on biochemical reactions, the problem is usually oversimplified by confining the thermal effect to the catalytic constant, which is identified with the rate constant of the elementary limiting step. Therefore, only positive values for activation energies and values greater than 1 for temperature coefficients ("Q"[subscript 10], defined as the rate change that parallels a 10 [degree]C temperature shift) can be expected. We show why this approach, which is appropriate under saturation conditions, is unsuitable for those enzymes working at subsaturating concentrations of their substrates. To overcome this limitation, we present and discuss a simple thermokinetic treatment of the Michaelis-Menten model for the enzyme-catalyzed reaction. (Contains 1 figure.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A