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at Related Biological Terms:

catabolism

The action of energy-yielding metabolic pathways that degrade macromolecules and complex compounds or small molecules into CO2, H2O, etc. (see also amphibolic pathway; anabolism)

catabolite

A degradation product derived from a more complex compound. (see also anabolite)

catabolite activation

(see glucose effect)

catabolite repression

(see glucose effect)

catalytic DNA

(see ribozyme)

catalytic antibody (abzyme)

An antibody with catalytic properties; often raised against a hapten that chemically resembles the transition state of the intended substrate so as to force a substrate into that transition state. Hilvert, D. (1994) Curr. Opin. Struct. Biol. 4, 612-617; Jacobsen, J.R. and Schultz, P.G. (1995) Curr. Opin. Struct. Biol. 5, 818-824

catalytic configuration

(see entropy effect)

catalytic rate constant (kcat)

The first-order rate constant that describes the rate-limiting step in enzyme catalysis, usually the conversion of the enzyme-substrate complex into the enzyme-product complex; the maximal velocity divided by the enzyme concentration. (see also turnover number (catalytic-centre activity))

catalytic site

The region of an enzyme that interacts with the substrate to effect the enzymic reaction.

catalytic subunit

(see regulatory subunit)

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