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Biophysical Journal 57: 689-696 (1990)
© 1990 the Biophysical Society

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Kinetics of a multistate enzyme in a large oscillating field.

B Robertson and R D Astumian

Chemical Process Metrology Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899.

ABSTRACT

A simple, general, and efficient method for calculating the response of a set of coupled first-order (or pseudo-first-order) chemical reactions to an arbitrarily large periodic field is described. The method is applied to a four-state membrane transport enzyme that is electroconformationally coupled to an ac field, i.e., the enzyme has electric charges that move concomitantly with a conformational transition. The calculation is done both for enzymes in a planar membrane and for enzymes in the spherical membrane of a cell or vesicle in suspension.






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Copyright © 1990 by the Biophysical Society.