Title

Neuronal Nitric Oxide Synthase: Prototype for Pulsed Enzymology

Department

Molecular & Cellular Biology

Document Type

Article

Publication Date

4-2008

Abstract

The established paradigm in understanding and describing enzyme activity uses formalisms based on steady-state assumptions, including Michaelis-Menten and King-Altman approaches. These are appropriate for enzymes operating under steady-state conditions. Signal generating enzymes transfer information, rather than material. Because the information capacity of a signal channel depends on frequency, steady-state descriptions may not be appropriate. Recently, Stuehr and coworkers described a novel product inhibition mechanism for NO synthases. Simulations presented here suggest that at physiological temperatures neuronal nitric oxide synthase produces sharp pulses of NO, consistent with its signaling function. These temporal pulses greatly restrict the effective spatial range of NO signaling.

Journal

FEBS Letters

Journal ISSN

1873-3468

Volume

582

Issue

10

First Page

1395

Last Page

1399

Digital Object Identifier (DOI)

10.1016/j.febslet.2008.03.051