Sensitivity analysis of metabolic cascades catalyzed by bifunctional enzymes.

Abstract:

:Covalent modification/demodification cycles are common in metabolism. When the modification and demodification steps are carried out by two independent enzymes, the degree of modification can be ultrasensitive to the total concentration of either catalyst. We recently showed that the degree of modification of a target molecule cannot exhibit ultrasensitivity to the free concentrations of effectors that decide whether a bifunctional enzyme acts as modifier or demodifier. However, here we can now demonstrate that the degree of modification of a target molecule can display ultrasensitivity to the total, rather than free, concentrations of such effectors. Our results clarify some general aspects of ultrasensitive responses to effectors, including competitive inhibitors, in mono-cyclic cascades.

journal_name

Mol Biol Rep

authors

Ortega F,Ehrenberg M,Acerenza L,Westerhoff HV,Mas F,Cascante M

doi

10.1023/a:1020334014497

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

211-5

issue

1-2

eissn

0301-4851

issn

1573-4978

journal_volume

29

pub_type

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