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 Repjournal_title
Molecular biology reportsauthors
Ortega F,Ehrenberg M,Acerenza L,Westerhoff HV,Mas F,Cascante Mdoi
10.1023/a:1020334014497keywords:
subject
Has Abstractpub_date
2002-01-01 00:00:00pages
211-5issue
1-2eissn
0301-4851issn
1573-4978journal_volume
29pub_type
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