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2017 ; 14
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Control and regulation of pathways via negative feedback
#MMPMID28202588
Sauro HM
J R Soc Interface
2017[Feb]; 14
(127
): ä PMID28202588
show ga
The biochemical networks found in living organisms include a huge variety of
control mechanisms at multiple levels of organization. While the mechanistic and
molecular details of many of these control mechanisms are understood, their exact
role in driving cellular behaviour is not. For example, yeast glycolysis has been
studied for almost 80 years but it is only recently that we have come to
understand the systemic role of the multitude of feedback and feed-forward
controls that exist in this pathway. In this article, control theory is discussed
as an approach to dissect the control logic of complex pathways. One of the key
issues is distinguishing between the terms control and regulation and how these
concepts are applied to regulated enzymes such as phosphofructokinase. In doing
so, one of the paradoxes in metabolic regulation can be resolved where enzymes
such as phosphofructokinase have little control but, nevertheless, possess
significant regulatory influence.