THIS BOOK collects together papers given at a NATO Advanced Research
Workshop held at Il Ciocco (Lucca), Italy, from the 9th to the 15th
April, 1989. It sets out to present the current state of understanding
of the principles governing the way fluxes and concentrations are
maintained and controlled in metabolic systems. Although this is a topic
that has held the interest of biochemists for many years, it is only
quite recently that the methods of analysing the kinetics of
multi-enzyme pathways developed over the past two decades have come to
be widely discussed or applied experimentally. Many biochemists remain
sceptical that the new methods offer a real advance (except in
complexity) over the landmark discoveries of the 1950s and 1960s
relating to inhibition of enzymes at branch-points by the end products
of metabolic pathways, and the interpretation of allosteric effects and
cooperativity. Even those who have become convinced that the classical
ideas provide only the starting point for understanding metabolic
control have been by no means unanimous in their assess- ment of the
direction in which one should advance. In this book we have tried to
include all of the current points of view, including the view that the
classical theories tell us all that we need to know. We have not seen it
as our role as editors to paper over the cracks that exist and to
pretend that we can speak to the world with one voice.