The self-inhibitory nature of metabolic networks and its alleviation through compartmentalization
Artikel i vetenskaplig tidskrift, 2017

Metabolites can inhibit the enzymes that generate them. To explore the general nature of metabolic self-inhibition, we surveyed enzymological data accrued from a century of experimentation and generated a genome-scale enzyme-inhibition network. Enzyme inhibition is often driven by essential metabolites, affects the majority of biochemical processes, and is executed by a structured network whose topological organization is reflecting chemical similarities that exist between metabolites. Most inhibitory interactions are competitive, emerge in the close neighbourhood of the inhibited enzymes, and result from structural similarities between substrate and inhibitors. Structural constraints also explain one-third of allosteric inhibitors, a finding rationalized by crystallographic analysis of allosterically inhibited L-lactate dehydrogenase. Our findings suggest that the primary cause of metabolic enzyme inhibition is not the evolution of regulatory metabolite-enzyme interactions, but a finite structural diversity prevalent within the metabolome. In eukaryotes, compartmentalization minimizes inevitable enzyme inhibition and alleviates constraints that self-inhibition places on metabolism.

Fructose 2

Pyruvate-Kinase

Substrate

Escherichia-Coli

Lactate-Dehydrogenase

Glycolysis

Triosephosphate Isomerase

Enzyme Function

Yeast

Genome

6-Bisphosphate

Bacillus-Subtilis

Författare

M. T. Alam

The University of Warwick

University of Cambridge

V. Olin-Sandoval

University of Cambridge

Instituto Nacional de la Nutricion Salvador Zubiran

A. Stincone

Discuva Ltd.

University of Cambridge

M. A. Keller

University of Cambridge

Medizinische Universität Innsbruck

Aleksej Zelezniak

Chalmers, Biologi och bioteknik, Systembiologi

B. F. Luisi

University of Cambridge

M. Ralser

The Francis Crick Institute

University of Cambridge

Nature Communications

2041-1723 (ISSN)

Vol. 8 Article no 16018- 16018

Ämneskategorier

Biokemi och molekylärbiologi

DOI

10.1038/ncomms16018

Mer information

Senast uppdaterat

2020-11-13