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Transient protein-protein interactions perturbE.colimetabolome and cause gene dosage toxicity
- Source :
- eLife, Vol 5 (2016), eLife
- Publication Year :
- 2016
- Publisher :
- Cold Spring Harbor Laboratory, 2016.
-
Abstract
- Several genes exhibit gene dosage toxicity yet its molecular underpinnings remain unknown. Here we demonstrate that overexpression of DHFR inE. colicauses toxic metabolic imbalance triggered by interactions with several enzymes involved in 1-carbon metabolism, in particular GlyA and PurH. DHFR overexpression partially inhibits activity of these enzymes, but at physiological concentrations, PurH-DHFR interaction enhances catalytic efficiency of DHFR, implying a functional interactionin vivo. Surprisingly, overexpression of orthologous DHFRs from other bacterial species caused minimal metabolic and fitness perturbations, despite pulling out more interacting partners than overexpressed endogenous DHFR. Orthologous DHFRs were less potent in inhibitingE. coliGlyA and PurH, or gaining a catalytic improvement upon interaction with PurH, indicating a partial loss of interaction specificity due to evolutionary divergence. This study shows how protein overexpression perturbs a dynamic network of weak yet potentially functional PPI with consequences for the metabolic state of cells and their fitness.
- Subjects :
- 0301 basic medicine
Gene Dosage
protein-protein interactions
protein crowding in cytoplasm
Endogeny
Plasma protein binding
medicine.disease_cause
Protein Interaction Maps
Biology (General)
Genetics
chemistry.chemical_classification
0303 health sciences
Chemistry
Escherichia coli Proteins
General Neuroscience
030302 biochemistry & molecular biology
General Medicine
Biophysics and Structural Biology
Recombinant Proteins
Cell biology
Proteome
Metabolome
Medicine
Metabolon
Research Article
Computational and Systems Biology
Protein Binding
QH301-705.5
Science
Systems biology
Biology
Gene dosage
General Biochemistry, Genetics and Molecular Biology
gene dosage toxicity
Protein–protein interaction
03 medical and health sciences
parasitic diseases
Escherichia coli
medicine
Gene
030304 developmental biology
General Immunology and Microbiology
E. coli
Metabolism
Tetrahydrofolate Dehydrogenase
030104 developmental biology
Enzyme
Structural biology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- eLife, Vol 5 (2016), eLife
- Accession number :
- edsair.doi.dedup.....37e9efabb7b3d61525f5f7bb669ee90f