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Title: Systems-Wide Prediction of Enzyme Promiscuity Reveals a New Underground Alternative Route for Pyridoxal 5’-Phosphate Production in E. coli

Journal Article · · PLoS Computational Biology (Online)
 [1];  [2];  [3];  [4];  [5];  [2];  [4];  [2];  [6];  [2];  [1]
  1. Tel Aviv Univ., Tel Aviv (Israel); Univ. of Maryland, College Park, MD (United States)
  2. Tel Aviv Univ., Tel Aviv (Israel)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Inst. for Research in Biomedicine (IRB), Barcelona (Spain)
  6. Univ. of Maryland, College Park, MD (United States). Maryland Pathogen Research Institute

Recent insights suggest that non-specific and/or promiscuous enzymes are common and active across life. Understanding the role of such enzymes is an important open question in biology. Here we develop a genome-wide method, PROPER, that uses a permissive PSI-BLAST approach to predict promiscuous activities of metabolic genes. Enzyme promiscuity is typically studied experimentally using multicopy suppression, in which over-expression of a promiscuous ‘replacer’ gene rescues lethality caused by inactivation of a ‘target’ gene. We use PROPER to predict multicopy suppression in Escherichia coli, achieving highly significant overlap with published cases (hypergeometric p = 4.4e-13). We then validate three novel predicted target-replacer gene pairs in new multicopy suppression experiments. We next go beyond PROPER and develop a network-based approach, GEM-PROPER, that integrates PROPER with genome-scale metabolic modeling to predict promiscuous replacements via alternative metabolic pathways. GEM-PROPER predicts a new indirect replacer (thiG) for an essential enzyme (pdxB) in production of pyridoxal 5’-phosphate (the active form of Vitamin B6), which we validate experimentally via multicopy suppression. Here, we perform a structural analysis of thiG to determine its potential promiscuous active site, which we validate experimentally by inactivating the pertaining residues and showing a loss of replacer activity. Thus, this study is a successful example where a computational investigation leads to a network-based identification of an indirect promiscuous replacement of a key metabolic enzyme, which would have been extremely difficult to identify directly.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; European Union (EU)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1258643
Alternate ID(s):
OSTI ID: 1393162
Journal Information:
PLoS Computational Biology (Online), Vol. 12, Issue 1; ISSN 1553-7358
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Sensitive Genome-Wide Screen for Low Secondary Enzymatic Activities: The YjbQ Family Shows Thiamin Phosphate Synthase Activity journal February 2008
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Three serendipitous pathways in E. coli can bypass a block in pyridoxal‐5′‐phosphate synthesis journal January 2010
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A genome‐scale metabolic reconstruction for Escherichia coli K‐12 MG1655 that accounts for 1260 ORFs and thermodynamic information journal January 2007
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Development of CRISPR-Cas13a-based antimicrobials capable of sequence-specific killing of target bacteria journal June 2020
Auxotrophic and prototrophic conditional genetic networks reveal the rewiring of transcription factors in Escherichia coli journal July 2022
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Artificial gene amplification reveals an abundance of promiscuous resistance determinants in Escherichia coli journal December 2010
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Mutational Analysis of a Fatty Acyl-Coenzyme A Synthetase Signature Motif Identifies Seven Amino Acid Residues That Modulate Fatty Acid Substrate Specificity journal February 1997
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Network Context and Selection in the Evolution to Enzyme Specificity journal August 2012
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An in silico platform for the design of heterologous pathways in nonnative metabolite production journal January 2012
A retrosynthetic biology approach to metabolic pathway design for therapeutic production journal January 2011

Cited By (3)

Current status and applications of genome-scale metabolic models journal June 2019
A Survey of Pyridoxal 5′-Phosphate-Dependent Proteins in the Gram-Positive Model Bacterium Bacillus subtilis journal May 2019
Current status and applications of genome-scale metabolic models journal June 2019