| RRC ID |
35322
|
| Author |
Kim J, Kershner JP, Novikov Y, Shoemaker RK, Copley SD.
|
| Title |
Three serendipitous pathways in E. coli can bypass a block in pyridoxal-5'-phosphate synthesis.
|
| Journal |
Mol Syst Biol
|
| Abstract |
Bacterial genomes encode hundreds to thousands of enzymes, most of which are specialized for particular functions. However, most enzymes have inefficient promiscuous activities, as well, that generally serve no purpose. Promiscuous reactions can be patched together to form multistep metabolic pathways. Mutations that increase expression or activity of enzymes in such serendipitous pathways can elevate flux through the pathway to a physiologically significant level. In this study, we describe the discovery of three serendipitous pathways that allow synthesis of pyridoxal-5'-phosphate (PLP) in a strain of E. coli that lacks 4-phosphoerythronate (4PE) dehydrogenase (PdxB) when one of seven different genes is overexpressed. We have characterized one of these pathways in detail. This pathway diverts material from serine biosynthesis and generates an intermediate in the normal PLP synthesis pathway downstream of the block caused by lack of PdxB. Steps in the pathway are catalyzed by a protein of unknown function, a broad-specificity enzyme whose physiological role is unknown, and a promiscuous activity of an enzyme that normally serves another function. One step in the pathway may be non-enzymatic.
|
| Volume |
6
|
| Pages |
436
|
| Published |
2010-11-30
|
| DOI |
10.1038/msb.2010.88
|
| PII |
msb201088
|
| PMID |
21119630
|
| PMC |
PMC3010111
|
| MeSH |
Carbohydrate Dehydrogenases / genetics
Carbohydrate Dehydrogenases / physiology
Epistasis, Genetic / physiology
Escherichia coli / enzymology
Escherichia coli / genetics*
Escherichia coli / growth & development
Escherichia coli / metabolism*
Escherichia coli Proteins / genetics
Escherichia coli Proteins / physiology
Gene Expression Regulation, Bacterial / drug effects
Gene Expression Regulation, Enzymologic / drug effects
Genes, Bacterial / physiology
Glucose / pharmacology
Metabolic Networks and Pathways / genetics*
Metabolic Networks and Pathways / physiology
Microbiological Techniques
Models, Biological
Organisms, Genetically Modified
Oxidoreductases / genetics
Oxidoreductases / metabolism
Pyridoxal Phosphate / biosynthesis*
Serine / biosynthesis
|
| IF |
8.991
|
| Times Cited |
69
|
|
WOS Category
|
BIOCHEMISTRY & MOLECULAR BIOLOGY
|
| Resource |
| Prokaryotes E. coli |
ME9062(BW25113)(Keio)
JW0890-KC
JW0051-KC
JW2548-KC
JW1630-KC |
