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@ARTICLE{Netzer:36935,
author = {Netzer, R. and Peters-Wendisch, P. and Eggeling, L. and
Sahm, H.},
title = {{C}o-metabolism of a {N}on-{G}rowth {S}ubstrate:
{L}-{S}erine {U}tilization by {C}orynebacterium glutamicum},
journal = {Applied and environmental microbiology},
volume = {70},
issn = {0099-2240},
address = {Washington, DC [u.a.]},
publisher = {Soc.},
reportid = {PreJuSER-36935},
pages = {7148 - 7155},
year = {2004},
note = {Record converted from VDB: 12.11.2012},
abstract = {Despite its key position in central metabolism, L-serine
does not support the growth of Corynebacterium glutamicum.
Nevertheless, during growth on glucose, L-serine is consumed
at rates up to 19.4 +/- 4.0 nmol min(-1) (mg [dry
weight])(-1), resulting in the complete consumption of 100
mM L-serine in the presence of 100 mM glucose and an
increased growth yield of about $20\%.$ Use of 13C-labeled
L-serine and analysis of cellularly derived metabolites by
nuclear magnetic resonance spectroscopy revealed that the
carbon skeleton of L-serine is mainly converted to
pyruvate-derived metabolites such as L-alanine. The sdaA
gene was identified in the genome of C. glutamicum, and
overexpression of sdaA resulted in (i) functional L-serine
dehydratase (L-SerDH) activity, and therefore conversion of
L-serine to pyruvate, and (ii) growth of the recombinant
strain on L-serine as the single substrate. In contrast,
deletion of sdaA decreased the L-serine cometabolism rate
with glucose by $47\%$ but still resulted in degradation of
L-serine to pyruvate. Cystathionine beta-lyase was
additionally found to convert L-serine to pyruvate, and the
respective metC gene was induced 2.4-fold under high
internal L-serine concentrations. Upon sdaA overexpression,
the growth rate on glucose is reduced $36\%$ from that of
the wild type, illustrating that even with glucose as a
single substrate, intracellular L-serine conversion to
pyruvate might occur, although probably the weak affinity of
L-SerDH (apparent Km, 11 mM) prevents substantial L-serine
degradation.},
keywords = {Bacterial Proteins: genetics / Bacterial Proteins:
metabolism / Carbon Isotopes: metabolism / Corynebacterium
glutamicum: growth $\&$ development / Corynebacterium
glutamicum: metabolism / Culture Media / Gene Deletion /
Glucose: metabolism / L-Serine Dehydratase: genetics /
L-Serine Dehydratase: metabolism / Magnetic Resonance
Spectroscopy / Oligonucleotide Array Sequence Analysis /
Serine: metabolism / Bacterial Proteins (NLM Chemicals) /
Carbon Isotopes (NLM Chemicals) / Culture Media (NLM
Chemicals) / Glucose (NLM Chemicals) / Serine (NLM
Chemicals) / L-Serine Dehydratase (NLM Chemicals) / J
(WoSType)},
cin = {IBT-1},
ddc = {570},
cid = {I:(DE-Juel1)VDB55},
pnm = {Biotechnologie},
pid = {G:(DE-Juel1)FUEK256},
shelfmark = {Biotechnology $\&$ Applied Microbiology / Microbiology},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:15574911},
pmc = {pmc:PMC535176},
UT = {WOS:000225719300026},
doi = {10.1128/AEM.70.12.7148-7155.2004},
url = {https://juser.fz-juelich.de/record/36935},
}