pubmed-article:11120644 | rdf:type | pubmed:Citation | lld:pubmed |
pubmed-article:11120644 | lifeskim:mentions | umls-concept:C0004611 | lld:lifeskim |
pubmed-article:11120644 | lifeskim:mentions | umls-concept:C0014279 | lld:lifeskim |
pubmed-article:11120644 | lifeskim:mentions | umls-concept:C0032136 | lld:lifeskim |
pubmed-article:11120644 | lifeskim:mentions | umls-concept:C0311400 | lld:lifeskim |
pubmed-article:11120644 | lifeskim:mentions | umls-concept:C0884358 | lld:lifeskim |
pubmed-article:11120644 | pubmed:issue | 4 | lld:pubmed |
pubmed-article:11120644 | pubmed:dateCreated | 2001-2-13 | lld:pubmed |
pubmed-article:11120644 | pubmed:abstractText | Multicopy plasmids are often chosen for the expression of recombinant genes in Escherichia coli. The high copy number is generally desired for maximum gene expression; however, the metabolic burden effects that usually result from multiple plasmid copies could prove to be detrimental for maximum productivity in certain metabolic engineering applications. In this study, low-copy mini-F plasmids were compared to high-copy pMB1-based plasmids for production of two metabolites in E. coli: polyphosphate (polyP) and lycopene derived from isopentenyl diphosphate (IPP). The stationary-phase accumulation of polyP on a per cell basis was enhanced approximately 80% when either high- or low-copy plasmids were used, from 120 micromol/g DCW without augmented polyP kinase (PPK) activity to approximately 220 micromol/g DCW. The cell density of the high-copy plasmid-containing culture at stationary phase was approximately 24% lower than the low-copy culture and 30% lower than the control culture. This difference in cell density is likely a metabolic burden effect and resulted in a lower overall product concentration for the high-copy culture (approximately 130 micromol/L culture) relative to the low-copy culture (approximately 160 micromol/L culture). When the gene for DXP (1-deoxy-D-xylulose 5-phosphate) synthase, the first enzyme in the IPP mevalonate-independent biosynthetic pathway, was expressed from the tac promoter on multicopy and low-copy plasmids, lycopene production was enhanced two- to threefold over that found in cells expressing the chromosomal copy only. Cell growth and lycopene production decreased substantially when isopropyl beta-D-thiogalactosidase (IPTG) was added to the high-copy plasmid-containing culture, suggesting that overexpression of DXP synthase was a significant metabolic burden. In the low-copy plasmid-containing culture, no differences in cell growth or lycopene production were observed with any IPTG concentrations. When dxs was placed under the control of the arabinose-inducible promoter (P(BAD)) on the low-copy plasmid, the amount of lycopene produced was proportional to the arabinose concentration and no significant changes in cell growth resulted. These results suggest that low-copy plasmids may be useful in metabolic engineering applications, particularly when one or more of the substrates used in the recombinant pathway are required for normal cellular metabolism. | lld:pubmed |
pubmed-article:11120644 | pubmed:language | eng | lld:pubmed |
pubmed-article:11120644 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:11120644 | pubmed:citationSubset | IM | lld:pubmed |
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pubmed-article:11120644 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:11120644 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:11120644 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
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pubmed-article:11120644 | pubmed:status | MEDLINE | lld:pubmed |
pubmed-article:11120644 | pubmed:month | Oct | lld:pubmed |
pubmed-article:11120644 | pubmed:issn | 1096-7176 | lld:pubmed |
pubmed-article:11120644 | pubmed:author | pubmed-author:KimS WSW | lld:pubmed |
pubmed-article:11120644 | pubmed:author | pubmed-author:JonesK LKL | lld:pubmed |
pubmed-article:11120644 | pubmed:author | pubmed-author:KeaslingJ DJD | lld:pubmed |
pubmed-article:11120644 | pubmed:issnType | Print | lld:pubmed |
pubmed-article:11120644 | pubmed:volume | 2 | lld:pubmed |
pubmed-article:11120644 | pubmed:owner | NLM | lld:pubmed |
pubmed-article:11120644 | pubmed:authorsComplete | Y | lld:pubmed |
pubmed-article:11120644 | pubmed:pagination | 328-38 | lld:pubmed |
pubmed-article:11120644 | pubmed:dateRevised | 2006-11-15 | lld:pubmed |
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pubmed-article:11120644 | pubmed:year | 2000 | lld:pubmed |
pubmed-article:11120644 | pubmed:articleTitle | Low-copy plasmids can perform as well as or better than high-copy plasmids for metabolic engineering of bacteria. | lld:pubmed |
pubmed-article:11120644 | pubmed:affiliation | Department of Chemical Engineering, University of California, Berkeley, California 94720-1462, USA. | lld:pubmed |
pubmed-article:11120644 | pubmed:publicationType | Journal Article | lld:pubmed |
entrez-gene:945060 | entrezgene:pubmed | pubmed-article:11120644 | lld:entrezgene |
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