PMID: 9182699Jun 1, 1997Paper

Expression of an exogenous isopentenyl diphosphate isomerase gene enhances isoprenoid biosynthesis in Escherichia coli

The Biochemical Journal
S KajiwaraN Misawa

Abstract

Escherichia coli expressing the Erwinia carotenoid biosynthesis genes, crtE, crtB, crtI and crtY, form yellow-coloured colonies due to the presence of beta-carotene. This host was used as a visible marker for evaluating regulatory systems operating in isoprenoid biosynthesis of E. coli. cDNAs enhancing carotenoid levels were isolated from the yeast Phaffia rhodozyma and the green alga Haematococcus pluvialis. Nucleotide sequence analysis indicated that they coded for proteins similar to isopentenyl diphosphate (IPP) isomerase of the yeast Saccharomyces cerevisiae. Determination of enzymic activity confirmed the identity of the gene products as IPP isomerases. The corresponding gene was isolated from the genomic library of S. cerevisiae based on its nucleotide sequence, and was confirmed to have the same effect as the above two IPP isomerase genes when introduced into the E. coli transformant accumulating beta-carotene. In the three E. coli strains carrying the individual exogenous IPP isomerase genes, the increases in carotenoid levels are comparable to the increases in IPP isomerase enzyme activity with reference to control strains possessing the endogenous gene alone. These results imply that IPP isomerase forms an influentia...Continue Reading

Citations

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