Use of the Saccharomyces cerevisiae endopolygalacturonase promoter to direct expression in Escherichia coli

• Published in: Journal of industrial microbiology & biotechnology Vol. 39; no. 7; pp. 1023 - 1029
• Main Authors: Gognies, S, Bahkali, A, Moslem, M, Belarbi, A
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.07.2012; Springer; Springer Nature B.V
• Subjects: 5' Flanking Region; Acids; aerobic conditions; Base Sequence; beta-galactosidase; beta-Galactosidase - genetics; Biochemistry; Bioinformatics; Biological and medical sciences; Biomedical and Life Sciences; Biosynthesis; Biotechnology; E coli; Environmental Microbiology; Enzymes; Escherichia coli; Escherichia coli - genetics; Fundamental and applied biological sciences. Psychology; Gene expression; Gene Expression Regulation; genes; Genetic Engineering; Gluconates - metabolism; Glucose; glycosidic linkages; hosts; hydrolysis; Inorganic Chemistry; Laboratories; Life Sciences; Microbiology; Molecular Sequence Data; Plasmids; polygalacturonase; Polygalacturonase - genetics; Promoter Regions, Genetic; protein synthesis; researchers; Saccharomyces cerevisiae; Saccharomyces cerevisiae - enzymology; Saccharomyces cerevisiae - genetics; sequence analysis; transcription (genetics); Yeast; yeasts; Endopolygalacturonase; Dual expression plasmid; Gene expression; gene; Ascomycota; Yeast; Saccharomlyces cerevisiae; Escherichia coli; Fungi; Plasmid; Gene; PGLI gene; Bacteria; Saccharomyces cerevisiae; Enterobacteriaceae
• ISSN: 1367-5435; 1476-5535
• DOI: 10.1007/s10295-012-1108-y

In Saccharomyces cerevisiae, an endopolygalacturonase encoded by the PGL1 gene catalyzes the random hydrolysis of the α-1,4 glycosidic linkages in polygalacturonic acid. To study the regulation of the PGL1 gene, we constructed a reporter vector containing the lacZ gene under the control of PGL1 promoter. Surprisingly, when Escherichia coli DH5α was transformed by this vector, cells harboring the constructed plasmid produced blue colonies. Sequence analysis of this promoter revealed that E. coli consensus sequences required to express an in-frame lacZ alpha product were present. We next decided to investigate how the PGL1 promoter is regulated in E. coli compared to yeast. In this study, we examined the modulation of the PGL1 promoter in E. coli, and the results indicated that its activity is greatly induced by saturated digalacturonic acid and is indirectly regulated by the transcriptional regulators the 2-keto-3-deoxygluconate repressor. Moreover, PGL1 expression is enhanced under aerobic conditions. We found that β-galactosidase activity in E. coli could reach 180 units, which is 40-fold greater than the activity produced in S. cerevisiae, and greater than recombinant protein expression previously reported by other researchers. We thus demonstrate that this vector can be considered as a dual expression plasmid for both E. coli and S. cerevisiae hosts. So far, no modulation of endoPG promoters expressed in E. coli has been reported.