[Recombinant expression and secretion of mpd gene using the promoters and signal peptide-encoding sequences of ytkA and ywoF gene from Bacillus subtilis].
A shuttle promoter-probe vector pNW33N-mpd was constructed with the E. coli-B. subtilis shuttle vector pNW33N and the mature mpd gene without it' s signal peptide-encoding sequence. The promoter fragments of B. subtilis ytkA and ywoF gene were cloned from plasmid pMPDP3 and pMPDP29 then generated the shuttle expression vector pNYTM and pNYWM. Expression vectors pNYTM and pNYWM were transformed into B. subtilis 1A751 to construct the expression strain 1A751 (pNYTM) and 1A751 (pNYTM), in these strains, under the control of the promoters and signal peptides of ytkA and ywoF gene, mpd gene was expressed and secreted with its biological activity; the result showed that the promoter of ytkA gene is much stronger than that of ywoF gene. Then a new shuttle expression-secretion vector pYNMK was constructed using the ytkA gene promoter and the signal peptide-encoding sequence of B. subtilis nprB gene, the expression of mpd gene achieved a higher level using the B. subtilis WB800 as the host, the methyl parathion hydrolase activity accumulated to a maximum level of 10.40 u/mL after 84 h of cultivation at the late stationary phase, which was 10.8-fold higher than the expression level of the original Plesiomonas strain M6, about 91.4% of the recombinant expression production was secreted into the culture medium.
Zhang
Xiao-Zhou
XZ
Key Laboratory for Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China.
Yan
Xin
X
Cui
Zhong-Li
ZL
Li
Shun-Peng
SP
D001412:Bacillus subtilis / Q000235:genetics*; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005798:Genes, Bacterial; D005822:Genetic Vectors; D010744:Phosphoric Monoester Hydrolases / Q000096:biosynthesis / Q000235:genetics*; D011401:Promoter Regions, Genetic; D021382:Protein Sorting Signals / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics
D001426:Bacterial Proteins; D021382:Protein Sorting Signals; D011993:Recombinant Fusion Proteins; C495424:methyl parathion hydrolase, Pseudomonas; D010744:Phosphoric Monoester Hydrolases