To construct a high-level expression of xylE gene in E. coli for quick detection of environmental pollution of aromatic compounds. Methods and Results: XylE gene coding for the catechol 2, 3 dioxygenase (CatO2ase ) wa...To construct a high-level expression of xylE gene in E. coli for quick detection of environmental pollution of aromatic compounds. Methods and Results: XylE gene coding for the catechol 2, 3 dioxygenase (CatO2ase ) was amplified from the recombinant plasmid pTG402 by using PCR technique and was subcloned into pUC118N and pUC119N. The single stranded recombinant phage DNA from the transformed E. coli MV1184 cells was used for sequencing. The sequence of xylE gene was proved to be the same as reported. The gene was then subcloned into the high expression plasmid pJLA503, its expression amount being about 34. 2% of the total bacterial proteins. Conclusion: xylE gene is highly expressed in host E. coli TG1.展开更多
A facile synthesis of piperonol is reported from catechol. Reacted catechol with excess dichloromethane in an autoclave under nitrogen atmosphere gave 88 4% 1,3-benzodioxole(1), which is directly chlo romethylated to ...A facile synthesis of piperonol is reported from catechol. Reacted catechol with excess dichloromethane in an autoclave under nitrogen atmosphere gave 88 4% 1,3-benzodioxole(1), which is directly chlo romethylated to yield 90 1% 5-chloromethyl 1,3-benzodioxole(2) by hydrogen chloride saturated triformol. 2 can easily convert to piperonal by treatment with alcoholic solution of Na 2CO 3 in yield of 97 7%. The total yield is 78%.展开更多
文摘To construct a high-level expression of xylE gene in E. coli for quick detection of environmental pollution of aromatic compounds. Methods and Results: XylE gene coding for the catechol 2, 3 dioxygenase (CatO2ase ) was amplified from the recombinant plasmid pTG402 by using PCR technique and was subcloned into pUC118N and pUC119N. The single stranded recombinant phage DNA from the transformed E. coli MV1184 cells was used for sequencing. The sequence of xylE gene was proved to be the same as reported. The gene was then subcloned into the high expression plasmid pJLA503, its expression amount being about 34. 2% of the total bacterial proteins. Conclusion: xylE gene is highly expressed in host E. coli TG1.
文摘A facile synthesis of piperonol is reported from catechol. Reacted catechol with excess dichloromethane in an autoclave under nitrogen atmosphere gave 88 4% 1,3-benzodioxole(1), which is directly chlo romethylated to yield 90 1% 5-chloromethyl 1,3-benzodioxole(2) by hydrogen chloride saturated triformol. 2 can easily convert to piperonal by treatment with alcoholic solution of Na 2CO 3 in yield of 97 7%. The total yield is 78%.
