采用改进的方法提取粘质沙雷氏菌基因组DNA,通过PCR扩增,得到大小为1500 bp特异性DNA片段(chiB基因),以pUC18质粒构建了pUC-chiB克隆载体,转化至感受态细胞E.coli DH5a培养,并筛选出重组质粒.经测序分析,证明克隆片段与文献报道相一致.

The genome DNA was extracted from serratia marcescens by improved method .A special fragment about 1 500 bp length was cloned from serratia marcescens genome DNA by Polymerasw Chain Reaction (PCR) amplification. Vector Puc-CHIb was constructed through ligating the fragment into the plasmid pUC18 and transformed into E. Coli DH5α. Through screening of recombinants and sequence analysis of it, the result showed that the cloned DNA fragment was chitinase chiB gene of Serratia marcescens which was the same as reported.