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After the establishment of the transformation conditions of Streptomyces diastaticus No.7 Strain M1033,the integration plasmid pXW for homologous recombination,which contains a 600 bp fragment of incomplete GI (G138P.G247D) gene,has been constructed in order to realize the stable overexpression of the GI (G138P.G247D) which is valuable for large-scale industrial production.The Gigene's disruption has been realized by pXW's integration into M1033 chromosomes via homologous recombination and GI deficient strain of Streptomyces M1033 has been obtained.The reliability of introduction of mutation has been proved by analysis of recombinant fragment and affirmance of existence of the mutation,as well as detection of the stability of the deficient strain.