The partial genomic library of Saccharomyce cerevisiae FL189 possessing strong flocculation ability was constructed using Yeast-E.coli shuttle plasmid YCp50 as vector.Recombinant plasmid containing flocculation gene w...The partial genomic library of Saccharomyce cerevisiae FL189 possessing strong flocculation ability was constructed using Yeast-E.coli shuttle plasmid YCp50 as vector.Recombinant plasmid containing flocculation gene was obtained by screening the growth of transformants on the selective medium and measurement flocculation,designated as pCF1.pCF1 was introduced into industrial yeast strain PJ208-5-15.Six transformants PJ208-5-15-1(pCF1)～PJ208-5-15-6(pCF1)possessing strong flocculation ability were obtained.The results of Southern blot and restriction endonuclease analysis showed that the insert is about 4.3kb and could hybridize with the probe (2.6kb EcoRV fragment of FLO1).Flocculation ability assay indicated that the transformants possess strong flocculation ability.Hence,the gene controlling flocculation phenotype exists in the cloned DNA fragment.The restriction endonuclease analysis and the sequence analysis of the insert DNA fragment are in progress.展开更多
The sequence of the flocculation gene (FLO1G) was determined. The result of sequcencing showed that:the cloned gene contains a large open reading frame (ORF) of 3936 bp and encodes for a protein of 1312 amino acid. Ac...The sequence of the flocculation gene (FLO1G) was determined. The result of sequcencing showed that:the cloned gene contains a large open reading frame (ORF) of 3936 bp and encodes for a protein of 1312 amino acid. According to the result of homologous analysis, the cloned gene is homologous to FLO1 but with 675 bp deletion in the ORF region. The missing part belongs to one of the four repeated sequence family of FLO1. Since the cloned DNA fragment can trigger strong flocculence to non-flocculent strain S.cerevisiae YS58, we concluded that the missing part is not the crutical part for the flocculent ability of the gene.展开更多
文摘The partial genomic library of Saccharomyce cerevisiae FL189 possessing strong flocculation ability was constructed using Yeast-E.coli shuttle plasmid YCp50 as vector.Recombinant plasmid containing flocculation gene was obtained by screening the growth of transformants on the selective medium and measurement flocculation,designated as pCF1.pCF1 was introduced into industrial yeast strain PJ208-5-15.Six transformants PJ208-5-15-1(pCF1)～PJ208-5-15-6(pCF1)possessing strong flocculation ability were obtained.The results of Southern blot and restriction endonuclease analysis showed that the insert is about 4.3kb and could hybridize with the probe (2.6kb EcoRV fragment of FLO1).Flocculation ability assay indicated that the transformants possess strong flocculation ability.Hence,the gene controlling flocculation phenotype exists in the cloned DNA fragment.The restriction endonuclease analysis and the sequence analysis of the insert DNA fragment are in progress.
文摘The sequence of the flocculation gene (FLO1G) was determined. The result of sequcencing showed that:the cloned gene contains a large open reading frame (ORF) of 3936 bp and encodes for a protein of 1312 amino acid. According to the result of homologous analysis, the cloned gene is homologous to FLO1 but with 675 bp deletion in the ORF region. The missing part belongs to one of the four repeated sequence family of FLO1. Since the cloned DNA fragment can trigger strong flocculence to non-flocculent strain S.cerevisiae YS58, we concluded that the missing part is not the crutical part for the flocculent ability of the gene.
