| 摘要 |
<p>A gene having a DNA sequence complementary to that of the glucoamylase polypeptide mRNA from a fungal species, preferably Asperigillus awamori, is prepared. The mRNA is an approximately 2.2 kilobase poly A RNA obtained from fungal cells grown under conditions of glucoamylase induction. Reverse transcription of the small mRNA provides a glucoamylase probe used to identify genomic digest fragments containing glucoamylase gene regions, which are sequenced to locate the introns and exons. The genomic fragments are spliced together to form a gene having a DNA sequence with altered or deleted introns which codes for fungal glucoamylase protein and is capable, when correctly combined with a cleaved DNA expression vector, of expressing a non-native protein having glucoamylase enzyme activity upon transformation of a host organism by the vector. The host is preferably bacteria or yeast. The transformed yeast host may be used to produce ethanol. </p> |
