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. 1987 Sep;169(9):4349–4354. doi: 10.1128/jb.169.9.4349-4354.1987

Cloning of the ADPglucose pyrophosphorylase (glgC) and glycogen synthase (glgA) structural genes from Salmonella typhimurium LT2.

P S Leung, J Preiss
PMCID: PMC213751  PMID: 3040690

Abstract

The structural genes of ADPglucose pyrophosphorylase (glgC) and glycogen synthase (glgA) from Salmonella typhimurium LT2 were cloned on a 5.8-kilobase-pair insert in the SalI site of pBR322. A single strand specific radioactive probe containing the N terminus of the Escherichia coli K-12 glgC gene in M13mp8 was used to hybridize against a S. typhimurium genomic library in lambda 1059. DNA from a plaque showing a positive hybridization signal was isolated, subcloned into pBR322, and transformed into E. coli K-12 RR1 and E. coli G6MD3 (a mutant with a deletion of the glg genes). Transformants were stained with iodine for the presence of glycogen. E. coli K-12 RR1 transformants stained dark brown, whereas G6MD3 transformants stained greenish yellow, and they both were shown to contain a 5.8-kilobase-pair insert in the SalI site of pBR322, designated pPL301. Enzyme assays of E. coli K-12 G6MD3 harboring pPL301 restored ADPglucose pyrophosphorylase and glycogen synthase activities. The specific activities of ADPglucose pyrophosphorylase and glycogen synthase in E. coli K-12 RR1(pPL301) were increased 6- to 7-fold and 13- to 15-fold, respectively. Immunological and kinetic studies showed that the expressed ADPglucose pyrophosphorylase activity in transformed E. coli K-12 G6MD3 cells was very similar to that of the wild-type enzyme.

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Selected References

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