Molecular analysis of the scrA and scrB genes from Klebsiella pneumoniae and plasmid pUR400 which encode the sucrose transport protein Enzyme IIScr of the phosphotransferase system and a sucrose-6-phosphate invertase

Autor(en): Titgemeyer, F
Jahreis, K
Ebner, R
Lengeler, JW
Stichwörter: BACILLUS-SUBTILIS; Biochemistry & Molecular Biology; ENTERIC BACTERIA; ESCHERICHIA-COLI K-12; Genetics & Heredity; invertase; MEMBRANE TOPOLOGY; METABOLISM; NUCLEOTIDE-SEQUENCE; PHOSPHOENOLPYRUVATE; phosphotransferase system (PTS); SACA GENE; STAPHYLOCOCCUS-XYLOSUS; SUCRASE GENE; sucrose metabolism; transporter
Erscheinungsdatum: 1996
Herausgeber: SPRINGER
Volumen: 250
Ausgabe: 2
Startseite: 197
Seitenende: 206
The Klebsiella pneumoniae genes scrA and scrB are indispensable for sucrose (Scr) utilisation. Gene scrA codes for an Enzyme IIScr (IIScr) transport protein of the phosphoenolpyruvate-dependent carbohydrate: phosphotransferase system (PTS), while scrB encodes a sucrose 6-phosphate specific invertase. A 3.7 kb scrAB DNA fragment has been cloned from K. pneumoniae and expressed in Escherichia coli. Its nucleotide sequence was determined and the coding regions for scrA (1371 bp) and scrB (1401 bp) were identified by genetic complementation, enzyme activity tests and radiolabelling of the gene products. In addition, the nucleotide sequence of the scrB gene from the conjugative plasmid pUR400 isolated from Salmonella typhimurium was also determined and errors in the previously published sequence of the scrA gene of pUR400 were corrected. Extensive similarity was found between the sequences of ScrA and other Enzymes II, as well as between the two invertases and other sucrose hydrolysing enzymes. Based on the analysis of seven IIScr proteins, a hypothetical model of the secondary structure of IIScr is proposed.
ISSN: 00268925

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