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J. Biol. Chem., Vol. 263, Issue 17, 8003-8010, Jun, 1988
MC Maiden, MC Jones-Mortimer and PJ Henderson
Department of Biochemistry, University of Cambridge, United Kingdom.
A lambda placMu1 insertion was made into araE, the gene for arabinose- proton symport in Escherichia coli. A phage containing an araE'-'lacZ fusion was recovered from the lysogen and its restriction map compared with that of the 61-min region of the E. coli genome to establish the gene order thyA araE orf lysR lysA galR; araE was transcribed toward orf. A 4.8-kilobase SalI-EcoRI DNA fragment containing araE was subcloned from the phage lambda d(lysA+ galR+ araE+) into the plasmid vector pBR322. From this plasmid a 2.8-kilobase HincII-PvuII DNA fragment including araE was sequenced and also subcloned into the expression vector pAD284. The araE gene was 1416-base pairs long, encoding a hydrophobic protein of 472 amino acids with a calculated Mr of 51,683. The amino acid sequence was homologous with the xylose- proton symporter of E. coli and the glucose transporters from a human hepatoma HepG2 cell line, human erythrocytes, and rat brain. The overexpressed araE gene product was identified in Coomassie-stained sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels of cell membranes as a protein of apparent Mr 35,000 +/- 1,150. Arabinose protected this protein against reaction with N-ethylmaleimide.
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