title: The cloning, DNA sequence, and overexpression of the gene araE coding for arabinose-proton symport in Escherichia coli K12.
abstract: 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.
authors.affiliation: Department of Biochemistry, University of Cambridge, United Kingdom.
authors.forename: M C
authors.initials: MC
authors.lastname: Maiden
authors.forename: M C
authors.initials: MC
authors.lastname: Jones-Mortimer
authors.forename: P J
authors.initials: PJ
authors.lastname: Henderson
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics*; D003001:Cloning, Molecular; D004247:DNA / Q000032:analysis*; D004262:DNA Restriction Enzymes / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins; D005033:Ethylmaleimide / Q000378:metabolism; D005786:Gene Expression Regulation; D008565:Membrane Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D010641:Phenotype; D014158:Transcription, Genetic
chemical_list: C016242:AraF protein, E coli; D001426:Bacterial Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D008565:Membrane Proteins; D004247:DNA; D004262:DNA Restriction Enzymes; D005033:Ethylmaleimide