An Aeromonas salmonicida gene which influences a-protein expression in Escherichia coli encodes a protein containing an ATP-binding cassette and maps beside the surface array protein gene.
A conserved Aeromonas salmonicida gene (abcA) affecting expression of the surface array protein gene (vapA) in Escherichia coli was identified. The 924-bp gene starts 205 bp after vapA and codes for a protein with a deduced molecular weight (M(r)) of 34,015 containing an N-terminal P-loop and significant homology to the ATP-binding cassette transport protein superfamily. AbcA was identified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) by using T7 polymerase expression and DNA-directed translation and was copurified with the sarkosyl-soluble cytoplasmic membrane fraction. The protein displayed aberrant migration during SDS-PAGE. A lacZ fusion containing 128 bp of upstream sequence and 387 bases in the 5' end of abcA was constructed, and the beta-galactosidase activity of the abcA-lacZ fusion gene was shown to be similar in E. coli and A. salmonicida. The 130,000-M(r) AbcA-LacZ fusion protein was purified, and by using an ATP affinity column, the 129 AbcA N-terminal P-loop-containing residues were shown to bind ATP.
Department of Biochemistry and Microbiology, University of Victoria, British Columbia, Canada.
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D018528:ATP-Binding Cassette Transporters; D000255:Adenosine Triphosphate / Q000378:metabolism*; D000333:Aeromonas / Q000235:genetics*; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000302:isolation & purification; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D005798:Genes, Bacterial / Q000235:genetics*; D007763:Lac Operon / Q000235:genetics; D008562:Membrane Glycoproteins / Q000096:biosynthesis*; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000302:isolation & purification; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic; D037521:Virulence Factors
D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D011993:Recombinant Fusion Proteins; D037521:Virulence Factors; C081168:abcA protein, Aeromonas salmonicida; D000255:Adenosine Triphosphate