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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Cloning, nucleotide sequences, and identification of products of the Pseudomonas aeruginosa PAO bra genes, which encode the high-affinity branched-chain amino acid transport system.

A DNA fragment of Pseudomonas aeruginosa PAO containing genes specifying the high-affinity branched-chain amino acid transport system (LIV-I) was isolated. The fragment contained the braC gene, encoding the binding protein for branched-chain amino acids, and the 4-kilobase DNA segment adjacent to 3' of braC. The nucleotide sequence of the 4-kilobase DNA fragment was determined and found to contain four open reading frames, designated braD, braE, braF, and braG. The braD and braE genes specify very hydrophobic proteins of 307 and 417 amino acid residues, respectively. The braD gene product showed extensive homology (67% identical) to the livH gene product, a component required for the Escherichia coli high-affinity branched-chain amino acid transport systems. The braF and braG genes encode proteins of 255 and 233 amino acids, respectively, both containing amino acid sequences typical of proteins with ATP-binding sites. By using a T7 RNA polymerase/promoter system together with plasmids having various deletions in the braDEFG region, the braD, braE, braF, and braG gene products were identified as proteins with apparent Mrs of 25,500, 34,000, 30,000, and 27,000, respectively. These proteins were found among cell membrane proteins on a sodium dodecyl sulfate-polyacrylamide gel stained with Coomassie blue.[1]

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