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. 1989 Nov;171(11):6300–6306. doi: 10.1128/jb.171.11.6300-6306.1989

Cloning and nucleotide sequence of braC, the structural gene for the leucine-, isoleucine-, and valine-binding protein of Pseudomonas aeruginosa PAO.

T Hoshino 1, K Kose 1
PMCID: PMC210503  PMID: 2509433

Abstract

The gene for the leucine-, isoleucine-, and valine-binding protein (LIVAT-BP) in Pseudomonas aeruginosa PAO was isolated, and its nucleotide sequence was determined. The gene consisted of 1,119 nucleotides specifying a protein of 373 amino acid residues. Determination of the N-terminal amino acid sequence of the LIVAT-BP purified from P. aeruginosa shock fluid suggested that the N-terminal 26 residues of the gene product are cleaved off posttranslationally, showing the characteristic features of procaryotic signal peptides. The amino acid composition of the mature product predicted from the nucleotide sequence was in good agreement with that of the purified LIVAT-BP. The plasmid carrying the LIVAT-BP gene restored the activity of the high-affinity branched-chain amino acid transport system (the leucine, isoleucine, valine [LIV-I] transport system) in the braC310 mutant of P. aeruginosa, confirming that braC is the structural gene for LIVAT-BP. The mutant LIVAT-BP lacking a 16-amino-acid peptide in the middle was found to be functional in the LIV-I transport system. LIVAT-BP showed extensive homology (51% identical) to the LIV- and leucine-specific-binding proteins of Escherichia coli K-12, which are coded for by the livJ and livK genes, respectively, suggesting that the role of the proteins in the LIV-I transport systems is analogous in both organisms.

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Selected References

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