Abstract
ABSTRACTTranscriptome analyses have previously revealed that a gene encoding the putative amino acid transporter CtrA (YhdG) is one of the major targets of the pleiotropic regulator CodY inLactococcus lactisandBacillus subtilis. The role ofctrAinL. lactiswas further investigated with respect to both transport activity as well as CodY-mediated regulation. CtrA is required for optimal growth in media containing free amino acids as the only amino acid source. Amino acid transport studies showed thatctrAencodes a secondary amino acid transport system that is specific for branched-chain amino acids (BCAAs) (isoleucine, leucine, and valine) and methionine, which is in disagreement with its previously proposed function (a cationic amino acid transporter), which was assigned based on homology. We propose to rename CtrA BcaP, for branched-chain amino acid permease. BcaP is a member of a group of conserved transport systems, as homologs are widely distributed among gram-positive bacteria. Deletion ofbcaPresulted in the loss of most of the BCAA uptake activity ofL. lactis, indicating that BcaP is the major BCAA carrier of this organism. Deletion ofbcaPtogether with a second (putative) BCAA permease, encoded bybrnQ, further reduced the viability of the strain. DNA microarray analysis showed that deletion ofbcaPpredominantly affects genes belonging to the regulons of the transcriptional regulator CodY, which is involved in global nitrogen metabolism and needs BCAAs for its activation, and of CmbR, which is involved in sulfur amino acid metabolism.
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Dates
Type | When |
---|---|
Created | 19 years, 4 months ago (April 18, 2006, 1:20 a.m.) |
Deposited | 1 year, 7 months ago (Feb. 3, 2024, 2:48 p.m.) |
Indexed | 1 year, 1 month ago (July 24, 2024, 4 a.m.) |
Issued | 19 years, 4 months ago (May 1, 2006) |
Published | 19 years, 4 months ago (May 1, 2006) |
Published Print | 19 years, 4 months ago (May 1, 2006) |
@article{den_Hengst_2006, title={Identification and Functional Characterization of theLactococcus lactisCodY-Regulated Branched-Chain Amino Acid Permease BcaP (CtrA)}, volume={188}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.188.9.3280-3289.2006}, DOI={10.1128/jb.188.9.3280-3289.2006}, number={9}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={den Hengst, Chris D. and Groeneveld, Maarten and Kuipers, Oscar P. and Kok, Jan}, year={2006}, month=may, pages={3280–3289} }