In the case of the mutants d8-60a, d8-60b, d8-60c, all three gene

In the case of the mutants d8-60a, d8-60b, d8-60c, all three generated identical length PCR products by this method indicating identical deletion

end points. Membrane protein analysis The outer membrane proteins (OMPs) were extracted as previously described [35] using equal number of cells selleck kinase inhibitor (equivalent to 5 ml of cells diluted to an OD600 of 5.0). The membrane pellet was resuspended in 200 μl of SDS sample buffer containing 5 mM tributylphosphine and 20 mM acrylamide for reduction and alkylation of proteins [36]. The solubilized proteins were diluted 1:5 in SDS sample buffer and 5 μl subject to polyacrylamide gel electrophoresis using a Criterion XT precast gel (4-12% Bis-Tris; Bio-Rad). Protein gels were stained with Flamingo protein stain (Bio-Rad) and imaged using a Pharos FX Plus Molecular Imager (Bio-Rad).

Flamingo stained protein gels were post-stained with colloidal Coomassie G-250 stain and proteins of interest excised for identification by LC-MS/MS as previously described [37]. PEAKS software (Bioinformatics Solutions Inc.) was used to directly search peptides against a protein sequence FASTA output derived from the V. rotiferianus DAT722 genome [12]. The highest PEAKS score (percentage based on a p-value < 0.05) was taken as the closest peptide match. The full sequence of identified proteins is given in the additional file 1. Acknowledgements This work was supported by a grant from the National Health and Medical Research Council of Australia. ML is supported by an ithree Institute Postdoctoral Fellowship. Electronic supplementary material Additional file 1: lists the full sequence of outermembrane proteins that showed changes in concentration between wild type DAT722 and the mutant d8-60a under particular growth conditions. Proteins were identified

via LC-MS/MS analysis as described in the methods. (DOC 48 KB) References 1. Hall RM, Brookes DE, Stokes HW: Site-specific insertion of genes into integrons: role of the 59-base element and determination of the recombination cross-over point. Mol Microbiol 1991, 5:1941–1959.PubMedCrossRef 2. Boucher Y, Labbate M, Koenig JE, Stokes HW: Integrons: mobilizable platforms that promote genetic diversity Erastin datasheet in bacteria. Trends in Microbiol 2007, 15:301–309.CrossRef 3. Labbate M, Case RJ, Stokes HW: The integron/gene cassette system: an active player in bacterial adaptation. In Horizontal gene transfer. Edited by: Gogarten MB, Gogarten JP, Olendzenski LC. Humana Press; 2009:103–125.CrossRef 4. Thompson FL, Iida T, Swings J: Biodiversity of vibrios. Microbiol Mol Biol Rev 2004, 68:403–431.PubMedCrossRef 5. Meibom KL, Blokesch M, Dolganov NA, Wu C-Y, Schoolnik GK: Chitin induces natural competence in Vibrio cholerae . Science 2005, 310:1824–1827.PubMedCrossRef 6.

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