Proteomic analysis reveals responsive proteins of Vibrio parahaemolyticus on exposure to cationic antimicrobial peptides.
OBJECTIVE
To investigate whether Vibrio parahaemolyticus can sense and directly respond to the presence of cationic antimicrobial peptides (AMPs).


RESULTS
We performed proteomic methodologies to investigate the responsive proteins of V. parahaemolyticus on exposure to AMP Q6. Differential expression patterns of the outer membrane, inner membrane and cytoplasmic proteins (OMPs, IMPs and CPs) from the bacteria with or without Q6 treatment were obtained using two-dimensional gel electrophoresis (2-DE). Three OMPs (maltoporin, flagellin and OmpV), two IMPs (ATP synthase F1, alpha subunit; and OmpV) and three CPs (pyruvate dehydrogenase subunit E1, glyceraldehyde-3-phosphate dehydrogenase and inositol-5-monophosphate dehydrogenase) were identified using LC-ESI-Q-TOF MS/MS and Mascot program. Real-time quantitative polymerase chain reaction was also performed to determine the mRNA expression level of the target genes.


CONCLUSIONS
Our results suggested that V. parahaemolyticus may directly respond to AMPs through the upregulation of the efflux channel, increased yield of energy, effective repair of damaged membranes and downregulation of carbohydrate and nucleotide metabolism for energy preservation.


CONCLUSIONS
AMP-responsive proteins identified in the current study could serve as attractive targets for developing more effective antimicrobial agents.
Chiu
Y
Y
Graduate Institute of Biotechnology, College of Bioresources, National Ilan University, Ilan, Taiwan.
Kuo
T-Y
TY
Lin
C-C
CC
Chen
W-J
WJ
D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D023181:Antimicrobial Cationic Peptides / Q000737:chemistry / Q000494:pharmacology*; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D015870:Gene Expression / Q000187:drug effects; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D040901:Proteomics; D014736:Vibrio parahaemolyticus / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism
D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins