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Background   Vibrio parahaemolyticus  is a Gram-negative halophilic bacterium which is found largely in estuarine and coastal waters. The bacteria has been a main focus in gastro-intestinal infections caused primarily due to the consumption of contaminated seafood. It was shown to survive in magnesium concentrations as high as 300 mM which are toxic to various other micro-organisms. Several genes of  V. parahaemolyticus  were studied, among which gbpA (N-acetyl glucosamine binding protein) was reported in  Vibrio cholerae .    Methods  The current study investigates the  V. parahaemolyticus  gbpA gene expression at different concentrations of magnesium sulfate heptahydrate (MgSO 4 ·7H 2 O, chosen as the magnesium environment), in the presence of the host’s (prawn) carapace and the mimicked carapace [commercial chitin flakes (Sigma)]. The concentrations of MgSO 4 ·7H 2 O utilized were approximately 0, 1, 75, 137, 225 and 300 mM. These were selected based upon the survival conditions required by prawn and bacteria, respectively. 0.05 gm/3 ml of carapace (by dry weight) and commercial chitin flakes were used in the experiments. Bacterial count was performed for the biological triplicates for the 3 experimental setups. The genome of  Vibrio parahaemolyticus  PCV08-7 (VPPCV08-7) was used as a reference, based on whose translated gbpA gene the probable protein-chemical interactions were determined on the STITCH database.    Results  The GbpA protein was shown to interact with chitin on the STITCH database. In our experiments, the gbpA showed lower gene expression levels at different MgSO 4 ·7H 2 O concentrations in the presence of chitin and carapace, than with the presence of only MgSO 4 •7H 2 O. In addition, the bacterial count for various concentrations of magnesium used, revealed a distinct decrease in bacterial count within and among each of the three experimental setups.    Conclusion  In the presence of only magnesium, an increase in the gbpA expression with neither chitin nor carapace and vice versa supported by the results from the bacterial counts could help further studies to prove that the moulting phase of prawns may trigger increased expression of the  V. parahaemolyticus  gbpA gene.    Electronic supplementary material  The online version of this article (doi:10.1186/s13099-016-0105-5) contains supplementary material, which is available to authorized users.

gut pathogens

Host, pathogen and environment: a bacterial gbpA gene expression study in response to magnesium environment and presence of prawn carapace and commercial chitin