Antibacterial activity of Rhynocoris marginatus (Fab.) and Catamirus brevipennis (Servile) (Hemiptera: reduviidae) venomS against human pathogens

Antibacterial activity of Rhynocoris marginatus (Fab.) and Catamirus brevipennis (Servile) (Hemiptera: reduviidae) venomS against human pathogens

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The reduviid predators Rhynocoris marginatus (Fab.) lovesense 3 and Catamirus brevipennis (Servile) use their venoms to paralyze their preys.We detected the antibacterial activity of R.marginatus and C.brevipennis venoms against seven Gram-negative and four Gram-positive bacteria by using the disc diffusion method.

Rhynocoris marginatus venom exhibited antibacterial activity against four Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Salmonella typhimurium) and one Gram-positive (Streptococcus pyogenes).Catamirus brevipennis venom showed antibacterial activity against six Gram-negative (Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa, Klebsiella pneumoniae, Proteus vulgaris, and Salmonella typhimurium) and three Gram-positive (Bacillus subtilis, Staphylococcus aureus, and Bacillus sphaericus) bacteria.Both C.brevipennis (90.91%) and R.

marginatus (45.45%) venoms were more effective against Gram-negative bacteria seattle seahawks socks (80% and 70% for R.marginatus and C.brevipennis, respectively).The venoms of both reduviid predators are composed of low molecular weight proteins (7-33 kD).