Infectious diseases are a significant cause of morbidity and mortality worldwide, accounting for approximately
50% of all deaths in tropical countries and as much as 20% of deaths in the USA. The emergence of multi-drug resistant
(MDR) strains makes the risk of these infections even more threatening and an important public health problem thereby
increasing need of new agents for fighting pathogens. In this review, the remarkable antibacterial properties possessed by
various snake venoms (Crotalide, Elapidae, and Viperidae families) were discussed and in particular phospholipase A2s
(PLA2s) that have emerged from various studies as potential in the last few years. Group IIA PLA2s are the most potent
among the snake venom (sv)PLA2s against various types of bacteria. Further, antibacterial derivatives from PLA2s, e.g.
peptides derived from the C-terminal sequence of Lys49-PLA2s (amino acids 115-129), kill bacteria and cause severe
membrane-damaging effects. Mechanisms of binding to the bacterial surface and subsequent killing by peptides are based
on positive charge, hydrophobicity, and length. These peptide candidates are easy to design and synthesize in pure form
(~95% purity). Such peptides may be potentially useful in the clinic as new antimicrobials for combating infections due to
antibiotic-resistant bacteria that include methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant
Enterococcus in the near future.
Keywords: Methicillin-resistant Staphylococcus aureus (MRSA), snake venom protein, endogenous antibiotics, Lys49 &
Asp49-PLA2, inflammatory cytokines, growth factors, skin, wound healing, transcription factors NF-kB, Cys-rich protein.
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