Abstract
Vibrio parahaemolyticus, a Gram-negative bacterium, inhabits marine and estuarine environments and it is a major pathogen responsible globally for most cases of seafood-associated gastroenteritis in humans and acute hepatopancreatic necrosis syndrome in shrimps. There has been a dramatic worldwide increase in V. parahaemolyticus infections over the last two decades. The pathogenicity of V. parahaemolyticus has been linked to the expression of different kinds of virulence factors including extracellular proteases, such as metalloproteases and serine proteases. V. parahaemolyticus expresses the metalloproteases; PrtV, VppC, VPM and the serine proteases; VPP1/Protease A, VpSP37, PrtA. Extracellular proteases have been identified as potential virulence factors which directly digest many kinds of host proteins or indirectly are involved in the processing of other toxic protein factors. This review summarizes findings on the metalloproteases and serine proteases produced by V. parahaemolyticus and their roles in infections. Identifying the role of V. parahaemolyticus virulence-associated extracellular proteases deepens our understanding of diseases caused by this bacterium.
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