The Marsupenaeus japonicus voltage-dependent anion channel (MjVDAC) protein is involved in white spot syndrome virus (WSSV) pathogenesis

Abstract

Voltage-dependent anion channel (VDAC) proteins abound in the outer membrane of mitochondria. They play an important role in mitochondrial membrane permeabilization (MMP), which can lead to stress-induced cellular apoptosis and necrosis. Several pathogens regulate this MMP in their host cells to benefit their replication cycle, while in other cases, the host can use the same mechanism to combat pathogenesis. In this study, the first shrimp VDAC gene was identified and characterized from Marsupenaeus japonicus (MjVDAC). Its open reading frame (ORF) contained 849 bp encoding 282 amino acids. The deduced MjVDAC protein includes the 4-element eukaryotic porin signature motif, the conserved ATP binding motif (the GLK motif) and a VKAKV-like sequence known in other organisms to be involved in the protein's incorporation in the mitochondrial outer membrane. Tissue tropism analysis indicated that MjVDAC is abundant in the heart, muscle, stomach and pleopod. MjVDAC proteins colocalized with mitochondria in transiently transfected Sf9 cells and in shrimp hemocytes. dsRNA silencing of shrimp VDAC delayed white spot syndrome virus (WSSV) infection by 1 day in different shrimp organs. Taken together, these findings suggest that MjVDAC is likely to be involved in WSSV pathogenesis.