Xiangyu Pi, Yang Xu, Yiwen Cao, Qihuan Zhang, Zisheng Wang, Z. Qi
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引用次数: 0
Abstract
Melanoma differentiation-associated gene 5 (MDA5) and the laboratory of genetics and physiology 2 (LGP2) are family members of retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs), which play important roles in the immune response against pathogens invasion. In the present study, MDA5 and LGP2 genes were identified in largemouth bass (Micropterus salmoides), a fish species with a great economic value. The two proteins contained similar conserved domains and motifs as their counterparts of other vertebrates, including the DExDc domain (the DEAD/DEAH box helicases domain), HELICc domain (helicases superfamily domain), and regulatory domain (RD). Real-time qPCR revealed that the two genes were constitutively expressed in tissues of healthy fish and could be induced in the spleen by polyinosinic and polycytidylic acid (polyI:C) challenge in vivo. Also, selective pressure analysis revealed that the negative selection had roles in the evolutions of the two genes. Furthermore, the dsRNA binding mechanism of msLGP2 and msMDA5 were analyzed by the molecular docking strategy. The amino acids of msLGP2 involved in dsRNA binding were V604, N663, L682, and L684, which were located in the regulatory domain (RD) of msLGP2. The amino acids of msMDA5 involved in dsRNA binding were G429, H434, L842, and L845, which were located in the DExDc domain and the RD domain of msMDA5. These results indicated that fish LGP2 and MDA5 might share similar functions and ligand binding mechanism as their mammalian counterparts.
期刊介绍:
International in perspective, Aquaculture Research is published 12 times a year and specifically addresses research and reference needs of all working and studying within the many varied areas of aquaculture. The Journal regularly publishes papers on applied or scientific research relevant to freshwater, brackish, and marine aquaculture. It covers all aquatic organisms, floristic and faunistic, related directly or indirectly to human consumption. The journal also includes review articles, short communications and technical papers. Young scientists are particularly encouraged to submit short communications based on their own research.