Mar 7, 2020

A fibrinogen-related protein (Mnfico3) acts as a novel pattern recognition receptor in Macrobrachium nipponense

Fish & Shellfish Immunology
Nan QinFengsong Liu

Abstract

Fibrinogen-related proteins (FREPs) are widely found in both vertebrates as well as invertebrates, and they play a crucial role in host immunity. In this study, we isolated a novel ficolin gene (Mnfico3) from the oriental river prawn Macrobrachium nipponense. The complete cDNA sequence of Mnfico3 was 1133 bp long, containing an open reading frame of 765 bp coding for Mnfico3, a protein consisting of 254 amino acids. The Mnfico3 protein contained a putative N-terminal signal peptide and a fibrinogen-related protein domain present at the C-terminal. Phylogenetic analysis indicated that Mnfico3 had a closer evolutionary relationship with vertebrate ficolins than with its invertebrate homologues. Tissue distribution analysis indicated that Mnfico3 was predominantly expressed in muscle, in which its transcription was increased following bacterial challenge by Aeromonas veronii. Function analysis using recombinant protein revealed that rMnFico3 had broad-spectrum binding capacity to a variety of microorganisms and pathogen-associated molecular pattern (PAMP) ligands. Furthermore, rMnFico3 exhibited Ca2+-dependent agglutinating activity against microbes in vitro, and ability to attach to the hemocyte surface which promoted phagocytosi...Continue Reading

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Mentioned in this Paper

Ficolin
Analysis
In Vivo
RNA Interference
Orientation (spatial)
Gene Silencing
ACKR4
Open Reading Frames
Study
Receptors, Pattern Recognition

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