Molecular characterization of peptidoglycan recognition proteins from Mytilus coruscus. Issue 131 (December 2022)

• Record Type: Journal Article
• Authors: Liao, Zhi; Yang, Zongxin; Wang, Ying; He, Jianyu; He, Zhijiang; Zhang, Xiaolin; Buttino, Isabella; Qi, Pengzhi; Fan, Meihua; Guo, Baoying; Yan, Xiaojun; He, Menglan
• Is Part Of: Fish & shellfish immunology. Issue 131(2022)
• Page Start: 612
• Page End: 623
• Publication Date: 2022-12
• Subjects: Mytilus coruscus -- Peptidoglycan recognition protein -- Expression profile -- Immune response; Fishes -- Immunology -- Periodicals; Shellfish -- Immunology -- Periodicals; Poissons -- Immunologie -- Périodiques; Crustacés -- Immunologie -- Périodiques; 571.9617
• DOI: 10.1016/j.fsi.2022.10.018
• Languages: English
• ISSNs: 1050-4648

Abstract

Abstract: Mytilus shows great immune resistance to various bacteria from the living waters, indicating a complex immune recognition mechanism against various microbes. Peptidoglycan recognition proteins (PGRPs) play an important role in the defense against invading microbes via the recognition of the immunogenic substance peptidoglycan (PGN). Therefore, eight PGRPs were identified from the gill transcriptome of Mytilus coruscus . The sequence features, expression pattern in various organs and larval development stages, and microbes induced expression profiles of these Mytilus PGRPs were determined. Our data revealed the constitutive expression of PGRPs in various organs with relative higher expression level in immune-related organs. The expression of PGRPs is developmentally regulated, and most PGRPs are undetectable in larvae stages. The expression level of most PGRPs was significantly increased with in vivo microbial challenges, showing strong response to Gram-positive strain in gill and digestive gland, strong response to Gram-negative strain in hemocytes, and relative weaker response to fungus in the three tested organs. In addition, the function analysis of the representative recombinant expressed PGRP (rMcPGRP-2) confirmed the antimicrobial and agglutination activities, showing the immune-related importance of PGRP in Mytilus . Our work suggests that Mytilus PGRPs can act as pattern recognition receptors to recognize the invading microorganisms and the antimicrobial effectors during the innate immune response of Mytilus . Highlights: Eight PGRP genes were identified from the gill transcriptome of M. coruscus . The expression profiles of the eight Mytilus PGRP genes were determined. McPGRPs showed different responses to different in vivo microbial challenges. Recombinant McPGRP-2 showed classical PGRP functions.