Molecular characterization, transcriptional profiling, and antibacterial potential of G-type lysozyme from seahorse (Hippocampus abdominalis) SCIE SCOPUS

Cited 16 time in WEB OF SCIENCE Cited 19 time in Scopus
Title
Molecular characterization, transcriptional profiling, and antibacterial potential of G-type lysozyme from seahorse (Hippocampus abdominalis)
Author(s)
Ko, Jiyeon; Wan, Qiang; Bathige, S. D. N. I.; Lee, Jehee
Publication Year
2016-11
Abstract
Lysozymes are a family of enzymes that catalyze the hydrolysis of bacterial cell wall, acting as antimicrobial effectors of the innate immune system. In the present study, an ortholog of goose-type lysozyme (ShLysG) from the big-belly seahorse (Hippocampus abdominalis) was identified and characterized structurally and functionally. The full-length cDNA sequence (1213 bp) of ShLysG is comprised of an open reading frame made up of 552 bp, encoding a polypeptide of 184 amino acid (aa) with a predicted molecular mass of 20 kDa. In silico analysis of ShLysG revealed the absence of signal peptide and the presence of a characteristic bacterial soluble lytic transglycosylase (SLT) domain bearing three catalytic residues (Glu(71). Asp(84), and Asp(95)) and seven N-acetyl-o-glucosamine binding sites (Glu(71), Asp(95), Tyr(98), His(99), Ile(117), Tyr(145), and Asn(146)). Homology analysis demonstrated that the aa sequence of ShLysG shared 60.7-67.4% identity and 72.6-79.3% similarity with the orthologs of other teleosts. Phylogenetic analysis of ShLysG indicated a closest relationship with the ortholog from Gadus morhua. In healthy seahorse, ShLysG mRNA showed a constitutive expression in all the tissues examined, with the highest expression in kidney and the least expression in liver. The ShLysG mRNA levels were also shown significant elevation upon the bacterial and pathogen-associated molecular pattern (PAMPs) challenges. Furthermore, lytic activities of ShLysG recombinant protein were detected against several Gram-negative and Gram-positive bacterial species. Taken together, these results suggest that ShLysG might possess a potential immune defensive role against invading microbial pathogens in seahorse. (C) 2016 Elsevier Ltd. All rights reserved.
ISSN
1050-4648
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2267
DOI
10.1016/j.fsi.2016.10.014
Bibliographic Citation
FISH & SHELLFISH IMMUNOLOGY, v.58, pp.622 - 630, 2016
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Subject
GOOSE-TYPE LYSOZYME; ORANGE-SPOTTED GROUPER; RECOMBINANT PROTEIN; LYTIC ACTIVITY; CHICKEN-TYPE; EGG-WHITE; EXPRESSION; GENE; INFECTION; CLONING
Keywords
Big-belly seahorse; Lysozyme; Tissue specific mRNA expression; Immune defense; Antibacterial activity
Type
Article
Language
English
Document Type
Article
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
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