Gene identification and antimicrobial activity analysis of a novel lysozyme from razor clam Sinonovacula constricta.

Autor: Guo M; School of Marine Sciences, Ningbo University, Ningbo, 315211, PR China., Wang H; School of Marine Sciences, Ningbo University, Ningbo, 315211, PR China., Shao Y; School of Marine Sciences, Ningbo University, Ningbo, 315211, PR China., Xing R; College of Life Sciences, Yantai University, Yantai, 264005, PR China., Zhao X; School of Marine Sciences, Ningbo University, Ningbo, 315211, PR China., Zhang W; School of Marine Sciences, Ningbo University, Ningbo, 315211, PR China., Li C; School of Marine Sciences, Ningbo University, Ningbo, 315211, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, PR China. Electronic address: lichenghua@nbu.edu.cn.
Jazyk: angličtina
Zdroj: Fish & shellfish immunology [Fish Shellfish Immunol] 2019 Jun; Vol. 89, pp. 198-206. Date of Electronic Publication: 2019 Apr 01.
DOI: 10.1016/j.fsi.2019.03.077
Abstrakt: Lysozymes are important immune effectors present in phylogenetically diverse organisms. They play vital roles in bacterial elimination during early immune responses. In the present study, a second invertebrate-type (i-type) lysozyme gene from razor clam Sinonovacula constricta (denoted as ScLYZ-2) was cloned by RACE and nested PCR methods. The full-length cDNA sequences of ScLYZ-2 were 1558 bp, including a 5' untranslated region (UTR) of 375 bp, an open reading frame of 426 bp, and a 3'-UTR of 757 bp with polyadenylation signal sequence (AATAAA) located upstream of the poly(A) tail. SMART analysis showed that ScLYZ-2 contains a signal peptide in the first 16 amino acid (AA) sequences and a destabilase domain located from 24 to 134 AA sequences. The deduced AA sequences of ScLYZ-2 were highly similar (42%-58%) to other known lysozyme genes of bivalve species. Multiple alignments of AA sequences showed that ScLYZ-2 possesses the classical i-type lysozyme family signature of two motifs ["MDVGSLSCGP(Y/F)QIK" and "CL(E/L/R/H)C(I/M)C"] and two catalytic residues (Glu 35 and Asp 46 ). Moreover, phylogenetic analysis showed that ScLYZ-2 is a new member of the i-type lysozyme family. In healthy razor clams, ScLYZ-2 was highly expressed in the hepatopancreas, followed by the gills, water pipes, and abdominal foot. Lysozyme activity and ScLYZ-2 expression levels were significantly upregulated in the hepatopancreas and gills after being infected with V. splendidus, V. harveyi, V. parahaemolyticus and S. aureus and M. luteus. Moreover, the recombinant ScLYZ-2 had strong antimicrobial activities against V. splendidus, V. harveyi, and V. parahaemolyticus. Furthermore, the minimal inhibitory concentration of the recombinant ScLYZ-2 against V. parahaemolyticus was 7.2 μmol/mL. Taken together, our results show that ScLYZ-2 plays an important role in the immune defense of razor clam by eliminating pathogenic microorganisms.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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