Identification of a serine proteinase homolog (Sp-SPH) involved in immune defense in the mud crab Scylla paramamosain

Clip domain serine proteinase homologs are involved in many biological processes including immune response. To identify the immune function of a serine proteinase homolog (Sp-SPH), originally isolated from hemocytes of the mud crab, Scylla paramamosain, the Sp-SPH was expressed recombinantly and pur...

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Veröffentlicht in:PloS one 2013-05, Vol.8 (5), p.e63787-e63787
Hauptverfasser: Zhang, Qiu-xia, Liu, Hai-peng, Chen, Rong-yuan, Shen, Kai-li, Wang, Ke-jian
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Wang, Ke-jian
description Clip domain serine proteinase homologs are involved in many biological processes including immune response. To identify the immune function of a serine proteinase homolog (Sp-SPH), originally isolated from hemocytes of the mud crab, Scylla paramamosain, the Sp-SPH was expressed recombinantly and purified for further studies. It was found that the Sp-SPH protein could bind to a number of bacteria (including Aeromonas hydrophila, Escherichia coli, Staphylococcus aureus, Vibrio fluvialis, Vibrio harveyi and Vibrio parahemolyticus), bacterial cell wall components such as lipopolysaccharide or peptidoglycan (PGN), and β-1, 3-glucan of fungus. But no direct antibacterial activity of Sp-SPH protein was shown by using minimum inhibitory concentration or minimum bactericidal concentration assays. Nevertheless, the Sp-SPH protein was found to significantly enhance the crab hemocyte adhesion activity (paired t-test, P
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To identify the immune function of a serine proteinase homolog (Sp-SPH), originally isolated from hemocytes of the mud crab, Scylla paramamosain, the Sp-SPH was expressed recombinantly and purified for further studies. It was found that the Sp-SPH protein could bind to a number of bacteria (including Aeromonas hydrophila, Escherichia coli, Staphylococcus aureus, Vibrio fluvialis, Vibrio harveyi and Vibrio parahemolyticus), bacterial cell wall components such as lipopolysaccharide or peptidoglycan (PGN), and β-1, 3-glucan of fungus. But no direct antibacterial activity of Sp-SPH protein was shown by using minimum inhibitory concentration or minimum bactericidal concentration assays. Nevertheless, the Sp-SPH protein was found to significantly enhance the crab hemocyte adhesion activity (paired t-test, P&lt;0.05), and increase phenoloxidase activity if triggered by PGN in vitro (paired t-test, P&lt;0.05). Importantly, the Sp-SPH protein was demonstrated to promote the survival rate of the animals after challenge with A. hydrophila or V. parahemolyticus which were both recognized by Sp-SPH protein, if pre-incubated with Sp-SPH protein, respectively. Whereas, the crabs died much faster when challenged with Vibrio alginolyiicus, a pathogenic bacterium not recognized by Sp-SPH protein, compared to those of crabs challenged with A. hydrophila or V. parahemolyticus when pre-coated with Sp-SPH protein. 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This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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To identify the immune function of a serine proteinase homolog (Sp-SPH), originally isolated from hemocytes of the mud crab, Scylla paramamosain, the Sp-SPH was expressed recombinantly and purified for further studies. It was found that the Sp-SPH protein could bind to a number of bacteria (including Aeromonas hydrophila, Escherichia coli, Staphylococcus aureus, Vibrio fluvialis, Vibrio harveyi and Vibrio parahemolyticus), bacterial cell wall components such as lipopolysaccharide or peptidoglycan (PGN), and β-1, 3-glucan of fungus. But no direct antibacterial activity of Sp-SPH protein was shown by using minimum inhibitory concentration or minimum bactericidal concentration assays. Nevertheless, the Sp-SPH protein was found to significantly enhance the crab hemocyte adhesion activity (paired t-test, P&lt;0.05), and increase phenoloxidase activity if triggered by PGN in vitro (paired t-test, P&lt;0.05). Importantly, the Sp-SPH protein was demonstrated to promote the survival rate of the animals after challenge with A. hydrophila or V. parahemolyticus which were both recognized by Sp-SPH protein, if pre-incubated with Sp-SPH protein, respectively. Whereas, the crabs died much faster when challenged with Vibrio alginolyiicus, a pathogenic bacterium not recognized by Sp-SPH protein, compared to those of crabs challenged with A. hydrophila or V. parahemolyticus when pre-coated with Sp-SPH protein. Taken together, these data suggested that Sp-SPH molecule might play an important role in immune defense against bacterial infection in the mud crab S. paramamosain.</description><subject>Adhesion tests</subject><subject>Aeromonas hydrophila</subject><subject>Agriculture</subject><subject>Animals</subject><subject>Antibacterial activity</subject><subject>Bacteria</subject><subject>Bacteria - drug effects</subject><subject>Bacteria - metabolism</subject><subject>Bacterial infections</subject><subject>Biochemistry</subject><subject>Biological activity</subject><subject>Biology</subject><subject>Brachyura - drug effects</subject><subject>Brachyura - enzymology</subject><subject>Brachyura - immunology</subject><subject>Brachyura - microbiology</subject><subject>Cell Adhesion - drug effects</subject><subject>Cell Extracts</subject><subject>Cell walls</subject><subject>Cloning</subject><subject>Crabs</subject><subject>Crustaceans</subject><subject>Decapoda</subject><subject>Drosophila</subject><subject>E coli</subject><subject>Earth science</subject><subject>Electrophoresis, Polyacrylamide Gel</subject><subject>Environmental science</subject><subject>Escherichia coli</subject><subject>Fungi - 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drug effects</topic><topic>Bacteria - metabolism</topic><topic>Bacterial infections</topic><topic>Biochemistry</topic><topic>Biological activity</topic><topic>Biology</topic><topic>Brachyura - drug effects</topic><topic>Brachyura - enzymology</topic><topic>Brachyura - immunology</topic><topic>Brachyura - microbiology</topic><topic>Cell Adhesion - drug effects</topic><topic>Cell Extracts</topic><topic>Cell walls</topic><topic>Cloning</topic><topic>Crabs</topic><topic>Crustaceans</topic><topic>Decapoda</topic><topic>Drosophila</topic><topic>E coli</topic><topic>Earth science</topic><topic>Electrophoresis, Polyacrylamide Gel</topic><topic>Environmental science</topic><topic>Escherichia coli</topic><topic>Fungi - drug effects</topic><topic>Fungi - metabolism</topic><topic>Glucan</topic><topic>Hemocytes</topic><topic>Hemocytes - cytology</topic><topic>Hemocytes - drug effects</topic><topic>Hemocytes - enzymology</topic><topic>Homology</topic><topic>Immune response</topic><topic>Immune system</topic><topic>Immunity - 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To identify the immune function of a serine proteinase homolog (Sp-SPH), originally isolated from hemocytes of the mud crab, Scylla paramamosain, the Sp-SPH was expressed recombinantly and purified for further studies. It was found that the Sp-SPH protein could bind to a number of bacteria (including Aeromonas hydrophila, Escherichia coli, Staphylococcus aureus, Vibrio fluvialis, Vibrio harveyi and Vibrio parahemolyticus), bacterial cell wall components such as lipopolysaccharide or peptidoglycan (PGN), and β-1, 3-glucan of fungus. But no direct antibacterial activity of Sp-SPH protein was shown by using minimum inhibitory concentration or minimum bactericidal concentration assays. Nevertheless, the Sp-SPH protein was found to significantly enhance the crab hemocyte adhesion activity (paired t-test, P&lt;0.05), and increase phenoloxidase activity if triggered by PGN in vitro (paired t-test, P&lt;0.05). Importantly, the Sp-SPH protein was demonstrated to promote the survival rate of the animals after challenge with A. hydrophila or V. parahemolyticus which were both recognized by Sp-SPH protein, if pre-incubated with Sp-SPH protein, respectively. Whereas, the crabs died much faster when challenged with Vibrio alginolyiicus, a pathogenic bacterium not recognized by Sp-SPH protein, compared to those of crabs challenged with A. hydrophila or V. parahemolyticus when pre-coated with Sp-SPH protein. Taken together, these data suggested that Sp-SPH molecule might play an important role in immune defense against bacterial infection in the mud crab S. paramamosain.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23724001</pmid><doi>10.1371/journal.pone.0063787</doi><oa>free_for_read</oa></addata></record>
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subjects Adhesion tests
Aeromonas hydrophila
Agriculture
Animals
Antibacterial activity
Bacteria
Bacteria - drug effects
Bacteria - metabolism
Bacterial infections
Biochemistry
Biological activity
Biology
Brachyura - drug effects
Brachyura - enzymology
Brachyura - immunology
Brachyura - microbiology
Cell Adhesion - drug effects
Cell Extracts
Cell walls
Cloning
Crabs
Crustaceans
Decapoda
Drosophila
E coli
Earth science
Electrophoresis, Polyacrylamide Gel
Environmental science
Escherichia coli
Fungi - drug effects
Fungi - metabolism
Glucan
Hemocytes
Hemocytes - cytology
Hemocytes - drug effects
Hemocytes - enzymology
Homology
Immune response
Immune system
Immunity - drug effects
Immunology
In vitro methods and tests
Insects
Laboratories
Lipopolysaccharides
Manduca sexta
Minimum inhibitory concentration
Molecular biology
Monophenol Monooxygenase - metabolism
Mud
Pacifastacus leniusculus
Pattern recognition
Peptidoglycans
Phenoloxidase
Protein Binding - drug effects
Proteinase
Proteins
Recombinant Proteins - pharmacology
Scylla
Scylla paramamosain
Sequence Homology, Amino Acid
Serine
Serine Proteases - metabolism
Serine proteinase
Signal transduction
Staphylococcus aureus
Tenebrio molitor
Veterinary Science
Vibrio
Vibrio fluvialis
Vibrio harveyi
Waterborne diseases
title Identification of a serine proteinase homolog (Sp-SPH) involved in immune defense in the mud crab Scylla paramamosain
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