Evidence of a Bactericidal Permeability Increasing Protein in an Invertebrate, the Crassostrea gigas Cg-BPI

A cDNA sequence with homologies to members of the LPS-binding protein and bactericidal/permeability-increasing protein (BPI) family was identified in the oyster Crassostrea gigas. The recombinant protein was found to bind LPS, to display bactericidal activity against Escherichia coli, and to increas...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2007-11, Vol.104 (45), p.17759-17764
Hauptverfasser: Gonzalez, Marcelo, Gueguen, Yannick, Destoumieux-Garzón, Delphine, Romestand, Bernard, Fievet, Julie, Pugnière, Martine, Roquet, Françoise, Escoubas, Jean-Michel, Vandenbulcke, Franck, Levy, Ofer, Sauné, Laure, Bulet, Philippe, Bachère, Evelyne
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container_end_page 17764
container_issue 45
container_start_page 17759
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 104
creator Gonzalez, Marcelo
Gueguen, Yannick
Destoumieux-Garzón, Delphine
Romestand, Bernard
Fievet, Julie
Pugnière, Martine
Roquet, Françoise
Escoubas, Jean-Michel
Vandenbulcke, Franck
Levy, Ofer
Sauné, Laure
Bulet, Philippe
Bachère, Evelyne
description A cDNA sequence with homologies to members of the LPS-binding protein and bactericidal/permeability-increasing protein (BPI) family was identified in the oyster Crassostrea gigas. The recombinant protein was found to bind LPS, to display bactericidal activity against Escherichia coli, and to increase the permeability of the bacterial cytoplasmic membrane. This indicated that it is a BPI rather than an LPS-binding protein. By in situ hybridization, the expression of the C. gigas BPI (Cg-bpi) was found to be induced in hemocytes after oyster bacterial challenge and to be constitutive in various epithelia of unchallenged oysters. Thus, Cg-bpi transcripts were detected in the epithelial cells of tissues/organs in contact with the external environment (mantle, gills, digestive tract, digestive gland diverticula, and gonad follicles). Therefore, Cg-BPI, whose expression profile and biological properties are reminiscent of mammalian BPIs, may provide a first line of defense against potential bacterial invasion. To our knowledge, this is the first characterization of a BPI in an invertebrate.
doi_str_mv 10.1073/pnas.0702281104
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source Jstor Complete Legacy; MEDLINE; PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry
subjects Amino Acid Sequence
Animals
Antibacterials
Antimicrobial Cationic Peptides
Antimicrobial Cationic Peptides - chemistry
Antimicrobial Cationic Peptides - genetics
Antimicrobial Cationic Peptides - metabolism
Antimicrobials
Bacterial proteins
Binding sites
Biological Sciences
Blood Proteins
Blood Proteins - chemistry
Blood Proteins - genetics
Blood Proteins - metabolism
Cell Membrane Permeability
Cellular Biology
Complementary DNA
Crassostrea
Crassostrea - microbiology
Crassostrea - physiology
Crassostrea gigas
Deoxyribonucleic acid
DNA
DNA, Complementary
DNA, Complementary - genetics
E coli
Escherichia coli
Escherichia coli - physiology
Expressed Sequence Tags
Genes
Hemocytes
Invertebrata
Invertebrates
Invertebrates - microbiology
Invertebrates - physiology
Life Sciences
Lipids
Marine
Membrane Proteins
Membrane Proteins - chemistry
Membrane Proteins - genetics
Membrane Proteins - metabolism
Molecular Sequence Data
Ostreidae
Ostreidae - genetics
Ostreidae - microbiology
Ostreidae - physiology
Oysters
Permeability
Proteins
Recombinant proteins
Sequence Alignment
Sequence Homology, Amino Acid
title Evidence of a Bactericidal Permeability Increasing Protein in an Invertebrate, the Crassostrea gigas Cg-BPI
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