Functional Characterization of the ELR Motif in Piscine ELR⁺CXC-Like Chemokine

To elucidate the functional role of piscine incomplete ELR motif, the recombinant CXC and its mutants (mELR and mLoop) were produced in Escherichia coli M15 based on the predicted mature peptide coding sequence of the black sea bream CXC (BS CXC) chemokine. Assays showed that the BS rCXC proteins di...

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Veröffentlicht in:Marine biotechnology (New York, N.Y.) N.Y.), 2009-07, Vol.11 (4), p.505-512
Hauptverfasser: Cai, Zhonghua, Gao, Chunping, Zhang, Yong, Xing, Kezhi
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Gao, Chunping
Zhang, Yong
Xing, Kezhi
description To elucidate the functional role of piscine incomplete ELR motif, the recombinant CXC and its mutants (mELR and mLoop) were produced in Escherichia coli M15 based on the predicted mature peptide coding sequence of the black sea bream CXC (BS CXC) chemokine. Assays showed that the BS rCXC proteins displayed strong ability to induce fish blood neutrophils and head kidney (HK) macrophage migration in a dose-independent manner (10 to 200 ng), both in black sea bream and common carp. Although the ELR motif and the N-terminal loop of ELR⁺CXC chemokines are essential for chemotactic activity and receptor binding in mammals, the mELR and mLoop mutants showed no significant difference in their induction of chemotaxis of fish blood neutrophils compared with the full-length rCXC at the same dose. Human recombinant IL-8 (hrIL-8) can clearly induce piscine blood neutrophil migration and has no effect on macrophages, whereas the BS rCXC cannot induce chemotaxis in higher vertebrates, such as rat blood neutrophils or macrophages, even if the incomplete ELR motif in rCXC was mutated to ELR. The BS CXC and its mutants can promote the phagocytosis ability of piscine blood neutrophils and HK macrophages both in black sea bream and common carp, but have no effect on rat neutrophils or macrophages. Results showed that the piscine ELR⁺CXC-like chemokine represents an ancient version of a CXC chemokine; the ELR motif still does not show the higher specific polarization of function as found in mammalian.
doi_str_mv 10.1007/s10126-008-9165-y
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Assays showed that the BS rCXC proteins displayed strong ability to induce fish blood neutrophils and head kidney (HK) macrophage migration in a dose-independent manner (10 to 200 ng), both in black sea bream and common carp. Although the ELR motif and the N-terminal loop of ELR⁺CXC chemokines are essential for chemotactic activity and receptor binding in mammals, the mELR and mLoop mutants showed no significant difference in their induction of chemotaxis of fish blood neutrophils compared with the full-length rCXC at the same dose. Human recombinant IL-8 (hrIL-8) can clearly induce piscine blood neutrophil migration and has no effect on macrophages, whereas the BS rCXC cannot induce chemotaxis in higher vertebrates, such as rat blood neutrophils or macrophages, even if the incomplete ELR motif in rCXC was mutated to ELR. The BS CXC and its mutants can promote the phagocytosis ability of piscine blood neutrophils and HK macrophages both in black sea bream and common carp, but have no effect on rat neutrophils or macrophages. Results showed that the piscine ELR⁺CXC-like chemokine represents an ancient version of a CXC chemokine; the ELR motif still does not show the higher specific polarization of function as found in mammalian.</abstract><cop>New York</cop><pub>New York : Springer-Verlag</pub><pmid>19048342</pmid><doi>10.1007/s10126-008-9165-y</doi><tpages>8</tpages></addata></record>
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subjects Amino Acid Motifs - physiology
Amino Acid Sequence
Animals
Biomedical and Life Sciences
Blood
Carp
Chemokines
Chemokines, CXC - chemistry
Chemokines, CXC - genetics
Chemokines, CXC - metabolism
chemotaxis
Chemotaxis - drug effects
Cloning
E coli
ELR motif
ELR⁺CXC-like chemokine
Engineering
Escherichia coli - genetics
Fish Proteins - chemistry
Fish Proteins - genetics
Fish Proteins - metabolism
Freshwater & Marine Ecology
Life Sciences
Macrophages - drug effects
Macrophages - metabolism
Mammals
Marine biology
Microbiology
Molecular Sequence Data
mutants
Mutation
Neutrophils
Original Article
Peptides
Peptides - metabolism
Perciformes - genetics
Perciformes - metabolism
Plasmids
Proteins
Recombinant
Recombinant Proteins - metabolism
Recombinant Proteins - pharmacology
Studies
Zoology
title Functional Characterization of the ELR Motif in Piscine ELR⁺CXC-Like Chemokine
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