The molecular and structural characterization of two vitellogenins from the free-living nematode Oscheius tipulae

This paper describes the purification of yolk proteins, which are important for the reproduction of egg-laying animals, and the structural characterization of two vitellogenins, VT1 and OTI-VIT-6, of the nematode Oscheius tipulae. O. tipulae is an alternative model organism to its relative, the wide...

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Veröffentlicht in:PloS one 2013-01, Vol.8 (1), p.e53460-e53460
Hauptverfasser: Almenara, Daniela P, de Moura, Joselene P, Scarabotto, Cristiane P, Zingali, Russolina B, Winter, Carlos E
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Winter, Carlos E
description This paper describes the purification of yolk proteins, which are important for the reproduction of egg-laying animals, and the structural characterization of two vitellogenins, VT1 and OTI-VIT-6, of the nematode Oscheius tipulae. O. tipulae is an alternative model organism to its relative, the widely used Caenorhabditis elegans, and is a good model to understand reproduction in insect parasitic nematodes of the genus Heterorhabditis. The native purified O. tipulae vitellogenin is composed of three polypeptides (VT1, VT2 and VT3), whereas in C. elegans, vitellogenin is composed of four polypeptides. The gene (Oti-vit-1) encoding yolk polypeptide VT1 has been recently identified in the genome of O. tipulae. Immunoblotting and N-terminal sequencing confirmed that VT1 is indeed coded by Oti-vit-1. Utilizing the same experimental approaches, we showed that the polypeptides VT2 and VT3 are derived from the proteolytic processing of the C- and N-terminal portions of the precursor OTI-VIT-6, respectively. We also showed that the recombinant polypeptide (P40), corresponding to the N-terminal sequence of OTI-VIT-6, preferentially interacts with a 100-kDa polypeptide found in adult worm extracts, as we have previously shown for the native vitellins of O. tipulae. Using the putative nematode vitellogenin amino acid sequences available in the UniProtKB database, we constructed a phylogenetic tree and showed that the O. tipulae vitellogenins characterized in this study are orthologous to those of the Caenorhabditis spp. Together, these results represent the first structural and functional comparative study of nematode yolk proteins outside the Caenorhabditis genus and provide insight into the evolution of these lipoproteins within the Nematode Phylum.
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O. tipulae is an alternative model organism to its relative, the widely used Caenorhabditis elegans, and is a good model to understand reproduction in insect parasitic nematodes of the genus Heterorhabditis. The native purified O. tipulae vitellogenin is composed of three polypeptides (VT1, VT2 and VT3), whereas in C. elegans, vitellogenin is composed of four polypeptides. The gene (Oti-vit-1) encoding yolk polypeptide VT1 has been recently identified in the genome of O. tipulae. Immunoblotting and N-terminal sequencing confirmed that VT1 is indeed coded by Oti-vit-1. Utilizing the same experimental approaches, we showed that the polypeptides VT2 and VT3 are derived from the proteolytic processing of the C- and N-terminal portions of the precursor OTI-VIT-6, respectively. We also showed that the recombinant polypeptide (P40), corresponding to the N-terminal sequence of OTI-VIT-6, preferentially interacts with a 100-kDa polypeptide found in adult worm extracts, as we have previously shown for the native vitellins of O. tipulae. Using the putative nematode vitellogenin amino acid sequences available in the UniProtKB database, we constructed a phylogenetic tree and showed that the O. tipulae vitellogenins characterized in this study are orthologous to those of the Caenorhabditis spp. Together, these results represent the first structural and functional comparative study of nematode yolk proteins outside the Caenorhabditis genus and provide insight into the evolution of these lipoproteins within the Nematode Phylum.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0053460</identifier><identifier>PMID: 23308227</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Amino Acid Sequence ; Amino acids ; Animals ; Apolipoproteins ; Biochemistry ; Biology ; Caenorhabditis - genetics ; Caenorhabditis elegans ; Comparative studies ; Egg laying ; Eggs ; Embryos ; Escherichia coli - genetics ; Female ; Gene Expression ; Gene sequencing ; Genes ; Genomes ; Genomics ; Immunoblotting ; Insects ; Laboratories ; Ligands ; Lipids ; Lipoproteins ; Molecular Sequence Data ; Nematodes ; Ovum - chemistry ; Parasitology ; Peptides - chemistry ; Peptides - genetics ; Phylogeny ; Polypeptides ; Protein purification ; Protein Structure, Tertiary ; Proteins ; Proteolysis ; Recombinant Proteins - chemistry ; Recombinant Proteins - genetics ; Reproduction ; Rhabditoidea - genetics ; Roundworms ; Sequence Homology, Amino Acid ; Structural analysis ; Structure-function relationships ; Vitellogenin ; Vitellogenins - chemistry ; Vitellogenins - classification ; Vitellogenins - genetics ; Worms ; Yolk</subject><ispartof>PloS one, 2013-01, Vol.8 (1), p.e53460-e53460</ispartof><rights>COPYRIGHT 2013 Public Library of Science</rights><rights>2013 Almenara et al. 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We also showed that the recombinant polypeptide (P40), corresponding to the N-terminal sequence of OTI-VIT-6, preferentially interacts with a 100-kDa polypeptide found in adult worm extracts, as we have previously shown for the native vitellins of O. tipulae. Using the putative nematode vitellogenin amino acid sequences available in the UniProtKB database, we constructed a phylogenetic tree and showed that the O. tipulae vitellogenins characterized in this study are orthologous to those of the Caenorhabditis spp. Together, these results represent the first structural and functional comparative study of nematode yolk proteins outside the Caenorhabditis genus and provide insight into the evolution of these lipoproteins within the Nematode Phylum.</description><subject>Amino Acid Sequence</subject><subject>Amino acids</subject><subject>Animals</subject><subject>Apolipoproteins</subject><subject>Biochemistry</subject><subject>Biology</subject><subject>Caenorhabditis - genetics</subject><subject>Caenorhabditis elegans</subject><subject>Comparative studies</subject><subject>Egg laying</subject><subject>Eggs</subject><subject>Embryos</subject><subject>Escherichia coli - genetics</subject><subject>Female</subject><subject>Gene Expression</subject><subject>Gene sequencing</subject><subject>Genes</subject><subject>Genomes</subject><subject>Genomics</subject><subject>Immunoblotting</subject><subject>Insects</subject><subject>Laboratories</subject><subject>Ligands</subject><subject>Lipids</subject><subject>Lipoproteins</subject><subject>Molecular Sequence Data</subject><subject>Nematodes</subject><subject>Ovum - 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genetics</topic><topic>Caenorhabditis elegans</topic><topic>Comparative studies</topic><topic>Egg laying</topic><topic>Eggs</topic><topic>Embryos</topic><topic>Escherichia coli - genetics</topic><topic>Female</topic><topic>Gene Expression</topic><topic>Gene sequencing</topic><topic>Genes</topic><topic>Genomes</topic><topic>Genomics</topic><topic>Immunoblotting</topic><topic>Insects</topic><topic>Laboratories</topic><topic>Ligands</topic><topic>Lipids</topic><topic>Lipoproteins</topic><topic>Molecular Sequence Data</topic><topic>Nematodes</topic><topic>Ovum - chemistry</topic><topic>Parasitology</topic><topic>Peptides - chemistry</topic><topic>Peptides - genetics</topic><topic>Phylogeny</topic><topic>Polypeptides</topic><topic>Protein purification</topic><topic>Protein Structure, Tertiary</topic><topic>Proteins</topic><topic>Proteolysis</topic><topic>Recombinant Proteins - chemistry</topic><topic>Recombinant Proteins - genetics</topic><topic>Reproduction</topic><topic>Rhabditoidea - genetics</topic><topic>Roundworms</topic><topic>Sequence Homology, Amino Acid</topic><topic>Structural analysis</topic><topic>Structure-function relationships</topic><topic>Vitellogenin</topic><topic>Vitellogenins - 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O. tipulae is an alternative model organism to its relative, the widely used Caenorhabditis elegans, and is a good model to understand reproduction in insect parasitic nematodes of the genus Heterorhabditis. The native purified O. tipulae vitellogenin is composed of three polypeptides (VT1, VT2 and VT3), whereas in C. elegans, vitellogenin is composed of four polypeptides. The gene (Oti-vit-1) encoding yolk polypeptide VT1 has been recently identified in the genome of O. tipulae. Immunoblotting and N-terminal sequencing confirmed that VT1 is indeed coded by Oti-vit-1. Utilizing the same experimental approaches, we showed that the polypeptides VT2 and VT3 are derived from the proteolytic processing of the C- and N-terminal portions of the precursor OTI-VIT-6, respectively. We also showed that the recombinant polypeptide (P40), corresponding to the N-terminal sequence of OTI-VIT-6, preferentially interacts with a 100-kDa polypeptide found in adult worm extracts, as we have previously shown for the native vitellins of O. tipulae. Using the putative nematode vitellogenin amino acid sequences available in the UniProtKB database, we constructed a phylogenetic tree and showed that the O. tipulae vitellogenins characterized in this study are orthologous to those of the Caenorhabditis spp. Together, these results represent the first structural and functional comparative study of nematode yolk proteins outside the Caenorhabditis genus and provide insight into the evolution of these lipoproteins within the Nematode Phylum.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23308227</pmid><doi>10.1371/journal.pone.0053460</doi><tpages>e53460</tpages><oa>free_for_read</oa></addata></record>
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subjects Amino Acid Sequence
Amino acids
Animals
Apolipoproteins
Biochemistry
Biology
Caenorhabditis - genetics
Caenorhabditis elegans
Comparative studies
Egg laying
Eggs
Embryos
Escherichia coli - genetics
Female
Gene Expression
Gene sequencing
Genes
Genomes
Genomics
Immunoblotting
Insects
Laboratories
Ligands
Lipids
Lipoproteins
Molecular Sequence Data
Nematodes
Ovum - chemistry
Parasitology
Peptides - chemistry
Peptides - genetics
Phylogeny
Polypeptides
Protein purification
Protein Structure, Tertiary
Proteins
Proteolysis
Recombinant Proteins - chemistry
Recombinant Proteins - genetics
Reproduction
Rhabditoidea - genetics
Roundworms
Sequence Homology, Amino Acid
Structural analysis
Structure-function relationships
Vitellogenin
Vitellogenins - chemistry
Vitellogenins - classification
Vitellogenins - genetics
Worms
Yolk
title The molecular and structural characterization of two vitellogenins from the free-living nematode Oscheius tipulae
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