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Gene Cloning, Expression and Immunogenicity of the Protective Antigen Subolesin in Dermacentor silvarum

Yonghong Hu1,†, Hua Zeng1,†, Jincheng Zhang2, Duo Wang1, Dongming Li1, Tiantian Zhang1, Shujie Yang1, Jingze Liu1
The Korean Journal of Parasitology 2014;52(1):93-97.
Published online: February 19, 2014

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Corresponding author (jzliu21@heinfo.net)

†Yonghong Hu and Hua Zeng contributed equally to this work.

• Received: July 3, 2013   • Revised: August 24, 2013   • Accepted: August 27, 2013

© 2014, Korean Society for Parasitology and Tropical Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Subolesin (4D8), the ortholog of insect akirins, is a highly conserved protective antigen and thus has the potential for development of a broad-spectrum vaccine against ticks and mosquitoes. To date, no protective antigens have been characterized nor tested as candidate vaccines against Dermacentor silvarum bites and transmission of associated pathogens. In this study, we cloned the open reading frame (ORF) of D. silvarum 4D8 cDNA (Ds4D8), which consisted of 498 bp encoding 165 amino acid residues. The results of sequence alignments and phylogenetic analysis demonstrated that D. silvarum 4D8 (Ds4D8) is highly conserved showing more than 81% identity of amino acid sequences with those of other hard ticks. Additionally, Ds4D8 containing restriction sites was ligated into the pET-32(a+) expression vector and the recombinant plasmid was transformed into Escherichia coli rosetta. The recombinant Ds4D8 (rDs4D8) was induced by isopropyl β-D-thiogalactopyranoside (IPTG) and purified using Ni affinity chromatography. The SDS-PAGE results showed that the molecular weight of rDs4D8 was 40 kDa, which was consistent with the expected molecular mass considering 22 kDa histidine-tagged thioredoxin (TRX) protein from the expression vector. Western blot results showed that rabbit anti-D. silvarum serum recognized the expressed rDs4D8, suggesting an immune response against rDs4D8. These results provided the basis for developing a candidate vaccine against D. silvarum ticks and transmission of associated pathogens.
  • Key words: Dermacentor silvarum, protective antigen, subolesin, 4D8, rDs4D8, vaccine
The hard tick Dermacentor silvarum Olenev, one of the principal vectors of Russian spring-summer encephalitis virus, Babesia equi, Babesia caballi, Rickettsia slovaca, and Rickettsia raoultii, is widely distributed in northern China, Russia, and Mongolia, and has an impact on human health as well as economic losses [1,2]. Previous studies on D. silvarum mainly focused on its life cycle and biological characteristics [3], and no candidate vaccines against biting D. silvarum have been reported. Thus, searching for a protective antigen as an effective vaccine against D. silvarum infection is necessary.
Tick subolesin (4D8) is the ortholog of insect akirins, which are evolutionarily conserved proteins that affect the innate immune response, reproduction, and development of ticks [4-6]. Vaccination trials with the recombinant 4D8/akirins antigens reduced fertility and survival, not only in ticks, but also in mosquitoes and sand flies [7]. Here, the D. silvarum 4D8 (Ds4D8) gene was cloned, and immunogenicity of the recombinant Ds4D8 (rDs4D8) was analyzed by western blot.
Adult D. silvarum were collected from infested sheep at the Xiaowutai National Natural Conservation Area, Hebei province, China and reared as described previously [3]. To clone the Ds4D8 gene, 2 µg of total RNA was extracted from adult females using RNA purification kit (Axygen, Union City, California, USA) and reverse-transcribed to synthesize cDNA templates using a cDNA synthesis kit (ThermoScript RT-PCR system, Invitrogen, Carlsbad, California, USA). The forward primer FP-RA4D85 and reverse primer RP-RA4D83 (Table 1) were used to clone the open reading frame (ORF) of Ds4D8 cDNA (Ds4D8). PCR samples were amplified at 94℃ for 2 min, followed by 30 cycles of 94℃ for 30 sec, 59℃ for 30 sec, 68℃ for 1 min, and a final extension at 72℃ for 10 min. Subsequently, Ds4D8 protein sequences were aligned using ClustalX, and the output of a graphic file was used with DNAMAN software. Phylogenetic analysis was constructed using MEGA version 3.1. A bootstrap resampling analysis with 1,000 replicates was performed to evaluate the inferred tree topology.
The gene-specific primers with EcoRI/XhoI restriction enzyme sites, the forward primer FP-EcoRI-RA4D85 and reverse primer RP-XhoI-RA4D83 (Table 1), were designed to clone the Ds4D8. PCR amplification was performed at 94℃ for 2 min, followed by 35 cycles of 94℃ for 30 sec, 59℃ for 30 sec, 72℃ for 50 sec, and a final extension for 10 min at 72℃. The PCR products were ligated into the pMD19-T cloning vector (Takara, Ohtsu, Japan), digested with restriction enzymes, and ligated into the pET-32 (a+) expression vector (Takara) to form the recombinant plasmid pET-32(a+)-4D8 which was transformed into Escherichia coli rosetta. The recombinant protein rDs4D8 was fused with 22 kDa histidine-tagged thioredoxin protein (TRX), following the induction by 1 mM isopropyl β-D-thiogalactopyranoside (IPTG) for 5 hr at 37℃. E. coli liquids of different treatment were centrifugated by 10,000 rpm for 10 min at 4℃ and the precipitate was broken up by ultrasonic disruption (power, 400 W), and 20 µg protein samples per lane were separated by 10% SDS-PAGE.
The immunogenicity analysis of rDs4D8 was performed by western blot. A total of 20 µg protein sample per lane, including prestained protein marker (Fermentas, Ontario, Canada), purified rDs4D8, and IPTG-induced E. coli containing pET-32(a+)-4D8, were separated by 10% SDS-PAGE and transferred to polyvinylidene difluoride (PVDF) membrane. The membrane was cut into 2 strips and blocked for 2 hr in PBS-Tween-20 (PBST) containing 5% fat-free milk, and then incubated with rabbit anti-D. silvarum serum (1:2,000) and rabbit negative serum overnight at room temperature, respectively. Following overnight incubation, they were washed with PBST and incubated with diluted peroxidase-conjugated affinipure goat anti-rabbit IgG (1:2,000) for 1.5 hr (Proteintech, Chicago, Illinois, USA). Positive signals were detected using supersignal® west dura extended duration substrate (Thermo Scientific, Rockford, Illinois, USA).
The Ds4D8 sequence, consisted of 498 bp and encoding 165 amino acid residues, was submitted to GenBank (no. JX856138) (Fig. 1). The predicted amino acid sequence was compared with ORF from 12 tick species belonging to 6 different genera (Fig. 2). The results showed that Ds4D8 shared 100% identity with Dermacentor marginatus, 98.2% identity with Dermacentor variabilis, 95.4% identity with Hyalomma marginatum, 93.9% identity with Rhipicephalus sanguineus, 93.0% identity with Rhipicephalus appendiculatus and Rhipicephalus microplus, and 81.0-90.2% identity for ticks in the other 3 genera. In addition, the phylogenetic tree showed 2 major monophyletic clades (excluding outgroup sequences) and sequences clustered in each clade were classified as a subfamily (Fig. 3). One monophyletic clade for 4D8 included Ixodes ricinus and Ixodes scapularis as a subfamily with bootstrap scores 100. The other monophyletic clade included Rhipicephalus, Dermacentor, Hyalomma, Haemaphysalis, and Amblyomma spp.
As shown in 10% SDS-PAGE gel (Fig. 4), the rDs4D8 expression was induced by IPTG and its molecular weight was about 40 kDa, which was consistent with the expected molecular mass considering that the expression vector produced a recombinant protein fused with a 22 kDa TRX protein (Fig. 4). The reactivities of the purified rDs4D8 and IPTG-induced E. coli containing pET-32(a+)-4D8 with rabbit anti-D. silvarum serum were tested by western blot. The results showed that the rDs4D8 (40 kDa) in lane 1 and lane 2 could be recognized by rabbit anti-D. silvarum serum, while rabbit negative serum did not react with the rDs4D8 expressed in E. coli of lane 3 (Fig. 5).
The 4D8 plays a potential role in tick control. For example, de la Fuente et al. [4] verified that the silencing of 4D8 expression after RNAi resulted in the reduction of tick weight, oviposition, and survival. Oviposition was reduced in over 90% of all tick species evaluated. Vaccination with recombinant tick 4D8 may control R. microplus tick infestations in white-tailed deer to reduce tick populations, where the overall vaccine efficacy was 83% [8]. In addition, Merino et al. [9] confirmed that 4D8 vaccines also reduced the infection levels by 2 of the most important pathogens transmitted by cattle ticks, Anaplasma marginale and Babesia bigemina. To date, no 4D8 orthologs have been fully characterized nor tested as recombinant antigens in D. silvarum.
In this study, we cloned Ds4D8 containing 498 bp coding for 165 amino acids with a predicted molecular weight of 18 kDa, which was similar to the values observed for most 4D8 proteins [4]. The results of multiple alignment and phylogenetic relationship demonstrated that 4D8 protein sequences are highly conserved among Dermacentor, Rhipicephalus, and Hyalomma.
The 4D8 cDNA from Ornithodoros erraticus was subcloned into the expression vector pQE-30 and expressed in E. coli M15 cells [10]. The western blot results showed that the molecular weight of O. erraticus recombinant 4D8 was about 23 kDa containing 6×His-tagged recombinant polypeptides, while rDs4D8 had a larger molecular weight of 40 kDa when fused with pET-32(a+) tag protein. This may be due to the difference of expression vectors. In addition, Bensaci et al. [11] cloned I. scapularis 4D8 into vaccinia virus vector, and it was expressed from mammalian cells infected with the recombinant virus. The results suggested that immunized mice with I. scapularis 4D8 by oral gavage inhibited tick feeding and transmission of Borrelia burgdorferi. This provided a new way to analyze the function of rDs4D8 in D. silvarum.
By combining the results of peptide and phage-display libraries scan analysis, tick 4D8 linear B-cell epitopes (T1, T2, and T3) were identified [12]. Subsequently, the Q38 and Q41 chimeras were designed by combining 4D8 and akirin protective epitopes [12]. Studies of immunized mice showed that tick molting from larvae to nymphs was significantly reduced by 14-48% when compared to controls [13]. Our results of western blot showed that rDs4D8 demonstrated immunities against rabbit anti-D. silvarum serum. These data provided a basis for future studies on immunization with rDs4D8 or 4D8 epitopes to prevent attachment of D. silvarum ticks on target vertebrate hosts.
A Project of Education Department of Hebei Province2011160Natural Science Foundation of Hebei ProvinceC2011205104The Foundation of Hebei Normal University, ChinaL2012Z06L2008B10

We declare that we have no conflict of interest related with this work.

This work was supported by a Project of Education Department of Hebei Province (grant no. 2011160), Natural Science Foundation of Hebei Province (grant no. C2011205104) and the Foundation of Hebei Normal University, China (no. L2012Z06 and no. L2008B10).
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Fig. 1
Nucleic acid and deduced amino acid sequence of Ds4D8. The start codon is underlined and the stop codon is marked with an asterisk.
kjp-52-93-g001.jpg
Fig. 2
Multiple alignment of 4D8 protein sequences for various tick species. Alignments were accomplished with Clustal X software. The graphic file was constructed by DNAMAN software program. GenBank accession numbers were Rhipicephalus appendiculatus, ABA62331; Rhipicephalus microplus, ABZ89745; Rhipicephalus sanguineus, ABA62332; Ixodes ricinus, ABA62325; Ixodes scapularis, AAV67031; Dermacentor silvarum, AFY52599; Dermacentor marginatus, ABA62333; Dermacentor variabilis, AAV67034; Hyalomma marginatum, ABA62335; Haemaphysalis punctata, ABA62336; Haemaphysalis qinghaiensis, ACA09713; Amblyomma americanum, ABA62326; Amblyomma hebraeum, ABY84524. The dark black shade shows identity.
kjp-52-93-g002.jpg
Fig. 3
Phylogenetic relationship of 4D8 sequences for various tick species. The outgroup sequence is 4D8 sequences of Apis mellifera (XP_395252) and Drosophila melanogaster (AAF50569). Numbers at the nodes represent bootstrap values on 1,000 replicates. The accession numbers of the other 4D8 sequences from ticks are shown in parentheses.
kjp-52-93-g003.jpg
Fig. 4
SDS-PAGE analysis of rDs4D8 expressed in E. coli. The E. coli lysates were electrophoresed on 10% SDS-PAGE and stained with Coomassie brilliant blue R-250. M, molecular weight marker; lane 1, IPTG-induced E. coli with pET-32 (a+); lane 2, uninduced E. coli with pET-32(a+)-4D8; Lane 3, IPTG-induced E. coli with pET-32(a+)-4D8; Lane 4, purified rDs4D8. TRX protein (22 kDa) and rDs4D8 (40 kDa) are shown by arrow.
kjp-52-93-g004.jpg
Fig. 5
Immunogenicity analysis of the expressed rDs4D8. M, molecular weight marker; Lane 1, purified rDs4D8 incubated by rabbit anti-D. silvarum serum; Lane 2, IPTG-induced E. coli with pET-32(a+)-4D8 incubated by rabbit anti-D. silvarum serum; Lane 3, IPTG-induced E. coli with pET-32(a+)-4D8 incubated by rabbit negative serum.
kjp-52-93-g005.jpg
Table 1.
Primer pairs used for Ds4D8 amplification by PCR
Table 1.
Primer name Sequence
FP-RA4D85 ATGGCTTGTGCGACATTAAAGC
RP-RA4D83 TTACGACAAATAGCTGGGCGTAGC
FP-EcoRI-RA4D85 GAATTCATGGCTTGTGCGACATTAAAGC
RP-XhoI-RA4D83 CTCGAGTTACGACAAATAGCTGGGCGTAGC

The orientation of the primer is from 5´ end to 3´ end.

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Gene Cloning, Expression and Immunogenicity of the Protective Antigen Subolesin in Dermacentor silvarum
Korean J Parasitol. 2014;52(1):93-97.   Published online February 19, 2014
DOI: https://doi.org/10.3347/kjp.2014.52.1.93
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Gene Cloning, Expression and Immunogenicity of the Protective Antigen Subolesin in Dermacentor silvarum
Korean J Parasitol. 2014;52(1):93-97.   Published online February 19, 2014
DOI: https://doi.org/10.3347/kjp.2014.52.1.93
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Gene Cloning, Expression and Immunogenicity of the Protective Antigen Subolesin in Dermacentor silvarum
Image Image Image Image Image
Fig. 1 Nucleic acid and deduced amino acid sequence of Ds4D8. The start codon is underlined and the stop codon is marked with an asterisk.
Fig. 2 Multiple alignment of 4D8 protein sequences for various tick species. Alignments were accomplished with Clustal X software. The graphic file was constructed by DNAMAN software program. GenBank accession numbers were Rhipicephalus appendiculatus, ABA62331; Rhipicephalus microplus, ABZ89745; Rhipicephalus sanguineus, ABA62332; Ixodes ricinus, ABA62325; Ixodes scapularis, AAV67031; Dermacentor silvarum, AFY52599; Dermacentor marginatus, ABA62333; Dermacentor variabilis, AAV67034; Hyalomma marginatum, ABA62335; Haemaphysalis punctata, ABA62336; Haemaphysalis qinghaiensis, ACA09713; Amblyomma americanum, ABA62326; Amblyomma hebraeum, ABY84524. The dark black shade shows identity.
Fig. 3 Phylogenetic relationship of 4D8 sequences for various tick species. The outgroup sequence is 4D8 sequences of Apis mellifera (XP_395252) and Drosophila melanogaster (AAF50569). Numbers at the nodes represent bootstrap values on 1,000 replicates. The accession numbers of the other 4D8 sequences from ticks are shown in parentheses.
Fig. 4 SDS-PAGE analysis of rDs4D8 expressed in E. coli. The E. coli lysates were electrophoresed on 10% SDS-PAGE and stained with Coomassie brilliant blue R-250. M, molecular weight marker; lane 1, IPTG-induced E. coli with pET-32 (a+); lane 2, uninduced E. coli with pET-32(a+)-4D8; Lane 3, IPTG-induced E. coli with pET-32(a+)-4D8; Lane 4, purified rDs4D8. TRX protein (22 kDa) and rDs4D8 (40 kDa) are shown by arrow.
Fig. 5 Immunogenicity analysis of the expressed rDs4D8. M, molecular weight marker; Lane 1, purified rDs4D8 incubated by rabbit anti-D. silvarum serum; Lane 2, IPTG-induced E. coli with pET-32(a+)-4D8 incubated by rabbit anti-D. silvarum serum; Lane 3, IPTG-induced E. coli with pET-32(a+)-4D8 incubated by rabbit negative serum.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Gene Cloning, Expression and Immunogenicity of the Protective Antigen Subolesin in Dermacentor silvarum
Primer name Sequence FP-RA4D85 ATGGCTTGTGCGACATTAAAGC RP-RA4D83 TTACGACAAATAGCTGGGCGTAGC FP-EcoRI-RA4D85 GAATTCATGGCTTGTGCGACATTAAAGC RP-XhoI-RA4D83 CTCGAGTTACGACAAATAGCTGGGCGTAGC
Table 1. Primer pairs used for Ds4D8 amplification by PCR

The orientation of the primer is from 5´ end to 3´ end.

Table 1.

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