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Antigen epitopes are the basic functional units of antigen.B-cell antigen epitope prediction is important for vaccine design, development of diagnostic reagents and preparation of high-throughput antibody.This paper summarized the recent advances on prediction methods of B-cell linear epitopes and B-cell conformational epitopes, and compared these prediction methods in order to provide theoretical references for the researches of antigen epitopes. 相似文献
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Goose parvovirus (GPV), a small non-enveloped ssDNA virus, can cause Derzsy's disease, a highly contagious and lethal disease in goslings and muscovy ducklings, leading to a huge economic loss. However, little is known about the localization of B-cell epitopes on GPV structural protein. To address the issue, the structural protein of GPV was dissected into sets of partially overlapping fragments and expressed in Escherichia coli. Then Western blot reactivity of these glutathione S-transferase (GST) fusion short peptides to viral infected sera was surveyed. The results showed linear immunodominant epitopes, which were found in seven fragments covering amino acid residues 35-71, 123-198, 423-444, 474-491, 531-566, 616-669, 678-732. Our findings may provide the basis for the development of immunity-based prophylactic, therapeutic, and diagnostic clinical techniques for Derzsy's disease. 相似文献
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A comparison of diagnostic methods for the detection of bovine respiratory syncytial virus in experimental clinical specimens. 总被引：1，自引：0，他引：1 
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下载免费PDF全文 K West J Bogdan A Hamel G Nayar P S Morley D M Haines J A Ellis 《Canadian journal of veterinary research》1998,62(4):245-250
Virus shedding was monitored in nasal secretions of 12 calves experimentally infected with bovine respiratory syncytial virus (BRSV) using an antigen capture enzyme-linked immunosorbent assay (ELISA) detecting the nucleoprotein (NP) antigen of BRSV, by a polymerase chain reaction (PCR) amplifying the fusion protein of BRSV, and by a microisolation assay combined with immunoperoxidase staining for the F protein of BRSV. Under the conditions of this study, similar limits of detection and quantitative results were obtained from all three assays. BRSV was detected in nasal secretions of all calves for a minimum of 4 d. Virus shedding began on Day 2 after infection, peaked on Days 3-5, and was cleared in most calves by Day 8. The PCR, and to a lesser extent the ELISA, may detect virus shedding for a longer period after infection than virus isolation, possibly due to neutralization of the virus by rising mucosal antibody. Simulated environmental conditions likely to be experienced during transport of clinical field specimens markedly reduced the sensitivity of virus isolation but had a minimal effect on the results of the NP ELISA. Actual field transport conditions (overnight on ice) had minimal apparent effect on the results of the PCR assay. The less stringent specimen handling requirements, combined with low limits of detection, of both the nucleoprotein ELISA and PCR, indicate either of these assays are more suitable for diagnostic applications than virus isolation. 相似文献
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Ahmad-Raus R Ali AM Tan WS Salleh HM Eshaghi M Yusoff K 《Research in veterinary science》2009,86(1):174-18891
A panel of six monoclonal antibodies (mAbs) against the nucleocapsid (NP) protein of Newcastle disease virus (NDV) was produced by immunization of Balb/c mice with purified recombinant NP protein. Western Blot analysis showed that all the mAbs recognized linearized NP epitopes. Three different NP antigenic sites were identified using deleted truncated NP mutants purified from Escherichia coli. One of the antigenic sites was located at the C-terminal end (residues 441 to 489) of the NP protein. Two other antigenic sites were located within the N-terminal end (residues 26-121 and 122-375). This study demonstrates that the N- and C-terminal ends of the NP proteins are responsible in eliciting immune response, thus it is most likely that these ends are exposed on the NP. 相似文献
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The influenza A nucleoprotein (NP) is an attractive target for avian flu vaccine development because of its high conversancy in the evolutionary chain of the virus. Here we identified two novel HLA-A*0201 restricted NP epitopes, named H5N1 NP373-381 AMDSNTLEL (NP373) and NP458-466 FQGRGVFEL (NP458), using computational bioinformatic analysis. The NP peptides showed a high binding affinity to HLA-A*0201 on T2 cells, and were able to induce the activation of the cytotoxic T cells in the human peripheral blood mononuclear cells. We examined the potential of using NP373 and NP458 peptide sequences supplemented with a single-chain trimer as potential DNA vaccine candidates in an HHD transgenic mouse model. A gene gun delivery system was used for administrating the vaccine candidates into the animals. The results from cytotoxicity and ELISPOT assays indicated that a significant amount of IFN-γ was secreted by the T cells of the vaccinated mice, and the T cells were able to eliminate the corresponding peptide-loaded T2 cells. The discovery of these novel immunogenic NP peptides provides valuable information for avian flu vaccine design and construction. 相似文献
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Serological assays may have merit in identifying animals in advanced stages of bovine tuberculosis, but most tests have had sub-optimal sensitivities and specificities. The Mycobacterium bovis protein MPB70 has been identified as a B-cell target with diagnostic potential in measurement of pre- and post-skin-test antibody responses. One observation, which has potential practical application, has been that skin testing with tuberculin boosts IgG(1) anti-MPB70 antibody responses in cattle with tuberculous lesions. However, serological cross-reactivities with bacteria, such as Nocardia asteroides, have been described for this protein. With the aim of identifying candidate reagents for improved diagnostic tests, this study investigated IgG isotype antibody responses to MPB70 at the epitope level and, because of the previous findings, focused on IgG(1) responses following skin testing. Screening of a panel of overlapping synthetic peptides using sera from cattle immunised with MPB70 and cattle infected with M. bovis showed that two regions of the protein (residues 21-70 and 101-120) contain dominant B-cell epitopes. No individual epitope appeared to be selectively recognised by one isotype of IgG antibody. Investigation of IgG(1) responses showed that recognition of the epitope within residues 51-70 was boosted strongly by tuberculin injections in skin-test positive cattle and that this memory response was generally a feature of cattle which were found to have macroscopic, tuberculous lesions. 相似文献
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针对小反刍兽疫病毒核蛋白制备特异性的单克隆抗体,并对其进行生物学特性鉴定和初步应用。以纯化的Bacmid-PPRV-N重组蛋白为抗原免疫BALB/c小鼠,取免疫小鼠的致敏脾细胞与SP2/0骨髓瘤细胞在PEG作用下融合,获得单克隆抗体,并通过染色体技术等方法研究其生物学特性,将其作为竞争单抗,Bacmid-PPRV-N重组蛋白作为检测抗原建立竞争ELISA检测方法。结果表明:经克隆和间接ELISA筛选,获得了2株能稳定分泌抗小反刍兽疫病毒N蛋白抗体的杂交瘤细胞株,分别命名为5B11和3H10-3B8。生物学特性鉴定试验表明:5B11和3H10-3B8抗体类型和亚类均为IgG2b;5B11单抗腹水的效价达1∶819 200,3H10-3B8达1∶12 800;血清学试验证明2株单抗均能与Bacmid-PPRV-N重组蛋白抗原结合,具有高度的特异性;相加ELISA试验结果显示,5B11和3H10-3B8 2株单克隆抗体分别识别N蛋白上不同的抗原位点;2株杂交瘤细胞的染色体均为99～104。应用建立的c-ELISA检测方法对222份血清样品进行PPRV抗体的检测,与参考试剂盒比较得到98.20%的符合率。本研究获得了2株能稳定分泌抗PPRV N蛋白单克隆抗体的杂交瘤细胞株,以单抗5B11作为竞争抗体建立了PPRV的c-ELISA检测方法。 相似文献
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斯氏副柔线虫GP基因的克隆、抗原表位预测及生物信息学分析 总被引：1，自引：1，他引：0
试验旨在克隆斯氏副柔线虫糖蛋白（glycoprotein，GP）抗原基因，并对其进行生物信息学分析。提取斯氏副柔线虫组织RNA，反转录合成cDNA，设计特异性引物以扩增GP基因CDS区，同时将其插入到克隆载体pMD19-T后测序，并对该基因编码蛋白的抗原表位、理化性质、信号肽、跨膜结构域等进行生物信息学预测。结果表明，GP基因开放阅读框（ORF）全长1 149 bp，编码382个氨基酸，其分子式为C1760H2878N458O590S1760，理论分子质量约为40.15 ku，等电点为4.37，无信号肽，总平均亲水性为0.032，不稳定系数为42.43，是疏水、不稳定蛋白；其磷酸化位点分布位于丝氨酸（Ser）、苏氨酸（Thr）和酪氨酸（Tyr）残基上；二级结构分析显示，斯氏副柔线虫GP蛋白以α-螺旋和无规则卷曲为主，与三级结构预测结果一致；抗原表位预测表明，GP蛋白可能有6个B细胞抗原表位和8个T细胞抗原表位，有望用作免疫诊断抗原和疫苗候选抗原。本研究成功克隆了斯氏副柔线虫GP基因，同时进行了系统的生物信息学分析和抗原表位预测，为斯氏副柔线虫病iELISA诊断方法的建立和DNA疫苗的研究提供理论依据。 相似文献
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犬瘟热病毒N蛋白的B细胞抗原表位预测 总被引：1，自引：0，他引：1
将1段犬瘟热病毒N蛋白氨基酸序列（GenBank编号为：AEV77096．1）与GenBank登录的其他氨基酸序列进行比对,分析其同源性;通过DNAStar生物信息学分析软件中的Protean模块及The PredictProteinserver在线蛋白分析工具预测犬瘟热病毒N蛋白的理化性质、二级结构、亲水性、表面可及性、柔韧性、抗原指数、跨膜螺旋、蛋白相互作用位点、蛋白功能位点等特性,并预测其B细胞优势抗原表位。结果显示,犬瘟热病毒N蛋白具有规则的二级结构、亲水性、柔韧性片段多,多处于表面可及性大,抗原指数高,蛋白质相互作用位点区域。潜在的B细胞优势抗原表位为12～18、61～66、243～246、410～415、421～429、434～447、452～456、480～487氨基酸序列。结果表明,本试验预测了犬瘟热病毒N蛋白的B细胞优势抗原表位,为进一步设计犬瘟热病毒的诊断抗原多肽、免疫用抗原多肽和研发血清学检测试剂盒奠定了理论基础。 相似文献
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A competitive ELISA (C-ELISA) using monoclonal antibodies (mAbs) which bind to the nucleo-protein (NP) of rinderpest virus (RPV) for detection of RPV antibodies in cattle and small ruminant sera is described. Unlike virus neutralisation test (VNT), this test using mAb IVB2-4, can detect specific RPV antibodies without showing a cross-reaction with antibodies to peste-des-petits ruminants-virus (PPRV); by contrast, when mAb VE4-1 is used the test detects both RPV and PPRV antibodies, including low levels of antibodies that can be found in sera containing maternal antibodies. Although antibodies to the PPRV 75-1 strain are also detected with mAb 51-5-6, the test is suitable for assessing the immune status of cattle against the Rinderpest Old Kabete (RBOK) strain. The results from a panel of sera with a known status of vaccination provide evidence for a highly significant correlation between C-ELISA and VNT. This test may be a useful tool for a standardized and accurate determination of the immunity status of both cattle and small ruminants. 相似文献
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鹅细小病毒非结构蛋白B细胞线性抗原表位的鉴定及抗原表位区分子特性分析 总被引：1，自引：0，他引：1
为进一步对鹅细小病毒(GPV)非结构(NS)蛋白B细胞线性抗原表位进行定位,本研究设计了覆盖NS1蛋白C末端453 aa～627 aa的7个长约30个氨基酸残基的重叠短肽,并进行了融合表达。蛋白质印迹分析结果表明,表达的融合蛋白NSb(485 aa～514 aa)、NSc(498 aa～532 aa)、NSd(523 aa～556 aa)、NSe(543 aa～573 aa)、NSf(564 aa～598 aa)和NSg(599 aa～627 aa)能够被GPV免疫的鹅血清识别。将抗原表位区推导氨基酸序列与GenBank中登录的12株GPV和番鸭细小病毒(MDPV)相应序列应用DNAMAN进行同源性比较,并构建了系统进化树。分析结果表明,GPV各株之间的同源性较高,但在强弱毒株和不同地区分离株中存在一定的差异。同时,GPV和MDPV的NS蛋白中可能存在共同的线性抗原表位区。 相似文献
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B. Mondal A. Sen K. Chand S. K. Biswas A. De K. K. Rajak S. Chakravarti 《Tropical animal health and production》2009,41(8):1661-1667
A mixed infection with peste des petits ruminants virus (PPRV) and bluetongue virus (BTV) occurred in goats which exhibited symptoms characteristic of PPR. A number of samples were collected from ailing or dead goats for labrotory diagnosis. Antibody to BTV and PPRV was detected in sera samples by competitive ELISA. No PPRV antigen was detected in tissue samples like lung and spleen, however, presence of PPRV antigen in some sera samples was confirmed by sandwich ELISA. All the blood samples collected from the ailing animals were found positive for BTV antigen by a sandwich ELISA. BTV- and PPRV nucleic acids were amplified from the pooled blood and tissue samples respectively by RT-PCR assays. The identity of the amplicons was confirmed by cloning and sequencing. All these tests confirm that the goats were infected with PPRV and BTV simultaneously. Isolation of viruses from the clinical samples is underway. 相似文献
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Choi KS Nah JJ Choi CU Ko YJ Sohn HJ Libeau G Kang SY Joo YS 《Veterinary microbiology》2003,96(1):1-16
An experimental competitive enzyme-linked immunosorbent assay (morbillivirus cELISA) using a recombinant N antigen (rRPV N) expressed in a baculovirus and a ruminant morbillivirus (RPV and PPRV)-specific monoclonal antibody (P-13A9) was developed for simultaneous detection of rinderpest virus (RPV) and peste des petits ruminants virus (PPRV) antibodies and its diagnostic performance was evaluated. A set of known reference antisera against RPV and PPRV belonging to different lineages, experimental sera from cattle vaccinated for a RPV of Asian lineage, and field sera from cattle and sheep/goat populations known to be positive (West Africa) and negative (Korea) for RPV and PPRV were used for the evaluation. Morbillivirus cELISA results on the panel of experimental RPV and PPRV antisera showed high correlation (r=0.97) between the whole virus and the rRPV N antigens, suggesting that the rRPV N contains a ruminant morbillivirus-specific antigenic determinant recognized by the P-13A9 and it may be suitable as an ELISA antigen in place of the whole virus. Morbillivirus cELISA detected anti-RPV and anti-PPRV antibodies in all reference RPV and PPRV antisera containing VN titers >/=1:8, suggesting that the assay can simultaneously detect antibodies against RPV and PPRV. Anti-RPV antibody was detected by morbillivirus cELISA in vaccinated cattle as early as the VNT and continued to be detectable by both the cELISA and the VNT until termination of the study. When applied to field samples from Africa, morbillivirus cELISA showed good agreement with a RP cELISA kit (kappa value of 0.86) in bovine sera and with a peste des petits ruminant cELISA kit (kappa value of 0.81) in caprine/ovine sera. Usefulness of morbillivirus cELISA using the rRPV N protein was discussed. 相似文献
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Kariwa H Noda H Nakauchi M Ishizuka M Hashiguchi K Hashimoto S Yoshii K Asano A Agui T Kogaki H Kurano Y Uchida Y Fujii N Okada M Takashima I 《The Japanese journal of veterinary research》2008,55(4):115-127
The sudden emergence of severe acute respiratory syndrome (SARS) at the end of 2002 resulted in 774 reported deaths from more than 8000 cases worldwide. As no effective vaccines or antiviral agents are available, the most effective measure to prevent the expansion of a SARS epidemic is the rapid diagnosis and isolation of SARS patients. To establish specific diagnostic methods, we generated nine clones of monoclonal antibodies to nucleocapsid protein (NP) of SARS-coronavirus (SARS-CoV). On immunofluorescent antibody assay and Western blotting analysis, none of the monoclonal antibodies showed cross-reactivity to authentic and recombinant NPs of human coronavirus (HCoV) 229E strain. To determine the region on the NP molecule where the monoclonal antibodies bind, we generated four truncated recombinant NPs and analyzed the reactivity between monoclonal antibodies and truncated NPs. Two monoclonal antibodies reacted with a truncated NP covering from amino acid residues 111 to 230, and seven reacted with another truncated NP covering from amino acid residues 221 to 340. Epitope mapping analysis indicated that monoclonal antibody SN5-25 recognized the amino acid sequence Q(245)TVTKK(250) On SARS-NP. Within the epitope, Q245, T246, V247, K249, and K250 appeared to form an essential motif for monoclonal antibody SN5-25 to bind. The information about binding sites and epitopes of monoclonal antibodies may be useful for the development of new diagnostic methods for SARS and for analyzing the function of N protein of SARS-CoV. 相似文献
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In this study, a totally 164 materials (lung, spleen, lymph node, nasal and ocular swap, blood and samples from oral lesions)
from sheep and lambs (n = 57) in the 34 flocks suspected the PPRV infection as clinically and macroscopic pathologic remarks,
housed in the 4 different provinces in the Middle and Eastern Blacksea Region were used for RT-PCR and virus isolation. Additionally,
serum samples randomly collected from 892 sheep were tested for the detection of PPRV seroprevalance in the same regions.
The seroprevalance were estimated as 14,9% and 3,5–38,2% in the sampled animals and sampled province, respectively. While
no virus isolated in Vero cell cultures, PPRV nucleic acid was detected in 26 of 164 materials by RT-PCR. According to the
result of RT-PCR, the PPRV infection were diagnosed in 44,1% (15/34) and 31,5% (18/57) of the flocks and sampled animals,
respectively. Diagnostic value of necropsy materials such as lymph node, spleen, lung and of clinical samples such as nasal
swap and conjunctival swap were determined more valuable diagnostic materials in the diagnosis of PPRV infection by RT-PCR.
Data showed that PPRV infection was widespread in the Middle and East Blacksea Region and that the prevalence of the infection
in the region varies in accordance with the factors such as geographical conditions (climate, etc.) and the method of breeding.
Additionally, it is determined that RT-PCR is sensitive and reliable method in the diagnosis of PPRV infection. 相似文献
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本研究旨在对来源于不同宿主和地理分布的22株弓形虫的GRA25基因进行PCR扩增并测序,对获得的GRA25基因序列进行比对,利用MP和ML两种方法对不同分离株的GRA25基因构建系统进化树。利用生物信息学软件将弓形虫RH株的GRA25基因翻译成氨基酸序列,对其编码蛋白的生物学特征进行分析。结果显示,弓形虫GRA25基因序列有2种长度,分别为939和948 bp。序列比对结果显示,GRA25基因在不同虫株间有82个核苷酸变异位点,变异率为0~4.4%。进化分析结果显示,用GRA25基因不能区分弓形虫基因Ⅰ型和Ⅱ型虫株。生物信息学分析预测弓形虫GRA25蛋白含有7个亲水区域,10个α-螺旋,3个β-折叠,8个无规则卷曲和8个潜在的线性B淋巴细胞抗原表位。本研究结果表明,GRA25基因不能作为标记分子区分不同基因型的弓形虫虫株,但可能作为疫苗候选分子研制新型抗弓形虫基因疫苗或表位肽疫苗。 相似文献