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顶复门原虫是包括刚地弓形虫、疟原虫及球虫等在内的一大类寄生性原虫的总称,引起重要的人畜寄生虫病。由于药物的长期使用,对于原有的药物产生了明显的抗药性,急需新型抗寄生虫药物的出现。顶复门原虫不能利用脂肪和蛋白质作为能量来源,只能依赖己糖激酶(Hex-okinase,HK)参与的糖酵解途径提供ATP。顶复门原虫HK的基因序列、结构特征与植物等一些低等生物更为接近,而明显区别于脊椎动物和大多数的真核生物,成为研究开发药物的理想靶位。本文对顶复门原虫糖酵解途径及其关键酶进行了综述。 相似文献
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顶复门原虫包括疟原虫(Plasmodium spp.)、刚地弓形虫(Toxoplasma gondii)、艾美耳球虫(Eimeria spp.)、锥虫(Trypanosoma spp.)、泰勒虫(Theileria spp.)及巴贝斯虫(Babesia spp.)等一大类引起严重人畜疾病的寄生性原虫。顶复门原虫利用2C-甲基-D-赤藓糖醇-4-磷酸(MEP)途径合成类异戊二烯前体物质,这些化合物对于维持顶复门原虫的生存具有十分重要的作用。1-脱氧-D-木酮糖-5-磷酸(DOXP)还原异构酶是MEP途径的关键酶,对其作用机理及抑制剂的筛选研究已取得重要进展。论文对顶复门原虫类异戊二烯的MEP途径,DOXP还原异构酶的作用机理及靶标研究进展进行综述。 相似文献
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顶复门原虫包括一大类单细胞寄生性原虫,是人和动物的重要病原,会对人类健康以及畜牧业生产造成严重危害。γ-氨基丁酸是一种四碳非蛋白质氨基酸,广泛存在于生物体内。顶复门原虫的γ-氨基丁酸代谢旁路主要参与能量代谢,为虫体生长提供短期的能量储备,在虫体适应不同寄生环境过程中起着关键性作用。寄生原虫的γ-氨基丁酸代谢明显区别于哺乳动物宿主,仅限于中枢神经系统中的代谢,可在虫体入侵宿主细胞及有性生殖阶段发挥重要的作用。本文对顶复门原虫γ-氨基丁酸代谢途径及其生物学作用进行综述。 相似文献
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多胺是一类聚阳离子脂肪族化合物,广泛存在于生物体内,其在顶复门原虫的生长、发育和繁殖等多个阶段发挥着重要作用。顶复门原虫的多胺合成途径存在多样性,其与宿主细胞的经典路径不同,且顶复门原虫多胺生物合成限速酶(鸟氨酸脱羧酶与S-腺苷甲硫氨酸脱羧酶)的半衰期与宿主细胞限速酶的半衰期存在显著差异。因此,顶复门原虫多胺合成限速酶及转运载体成为抗原虫药物研发的候选靶标,以顶复门原虫多胺合成限速酶及多胺转运载体为靶标的抗寄生原虫抑制剂研究取得一定进展。论文综述了顶复门原虫多胺的生物学功能、生物合成途径及其抑制剂研究进展,以期为抗原虫药物靶标研究及新型抑制剂研发提供参考。 相似文献
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顶复门原虫电子转移链代谢及Ⅱ型NADH脱氢酶研究进展 总被引:1,自引:1,他引:0
顶复门原虫是包括刚地弓形虫、疟原虫及球虫等在内的一大类寄生性原虫的总称,可引起重要的人畜寄生虫病.抗顶复门原虫药物的长期使用,甚至是滥用,使得这类寄生虫对现有药物产生了明显的抗药性,急需开发新型药物.Ⅱ型NAD(P)H脱氢酶是电子转移链途径中的关键酶,由于其仅存在于某些植物、细菌、真菌和寄生原虫等一些低等生物体内,而在高等动物体内缺失,是研发新型抗感染性药物的重要靶标.笔者主要针对顶复门原虫线粒体电子转移链代谢途径以及Ⅱ型NAD(P)H脱氢酶的研究概况进行综述. 相似文献
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钙依赖蛋白激酶(Calcium-dependent protein kinases,CDPKs)是一类大的蛋白激酶家族,属于丝氨酸/苏氨酸类蛋白激酶,广泛存在于各种植物和原生动物中,参与多种生命活动的调控.随着生物信息学、分子生物学及基因工程的迅速发展,对顶复门原虫CDPKs的研究日益增多.研究结果表明,这类蛋白家族成员参与调控寄生虫入侵、外出宿主细胞、配子形成、宿主体内移行等顶复门原虫生活史的多个重要时期,其特殊的分子结构或可成为研究抗寄生虫疫苗或药物的候选靶标.本文以疟原虫、弓形虫和艾美耳球虫CDPKs为重点,综述了顶复门原虫CDPKs的结构、功能及生物学意义,展望了顶复门原虫CDPKs的研究和应用前景,以期为研究顶复门原虫的致病机理及研发抗原虫生物制剂提供参考. 相似文献
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Cloning and purification of the Streptococcus suis serotype 2 glyceraldehyde-3-phosphate dehydrogenase and its involvement as an adhesin 总被引:8,自引:0,他引:8
Streptococcus suis serotype 2 is a swine pathogen responsible for diverse diseases and may be present in the tonsils of pigs which show no sign of illness. Because adhesion to host cells may be important in the carrier state, this study was undertaken to characterize a 39 kDa surface protein identified as a glyceraldehyde-3-phosphate dehydrogenase (GAPDH), possibly implicated in the adhesion of the bacteria. The gene encoding for the GAPDH of S. suis was cloned and sequenced. The DNA sequence contained an open reading frame encoding for a 336 amino acid polypeptide exhibiting 95% sequence identity with the GAPDH from Streptococcus pyogenes and from other streptococci. Using the Qiaexpress expression plasmids, the gapdh gene was inducibly overexpressed in E. coli to produce GAPDH with a hexahistidyl N-terminus to permit its purification. The (His)6GAPDH protein was found to possess functional GAPDH enzymatic activity after the purification. An adherence assay with S. suis and porcine tracheal rings pre-incubated with (His)6GAPDH and non-incubated rings was showed a significant reduction in the adhesion of S. suis in the (His)6GAPDH pre-incubated rings compared to the non-incubated rings. The GAPDH protein of S. suis seems to be involved in the first steps of the bacterial adhesion to host cells. 相似文献
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Staphylococcus aureus is the most common causative agent of bovine mastitis and vaccines developed to control this disease showed limited protection due in part to the lack of common antigens among the mastitis isolates. We isolated and identified two genes encoding proteins with glyceraldehyde-3-phosphate dehydrogenase (GAPDH) activity from a S. aureus strain isolated from bovine clinical mastitis. The GapB and GapC proteins share considerable homology to the GapB and GapC products of human strains of S. aureus. These two proteins could be distinguished by their different GAPDH activities and binding to bovine transferrin properties. Both gapB and gapC genes were conserved in 11 strains tested, and the GapC protein was present on the surface of all S. aureus strains. 相似文献
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Staphylococcus aureus is recognized worldwide as a major pathogen causing clinical or subclinical intramammary infections in lactating cows, sheep and goats. S. aureus produces a wide arsenal of cell surface and extracellular proteins involved in virulence. Among these are two conserved proteins with glyceraldehyde-3-phosphate dehydrogenase (GAPDH) activity named glyceraldehyde-3-phosphate dehydrogenase-B (GapB) and -C (GapC). In this study, we used the S. aureus wild type strain RN6390 and its isogenic gapC mutant H330 in in vitro and in vivo studies and determined that the S. aureus GapC protein plays a role on adherence to and internalization into bovine mammary epithelial (MAC-T) cells. In addition, we found that S. aureus H330 did not caused mastitis after an experimental infection of ovine mammary glands. Together, these results show that GapC is important in the pathogenesis of S. aureus mastitis. 相似文献
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Identification and validation of housekeeping genes as internal control for gene expression in an intravenous LPS inflammation model in chickens 总被引:1,自引:0,他引:1
De Boever S Vangestel C De Backer P Croubels S Sys SU 《Veterinary immunology and immunopathology》2008,122(3-4):312-317
Real-time PCR has become a powerful tool for the detection of inflammatory parameters, including cytokines. Reference or housekeeping genes are used for the normalization of real-time RT-PCR results. In order to obtain reliable results, the stability of these housekeeping genes needs to be determined. In this study the stability of five genes, including beta-actin, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), hypoxanthine phophoribosyl-transferase (HPRT), ubiquitin (UB) and glucose-6-phosphate dehydrogenase (G6PDH), was determined in a lipopolysaccharide inflammation model in chickens. beta-Actin appeared to be the most stable single gene in our model. Because the use of a single gene for normalization can lead to relatively large errors, the use of the geometric mean of multiple reference genes or normalization factor is preferred. The most stable combination for gene expression analysis in this lipopolysaccharide inflammation model in chickens is G6PDH and UB, since their correlation coefficients were 0.953 and 0.969, respectively (BestKeeper) and an M value of 0.34 and a low V(2/3) value of 0.155 (geNorm) were obtained. The use of HPRT and GAPDH should be avoided. The stable housekeeping genes, G6PDH and UB together, can be used to normalize the expression of pro-inflammatory cytokines in a lipopolysaccharide inflammation model in chickens. 相似文献
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Adhesion activity of glyceraldehyde-3-phosphate dehydrogenase in a Chinese Streptococcus suis type 2 strain 总被引:1,自引:0,他引:1
A total of 36 streptococcal strains, including seven S. equi ssp.zooepidemicus, two S. suis type 1 (SS1), 24 SS2, two SS9, and one SS7, were tested for glyceraldehyde-3-phosphate dehydrogenase gene (gapdh). Except from non-virulent SS2 strain T1 5, all strains harboured gapdh.The gapdh of Chinese Sichuan SS2 isolate ZY05719 and Jiangsu SS2 isolate HA9801 were sequenced and then compared with published sequences in the GenBank.The comparison revealed a 99.9 % and 99.8 % similarity of ZY05719 and HA9801, respectively, with the published sequence. Adherence assay data demonstrated a significant ((p<0.05)) reduction in adhesion of SS2 in HEp-2 cells pre-incubated with purified GAPDH compared to non pre-incubated controls, suggesting the GAPDH mediates SS2 bacterial adhesion to host cells. 相似文献
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鹿茸组织中内参基因的筛选和验证 总被引:1,自引:1,他引:0
为筛选在不同生长时期鹿茸组织中稳定表达的内参基因,试验以不同生长时期(分别为脱盘后10、20、40和60 d)的鹿茸组织为材料,采用实时荧光定量PCR(qRT-PCR)方法分析甘油醛-3-磷酸脱氢酶(GAPDH)、β2-微球蛋白(B2M)、还原型辅酶Ⅰ(NADH)、60S 核糖体蛋白L40(RPL40)、谷胱甘肽还原酶7(GPx)和β肌动蛋白(ACTB)6个看家基因的表达情况,并运用 geNorm和NormFinder 两个程序综合分析6个看家基因的表达稳定性.结果显示,GAPDH、ACTB、RPL40表达稳定性较好,可用作鹿茸基因表达研究的内参基因,而NADH和GPx的稳定性最差,不适合作内参基因.通过对鹿茸生长相关基因(ANXA5、HSP27、PRD2、CRABP1、LGALS1)表达分析,进一步验证了上述结果,并且发现这5种基因均在脱盘后10 d的鹿茸组织中高表达.该研究结果为鹿茸快速生长及骨化相关基因的研究奠定了一定基础. 相似文献