Bacterial artificial chromosomes(BACs)or yeast artificial chromosomes(YACs)containing large inserts as probes for fluorescence in situ hybridization(FISH)have been used in the physical mapping of specific DNA sequence...Bacterial artificial chromosomes(BACs)or yeast artificial chromosomes(YACs)containing large inserts as probes for fluorescence in situ hybridization(FISH)have been used in the physical mapping of specific DNA sequences,especially for single-or low-copy sequences.Our earlier study identified Stpk-V,a powdery mildew resistance-related gene located on the 6VS chromosome arm of the wild grass Haynaldia villosa(tribe Triticeae),and obtained several Triticum aestivum–H.villosa alien chromosome lines carrying the Stpk-V gene.However,the precise physical location of the Stpk-V gene on chromosome 6VS is not known.In this study,we used TAC-FISH with TAC15 as the probe coupled with sequential genomic in situ hybridization(GISH)to determine the physical location of the Stpk-V gene in different T.aestivum–H.villosa 6V alien chromosome lines,including addition,substitution and translocation lines.The result indicated that the fraction length of the Stpk-V locus is 0.575±0.035 on the 6V chromosome short arm and this was confirmed by FISH using TAC15 as the probe for tracing the Stpk-V gene in other genetic stocks.The cytological mapping strategies used in this study will be of benefit for tracing the alien gene location in the course of introducing desirable traits from wild species.展开更多
旨在探究丝氨酸苏氨酸蛋白激酶(serine/threonine protein kinase,STPK)基因在棉纤维发育中的功能,解析棉纤维细胞的分化和发育机理。从陆地棉遗传标准系TM-1中克隆基因GhD6PKL2,并对其序列及结构特征进行生物信息学分析、表达量分析及...旨在探究丝氨酸苏氨酸蛋白激酶(serine/threonine protein kinase,STPK)基因在棉纤维发育中的功能,解析棉纤维细胞的分化和发育机理。从陆地棉遗传标准系TM-1中克隆基因GhD6PKL2,并对其序列及结构特征进行生物信息学分析、表达量分析及过表达拟南芥的表型观察。GhD6PKL2含有典型的STPK保守序列位点。预测编码的蛋白相对分子质量为49.74 kD,等电点为6.17,含有多个丝氨酸苏氨酸磷酸化位点。表达模式结果表明,GhD6PKL2在与棉花纤维伸长阶段相吻合的、开花后20 d显著高表达。软件预测及在烟草叶片中的荧光蛋白定位结果均显示,GhD6PKL2编码的蛋白质定位在细胞膜上。诱饵自激活试验验证GhD6PKL2没有自激活活性及毒性。过表达拟南芥,能使转基因拟南芥表现出表皮毛数量增多,同时主根变短、侧根数目增多的表型。表明该丝氨酸苏氨酸蛋白激酶基因在拟南芥表皮毛及主侧根发育方面发挥一定作用,可能为一个棉纤维伸长发育阶段的潜在调控基因。展开更多
【目的】丝氨酸/苏氨酸蛋白激酶K(Serine/Threonine protein kinases K)是分枝杆菌类似真核样的蛋白激酶,预测在分枝杆菌的生长和新陈代谢等生理过程中起着重要的作用,解析PknK的生物功能及作用机制,将为结核病的防治提供一定的理论基...【目的】丝氨酸/苏氨酸蛋白激酶K(Serine/Threonine protein kinases K)是分枝杆菌类似真核样的蛋白激酶,预测在分枝杆菌的生长和新陈代谢等生理过程中起着重要的作用,解析PknK的生物功能及作用机制,将为结核病的防治提供一定的理论基础。【方法】通过基因敲除等遗传方法获得结核分枝杆菌疫苗株BCG的pknK敲除菌株△pknK、回补菌株pMV361-pknK/△pknK和过表达菌株pMV261-pknK/BCG;对获得的菌株进行生长曲线测定和抗药性分析;通过pulldown-MS方法及生物信息学方法鉴定了PknK相互作用蛋白。【结果】监测各种分枝杆菌△pknK、pMV361-pknK/△pknK和pMV261-pknK/BCG生长,确定PknK负调控BCG生长;抗药性分析显示PknK降低BCG的耐药性;pulldown-MS方法显示PknK与丝氨酸/苏氨酸蛋白激酶PknA和双组分系统中的反应调节因子MtrA、TrcR、MoxR等蛋白相互作用。【结论】研究发现PknK调控分枝杆菌的生长和耐药性,我们的研究为深入研究PknK在结核分枝杆菌中的功能奠定了基础。展开更多
基金supported by the National Basic Research Program of China(2009CB118304)the National Natural Science Foundation of China(31171540,30871519)+2 种基金the Program for New Century Excellent Talents in University(NCET-10-0496)the Independent Innovation of Agricultural Sciences(CX(11)1025)the Sci&Tech Project in Jiangsu Province(BE2011306)
文摘Bacterial artificial chromosomes(BACs)or yeast artificial chromosomes(YACs)containing large inserts as probes for fluorescence in situ hybridization(FISH)have been used in the physical mapping of specific DNA sequences,especially for single-or low-copy sequences.Our earlier study identified Stpk-V,a powdery mildew resistance-related gene located on the 6VS chromosome arm of the wild grass Haynaldia villosa(tribe Triticeae),and obtained several Triticum aestivum–H.villosa alien chromosome lines carrying the Stpk-V gene.However,the precise physical location of the Stpk-V gene on chromosome 6VS is not known.In this study,we used TAC-FISH with TAC15 as the probe coupled with sequential genomic in situ hybridization(GISH)to determine the physical location of the Stpk-V gene in different T.aestivum–H.villosa 6V alien chromosome lines,including addition,substitution and translocation lines.The result indicated that the fraction length of the Stpk-V locus is 0.575±0.035 on the 6V chromosome short arm and this was confirmed by FISH using TAC15 as the probe for tracing the Stpk-V gene in other genetic stocks.The cytological mapping strategies used in this study will be of benefit for tracing the alien gene location in the course of introducing desirable traits from wild species.
文摘旨在探究丝氨酸苏氨酸蛋白激酶(serine/threonine protein kinase,STPK)基因在棉纤维发育中的功能,解析棉纤维细胞的分化和发育机理。从陆地棉遗传标准系TM-1中克隆基因GhD6PKL2,并对其序列及结构特征进行生物信息学分析、表达量分析及过表达拟南芥的表型观察。GhD6PKL2含有典型的STPK保守序列位点。预测编码的蛋白相对分子质量为49.74 kD,等电点为6.17,含有多个丝氨酸苏氨酸磷酸化位点。表达模式结果表明,GhD6PKL2在与棉花纤维伸长阶段相吻合的、开花后20 d显著高表达。软件预测及在烟草叶片中的荧光蛋白定位结果均显示,GhD6PKL2编码的蛋白质定位在细胞膜上。诱饵自激活试验验证GhD6PKL2没有自激活活性及毒性。过表达拟南芥,能使转基因拟南芥表现出表皮毛数量增多,同时主根变短、侧根数目增多的表型。表明该丝氨酸苏氨酸蛋白激酶基因在拟南芥表皮毛及主侧根发育方面发挥一定作用,可能为一个棉纤维伸长发育阶段的潜在调控基因。
文摘【目的】丝氨酸/苏氨酸蛋白激酶K(Serine/Threonine protein kinases K)是分枝杆菌类似真核样的蛋白激酶,预测在分枝杆菌的生长和新陈代谢等生理过程中起着重要的作用,解析PknK的生物功能及作用机制,将为结核病的防治提供一定的理论基础。【方法】通过基因敲除等遗传方法获得结核分枝杆菌疫苗株BCG的pknK敲除菌株△pknK、回补菌株pMV361-pknK/△pknK和过表达菌株pMV261-pknK/BCG;对获得的菌株进行生长曲线测定和抗药性分析;通过pulldown-MS方法及生物信息学方法鉴定了PknK相互作用蛋白。【结果】监测各种分枝杆菌△pknK、pMV361-pknK/△pknK和pMV261-pknK/BCG生长,确定PknK负调控BCG生长;抗药性分析显示PknK降低BCG的耐药性;pulldown-MS方法显示PknK与丝氨酸/苏氨酸蛋白激酶PknA和双组分系统中的反应调节因子MtrA、TrcR、MoxR等蛋白相互作用。【结论】研究发现PknK调控分枝杆菌的生长和耐药性,我们的研究为深入研究PknK在结核分枝杆菌中的功能奠定了基础。