【目的】深入研究甘蓝自交不亲和信号传导关键元件S-位点受体激酶SRK与臂重复蛋白ARC1及ARC1与Exo70A1间相互识别的分子机理,鉴定SRK-ARC1及ARC1-Exo70A1之间的互作区段,并分析其作用强度,明确蛋白间互作功能域。【方法】通过生物信息...【目的】深入研究甘蓝自交不亲和信号传导关键元件S-位点受体激酶SRK与臂重复蛋白ARC1及ARC1与Exo70A1间相互识别的分子机理,鉴定SRK-ARC1及ARC1-Exo70A1之间的互作区段,并分析其作用强度,明确蛋白间互作功能域。【方法】通过生物信息学分析得到蛋白功能域,根据分析结果以典型的自交不亲和结球甘蓝E1为材料分别扩增SRK、ARC1和Exo70A1含不同功能域的截短体片段,利用分子克隆技术将SRK激酶域(SRKj)及其截短体SRKjΔ1—SRKjΔ4,Exo70A1全长及其截短体Exo70A1Δ1—Exo70A1Δ3的编码序列分别亚克隆至p GADT7(AD)质粒,将ARC1及其截短体ARC1Δ1—ARC1Δ8的编码序列分别亚克隆至载体p GBKT7(BD)质粒。用PEG/Li Ac法将获得的AD和BD重组质粒两两组合分别共转化到酵母AH109感受态中,观察融合菌株在SD/-Leu-Trp-His-Ade/X-α-gal/25 m M 3-AT平板上的菌落生长情况和颜色变化情况,进一步测定其β-半乳糖苷酶活性。最后通过原核表达体外孵育检测蛋白质相互作用的方法对SRK-ARC1及ARC1-Exo70A1的相互作用进行验证。【结果】DNA测序和内切酶分析显示成功构建18个酵母双杂交表达载体,且无自激活能力。在SRK-ARC1的10个试验组合中,只有ARC1Δ4、ARC1Δ8、ARC1与SRKj组合的融合菌株在SD/-Leu-Trp-His-Ade/X-α-gal/25 m M 3-AT培养基上长出蓝色菌落,激活报告基因HIS3、ADE2和MEL1。随着SRKj或ARC1截短体片段的延长,二者的β-半乳糖苷酶活性逐渐增加,其中,ARC1Δ4与SRKj组合的β-半乳糖苷酶活性最高(酶活为15.98)。在ARC1-Exo70A1 16个试验组合中,Exo70A1Δ3与ARC1Δ1Δ3都相互作用,其融合菌株在SD/-Leu-Trp-His-Ade/X-α-gal/25 m M 3-AT培养基上长出蓝色菌落,激活报告基因HIS3、ADE2和MEL1。随着ARC1或Exo70A1截短体片段的延长,二者的β-半乳糖苷酶活性呈现先增加后降低的趋势,其中ARC1Δ2与Exo70A1Δ3组合的β-半乳糖苷酶活性最大(酶活性为25.07)。说明ARC1的N端和Exo70A1的N端发生了互作,而ARC1的C端、全长与Exo70A1都不发生互作。体外表达检测蛋白相互作用发现,SRKj与ARC1Δ4、ARC1Δ2与Exo70A1Δ3均可以直接发生相互作用。【结论】SRK的激酶域(SRKj)与ARC1的C端臂重复区发生互作,缩短SRK激酶域中的任何结构域或者缩短ARC1的臂重复区,二者都不会发生互作。ARC1的亮氨酸拉链和蜷曲螺旋与Exo70A1的N端结构域(去除pfam Exo70A1域)介导了二者的相互作用。SRK-ARC1的作用力强度小于ARC1-Exo70A1的作用力强度。展开更多
核酸外切酶1(exonuclease 1,EXO1)已被证明在一些肿瘤中可作为具有临床意义的生物标志物,然而其在肺腺癌中的作用尚不清楚。为了研究EXO1在肺腺癌中的作用,我们首先利用癌症基因组图谱数据集(the cancer genome atlas,TCGA)对肺腺癌患...核酸外切酶1(exonuclease 1,EXO1)已被证明在一些肿瘤中可作为具有临床意义的生物标志物,然而其在肺腺癌中的作用尚不清楚。为了研究EXO1在肺腺癌中的作用,我们首先利用癌症基因组图谱数据集(the cancer genome atlas,TCGA)对肺腺癌患者各临床特征与EXO1表达量之间的关系进行了生物信息学分析,并通过蛋白质免疫印迹和CCK-8实验在肺腺癌细胞株中进行验证。结果显示,EXO1在肺腺癌中呈现高表达,并且其表达程度与肺腺癌的临床分期相关,我们推测EXO1是影响肺腺癌总体生存的独立危险因素;此外,通过基因富集分析确定了EXO1与DNA传感途径、碱基切除修复、DNA复制、细胞周期、P53信号通路和ERBB信号通路有关,这些途径在高EXO1表达的肺腺癌中高度富集。蛋白免疫印迹和CCK-8实验结果显示,EXO1在肺腺癌细胞中高表达,干扰EXO1表达水平可以抑制肺腺癌细胞的增殖能力。本研究证明了EXO1在肺腺癌的中高表达水平,它可以作为潜在的独立预后分子标志物,为肺腺癌患者的诊断治疗和预后评价提供新思路。展开更多
The exocyst is a conserved protein complex,and required for vesicles tethering,fusion and polarized exocytosis.Exo70A1,the exocyst subunit,is essential for assembly of the exocyst complex.To better understand potentia...The exocyst is a conserved protein complex,and required for vesicles tethering,fusion and polarized exocytosis.Exo70A1,the exocyst subunit,is essential for assembly of the exocyst complex.To better understand potential roles of Exo70A1 in non-heading Chinese cabbage（Brassica campestris ssp.chinensis）,we obtained the full-length cDNA of Exo70A1 gene,which consisted of 1 917 bp and encoded a protein of 638 amino acids.BlastX showed BcExo70A1 shared 94.9% identity with Brassica oleracea var.acephala（AEI26267.1）,and clustered into a same group with other homologues in B.oleracea var.acephala and Brassica napus.Subcellular localization analysis showed BcExo70A1 was localized to punctate structures in cytosol of onion epithelial cells.Results showed that BcExo70A1 was widely presented in stamens,young stems,petals,unpollinated pistils,roots and leaves of self compatible and incompatible plants.The transcripts of BcExo70A1 in non- heading Chinese cabbage declined during initial 1.5 h after incompatible pollination,while an opposite trend was presented after compatible pollination.Our study reveals that BcExo70A1 could play essential roles in plant growth and development,and is related to the rejection of self pollen in non-heading Chinese cabbage.展开更多
文摘【目的】深入研究甘蓝自交不亲和信号传导关键元件S-位点受体激酶SRK与臂重复蛋白ARC1及ARC1与Exo70A1间相互识别的分子机理,鉴定SRK-ARC1及ARC1-Exo70A1之间的互作区段,并分析其作用强度,明确蛋白间互作功能域。【方法】通过生物信息学分析得到蛋白功能域,根据分析结果以典型的自交不亲和结球甘蓝E1为材料分别扩增SRK、ARC1和Exo70A1含不同功能域的截短体片段,利用分子克隆技术将SRK激酶域(SRKj)及其截短体SRKjΔ1—SRKjΔ4,Exo70A1全长及其截短体Exo70A1Δ1—Exo70A1Δ3的编码序列分别亚克隆至p GADT7(AD)质粒,将ARC1及其截短体ARC1Δ1—ARC1Δ8的编码序列分别亚克隆至载体p GBKT7(BD)质粒。用PEG/Li Ac法将获得的AD和BD重组质粒两两组合分别共转化到酵母AH109感受态中,观察融合菌株在SD/-Leu-Trp-His-Ade/X-α-gal/25 m M 3-AT平板上的菌落生长情况和颜色变化情况,进一步测定其β-半乳糖苷酶活性。最后通过原核表达体外孵育检测蛋白质相互作用的方法对SRK-ARC1及ARC1-Exo70A1的相互作用进行验证。【结果】DNA测序和内切酶分析显示成功构建18个酵母双杂交表达载体,且无自激活能力。在SRK-ARC1的10个试验组合中,只有ARC1Δ4、ARC1Δ8、ARC1与SRKj组合的融合菌株在SD/-Leu-Trp-His-Ade/X-α-gal/25 m M 3-AT培养基上长出蓝色菌落,激活报告基因HIS3、ADE2和MEL1。随着SRKj或ARC1截短体片段的延长,二者的β-半乳糖苷酶活性逐渐增加,其中,ARC1Δ4与SRKj组合的β-半乳糖苷酶活性最高(酶活为15.98)。在ARC1-Exo70A1 16个试验组合中,Exo70A1Δ3与ARC1Δ1Δ3都相互作用,其融合菌株在SD/-Leu-Trp-His-Ade/X-α-gal/25 m M 3-AT培养基上长出蓝色菌落,激活报告基因HIS3、ADE2和MEL1。随着ARC1或Exo70A1截短体片段的延长,二者的β-半乳糖苷酶活性呈现先增加后降低的趋势,其中ARC1Δ2与Exo70A1Δ3组合的β-半乳糖苷酶活性最大(酶活性为25.07)。说明ARC1的N端和Exo70A1的N端发生了互作,而ARC1的C端、全长与Exo70A1都不发生互作。体外表达检测蛋白相互作用发现,SRKj与ARC1Δ4、ARC1Δ2与Exo70A1Δ3均可以直接发生相互作用。【结论】SRK的激酶域(SRKj)与ARC1的C端臂重复区发生互作,缩短SRK激酶域中的任何结构域或者缩短ARC1的臂重复区,二者都不会发生互作。ARC1的亮氨酸拉链和蜷曲螺旋与Exo70A1的N端结构域(去除pfam Exo70A1域)介导了二者的相互作用。SRK-ARC1的作用力强度小于ARC1-Exo70A1的作用力强度。
文摘核酸外切酶1(exonuclease 1,EXO1)已被证明在一些肿瘤中可作为具有临床意义的生物标志物,然而其在肺腺癌中的作用尚不清楚。为了研究EXO1在肺腺癌中的作用,我们首先利用癌症基因组图谱数据集(the cancer genome atlas,TCGA)对肺腺癌患者各临床特征与EXO1表达量之间的关系进行了生物信息学分析,并通过蛋白质免疫印迹和CCK-8实验在肺腺癌细胞株中进行验证。结果显示,EXO1在肺腺癌中呈现高表达,并且其表达程度与肺腺癌的临床分期相关,我们推测EXO1是影响肺腺癌总体生存的独立危险因素;此外,通过基因富集分析确定了EXO1与DNA传感途径、碱基切除修复、DNA复制、细胞周期、P53信号通路和ERBB信号通路有关,这些途径在高EXO1表达的肺腺癌中高度富集。蛋白免疫印迹和CCK-8实验结果显示,EXO1在肺腺癌细胞中高表达,干扰EXO1表达水平可以抑制肺腺癌细胞的增殖能力。本研究证明了EXO1在肺腺癌的中高表达水平,它可以作为潜在的独立预后分子标志物,为肺腺癌患者的诊断治疗和预后评价提供新思路。
基金supported by the National Basic Research Program of China(973 Program,2009CB119001)the Fundamental Research Funds for the Central Universities of China(KYZ201111)+1 种基金the Natural Science Foundation of Jiangsu Province,China(BK2011643)the Scientific Innovation Research of College Graduate of Jiangsu Province,China(CXLX11_0688)
文摘The exocyst is a conserved protein complex,and required for vesicles tethering,fusion and polarized exocytosis.Exo70A1,the exocyst subunit,is essential for assembly of the exocyst complex.To better understand potential roles of Exo70A1 in non-heading Chinese cabbage（Brassica campestris ssp.chinensis）,we obtained the full-length cDNA of Exo70A1 gene,which consisted of 1 917 bp and encoded a protein of 638 amino acids.BlastX showed BcExo70A1 shared 94.9% identity with Brassica oleracea var.acephala（AEI26267.1）,and clustered into a same group with other homologues in B.oleracea var.acephala and Brassica napus.Subcellular localization analysis showed BcExo70A1 was localized to punctate structures in cytosol of onion epithelial cells.Results showed that BcExo70A1 was widely presented in stamens,young stems,petals,unpollinated pistils,roots and leaves of self compatible and incompatible plants.The transcripts of BcExo70A1 in non- heading Chinese cabbage declined during initial 1.5 h after incompatible pollination,while an opposite trend was presented after compatible pollination.Our study reveals that BcExo70A1 could play essential roles in plant growth and development,and is related to the rejection of self pollen in non-heading Chinese cabbage.
