首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 93 毫秒
1.
摘要 目的:探讨鼻咽癌组织中胶原三股螺旋重复蛋白1(CTHRC1)信使核糖核酸(mRNA)、细胞凋亡抑制蛋白2 (c-IAP2)mRNA表达与临床病理特征和预后的关系。方法:选择2016年5月至2019年1月我院收治的82例鼻咽癌患者,取活检鼻咽癌组织,采用实时荧光定量聚合酶链反应(qRT-PCR)检测CTHRC1 mRNA、c-IAP2 mRNA表达,患者治疗结束后接受定期电话随访或定期回院复查,随访持续时间为3年。比较不同临床病理特征鼻咽癌组织中CTHRC1、c-IAP2 mRNA表达差异,绘制Kaplan-Meier生存曲线,分析不同CTHRC1 mRNA、c-IAP2 mRNA表达的鼻咽癌患者3年总生存率(OS)差异。单因素和多因素Cox比例风险回归模型分析影响鼻咽癌患者预后的危险因素。结果:低度分化、TNM Ⅳ期、淋巴结转移、颅底侵犯的鼻咽癌组织中CTHRC1mRNA、c-IAP2 mRNA表达均高于高、中度分化、TNM Ⅲ期、无淋巴结转移、无颅底侵犯的鼻咽癌组织(P<0.05)。CTHRC1mRNA高表达、c-IAP2 mRNA高表达患者3年OS低于CTHRC1mRNA低表达、c-IAP2 mRNA低表达患者(log-rank χ2=7.088、5.511,P<0.05)。多因素Cox比例风险回归分析结果显示TNM分期IV期、淋巴结转移、高表达CTHRC1mRNA、高表达c-IAP2 mRNA是鼻咽癌患者预后不良的危险因素(P<0.05)。结论:鼻咽癌组织 CTHRC1 mRNA、c-IAP2 mRNA表达均异常升高,高表达CTHRC1 mRNA、c-IAP2 mRNA与鼻咽癌恶性病理特征以及预后不良有关。  相似文献   

2.
摘要 目的:探讨肌层浸润性膀胱癌(MIBC)组织赖氨酸甲基转移酶2D(KMT2D)、微小染色体维持蛋白6(MCM6)与临床病理特征和预后的关系。方法:选择2017年5月至2019年10月长治医学院附属和平医院行手术治疗的MIBC患者96例,应用逆转录-实时定量聚合酶链式反应(qRT-PCR)检测癌组织及癌旁正常组织KMT2D 信使核糖核酸(mRNA)、MCM6 mRNA表达,分析KMT2D mRNA、MCM6 mRNA表达与MIBC患者临床病理特征的关系,应用Pearson相关分析法分析MIBC患者癌组织KMT2D mRNA及MCM6 mRNA表达的相关性。随访3年,比较死亡MIBC患者与存活MIBC患者癌组织KMT2D mRNA、MCM6 mRNA表达,并应用Kaplan-Meier生存曲线分析不同KMT2D mRNA、MCM6 mRNA表达分组MIBC患者预后情况。结果:MIBC癌组织中KMT2D mRNA表达水平显著低于癌旁组织,MCM6 mRNA表达水平显著高于癌旁组织(P<0.05)。MIBC患者癌组织中KMT2D mRNA、MCM6 mRNA表达与侵犯输尿管、淋巴结转移、TNM分期显著相关(P<0.05),且两者表达呈负相关(P<0.05)。至随访截止,MIBC患者死亡45例,死亡组患者癌组织中KMT2D mRNA表达水平显著低于存活组、MCM6 mRNA表达水平显著高于存活组(P<0.05)。生存曲线结果显示KMT2D mRNA高表达组3年生存率显著高于KMT2D mRNA低表达组;MCM6 mRNA低表达组3年生存率显著高于MCM6 mRNA高表达组(P<0.05)。结论:MIBC癌组织中KMT2D低表达、MCM6高表达,与MIBC侵犯输尿管、淋巴结转移、TNM分期及患者预后不良有关。  相似文献   

3.
摘要 目的:探讨胃癌组织长链非编码核糖核酸(lncRNA)HIT000218960的表达及其与患者临床病理特征及预后的关系。方法:选择2018年1月至2019年6月于中国人民解放军联勤保障部队第九七Ο医院进行手术切除治疗的103例胃癌患者及进行胃粘膜活检的健康体检志愿者62例,取其对应组织,应用逆转录-定量聚合酶链式反应(RT-qPCR)检测组织中lncRNA HIT000218960及高迁移率族蛋白A2(HMGA2)信使RNA(mRNA)表达,应用免疫组织化学法检测组织中HMGA2阳性表达。分析lncRNA HIT000218960表达与胃癌患者临床病理特征的关系。随访3年,应用Kaplan-Meier生存曲线分析不同lncRNA HIT000218960分组患者预后情况,并应用Cox回归分析胃癌患者预后的影响因素。结果:胃癌组织中lncRNA HIT000218960、HMGA2 mRNA表达水平显著高于正常胃粘膜组织(P<0.05),HMGA2蛋白阳性表达率显著高于正常胃粘膜组织(P<0.05)。胃癌组织中lncRNA HIT000218960表达与肿瘤直径、组织分化程度、TNM分期、淋巴结转移显著相关(P<0.05)。lncRNA HIT000218960水平与HMGA2 mRNA表达呈正相关(r=0.462,P<0.05)。lncRNA HIT000218960低表达组3年生存率显著高于lncRNA HIT000218960高表达组(P<0.05)。Cox回归显示,肿瘤组织中低分化、TNM分期Ⅲ期、淋巴结转移、lncRNA HIT000218960高表达、HMGA2 mRNA高表达是胃癌患者预后不良的危险因素(P<0.05)。结论:胃癌组织中存在lncRNA HIT000218960异常高表达,其与胃癌恶性进展及患者预后不良有关。  相似文献   

4.
摘要 目的:探讨乳腺癌组织叉头框蛋白P3(FOXP3)、高迁移率族蛋白A2(HMGA2)、大鼠肉瘤蛋白活化因子2(RASAL2)的表达及其与临床病理特征和预后的关系。方法:选取2014年6月至2015年6月期间我院收治的102例乳腺癌患者作为研究对象。检测乳腺癌组织以及癌旁组织中FOXP3、HMGA2、RASAL2表达,分析FOXP3、HMGA2、RASAL2表达与临床病理参数的相关性。Kaplan-Meier生存曲线分析不同FOXP3、HMGA2、RASAL2表达患者总生存率的差异。Cox比例风险回归模型分析乳腺癌患者预后的影响因素。结果:与癌旁组织相比,乳腺癌组织中FOXP3、HMGA2阳性表达率升高,而RASAL2阳性表达率降低(P<0.05)。FOXP3、HMGA2、RASAL2表达均与TNM分期和淋巴结转移相关(P<0.05)。FOXP3、HMGA2阳性患者的生存率明显低于FOXP3、HMGA2阴性患者,RASAL2阳性患者的生存率明显高于RASAL2阴性患者(P<0.05)。TNM分期Ⅲ期、FOXP3阳性表达、HMGA2阳性表达是影响乳腺癌患者预后的危险因素(P<0.05),而RASAL2阳性表达是乳腺癌患者预后的保护因素(P<0.05)。结论:乳腺癌组织中FOXP3和HMGA2阳性表达率升高,而RASAL2阳性表达率降低,FOXP3和HMGA2阳性表达以及RASAL2阴性表达与乳腺癌患者TNM分期、淋巴结转移相关,并且是患者预后不良的影响因素。  相似文献   

5.
摘要 目的:探讨肝细胞癌(HCC)癌组织神经降压素(NTS)、鞘氨醇-1-磷酸转运体2(SPNS2)、热休克蛋白75(Mortalin)表达与上皮间质转化(EMT)标志物、临床病理特征和预后的关系。方法:选取2010年1月~2017年1月联勤保障部队第九〇〇医院仓山院区收治的90例HCC患者,采用免疫组化法检测患者癌组织和对应癌旁组织中NTS、SPNS2、Mortalin及EMT标志物N-钙粘蛋白(N-Cad)、E-钙粘蛋白(E-Cad)表达情况。分析NTS、SPNS2、Mortalin表达与HCC患者EMT标志物、临床病理特征和预后的关系。结果:HCC癌组织中NTS、SPNS2、Mortalin、N-Cad阳性表达率高于癌旁组织,E-Cad阳性表达率低于癌旁组织(P<0.05)。Pearson相关性分析显示,HCC癌组织中NTS、SPNS2、Mortalin表达水平与N-Cad表达水平呈正相关,与E-Cad表达水平呈负相关(P<0.05)。 HCC癌组织中NTS、SPNS2、Mortalin表达与Child-Pugh分级、血管侵犯、巴塞罗那临床肝癌(BCLC)分期、淋巴结转移、远处转移有关(P<0.05)。90例HCC患者术后5年总生存率为48.89%(44/90)。Kaplan-Meier生存曲线分析显示,NTS、SPNS2、Mortalin阳性组总生存率分别低于NTS、SPNS2、Mortalin阴性组(P<0.05)。结论:HCC癌组织中NTS、SPNS2、Mortalin表达上调,与EMT、Child-Pugh分级、血管侵犯、BCLC分期、淋巴结转移、远处转移和预后有关,可作为HCC病情及预后的辅助评估指标。  相似文献   

6.
摘要 目的:探讨非小细胞肺癌(NSCLC)组织驱动蛋白超家族成员2A(KIF2A)、驱动蛋白超家族成员2C(KIF2C)、驱动蛋白超家族成员20A(KIF20A)信使核糖核酸(mRNA)表达与临床病理特征和预后的关系。方法:选择2016年9月至2019年9月天津医科大学总医院手术切除的NSCLC患者106例,取其癌组织及其对应的癌旁组织,应用荧光定量聚合酶链式反应(RT-qPCR)检测组织中KIF2A、KIF2C、KIF20A mRNA表达,分析其与临床病理特征的关系。应用 Pearson相关性分析NSCLC组织中KIF2A、KIF2C、KIF20A mRNA表达间的关系。随访3年,应用Kaplan-Meier生存曲线分析KIF2A、KIF2C、KIF20A mRNA表达与患者预后关系。结果:NSCLC癌组织中KIF2A、KIF2C、KIF20A mRNA表达水平显著高于癌旁组织(P<0.05)。低分化、淋巴结转移、临床分期Ⅲ A 期NSCLC癌组织中KIF2A、KIF2C、KIF20A mRNA表达水平显著高于中高分化、无淋巴结转移及临床分期I、II期NSCLC癌组织(P<0.05)。Pearson相关分析显示,NSCLC癌组织中KIF2A mRNA表达与KIF2CmRNA、KIF20A mRNA表达呈正相关,KIF2C mRNA表达与KIF20A mRNA表达呈正相关(P<0.05)。Kaplan-Meier法分析显示KIF2A mRNA低表达组、KIF2C mRNA低表达组、KIF20A mRNA低表达组3年生存率分别为(84.78%,86.27%,81.48%)显著高于KIF2A mRNA高表达组、KIF2C mRNA高表达组、KIF20A mRNA高表达组(59.62%,55.32%,59.09%)(P<0.05)。结论:KIF2A、KIF2C、KIF20A mRNA在NSCLC组织中存在高表达,且与低分化、淋巴结转移、临床分期及预后有关。  相似文献   

7.
摘要 目的:探讨过氧化物酶1(PRDX1)、高迁移率族蛋白A2(HMGA2)、同源形成素样蛋白2(FMNL2)在胃癌组织中的表达及与临床病理特征、上皮-间充质转化(EMT)和预后的关系。方法:选取2017年1月~2018年2月我院收治的153例胃癌患者,收集术中癌组织和癌旁组织。采用免疫组化法检测PRDX1、HMGA2、FMNL2、波形蛋白(VIM)、上皮细胞钙黏蛋白(E-cad)阳性表达情况,采用实时定量PCR(qRT-PCR)法检测PRDX1、HMGA2、FMNL2、VIM、E-cad mRNA相对表达量。分析胃癌组织中PRDX1、HMGA2、FMNL2表达与临床病理特征、EMT和预后的关系。结果:与癌旁组织比较,胃癌组织中PRDX1、HMGA2、FMNL2、VIM阳性表达率和mRNA相对表达量升高,E-cad阳性表达率和mRNA相对表达量降低(P<0.05)。胃癌组织中PRDX1、HMGA2、FMNL2阳性表达率与患者TNM分期、淋巴结转移、远处转移有关(P<0.05)。Pearson相关性分析结果显示,胃癌组织中PRDX1、HMGA2、FMNL2 mRNA相对表达量与VIM mRNA相对表达量呈正相关(r=0.562、0.517、0.621,P均<0.05),与E-cad mRNA相对表达量呈负相关(r=-0.603、-0.544、-0.574,P均<0.05)。153例胃癌患者术后3年累积生存率为68.44%(106/153)。Kaplan-Meier生存曲线分析结果显示,PRDX1、HMGA2、FMNL2阳性组术后3年累积生存率均低于阴性组(P<0.05)。结论:胃癌组织中PRDX1、HMGA2、FMNL2表达升高,其表达与TNM分期、淋巴结转移、远处转移、EMT以及预后有关,可作为胃癌病情和预后的辅助评估指标。  相似文献   

8.
摘要 目的:探讨系统性免疫炎症指数(SII)、血小板计数和中性粒细胞与淋巴细胞比值(COP-NLR)评分与局部晚期鼻咽癌患者临床病理特征和预后的关系。方法:选择2015年1月到2017年12月徐州医科大学附属医院收治的94例局部晚期鼻咽癌患者,计算SII和COP-NLR评分,受试者工作特征(ROC)曲线确定治疗前SII的最佳临界值,比较不同SII、COP-NLR评分局部晚期鼻咽癌患者临床病理特征的差异。绘制Kaplan-Meier生存曲线分析不同SII、COP-NLR评分的局部晚期鼻咽癌患者总生存期(OS)的差异,单因素和多因素Cox回归分析影响患者预后的危险因素。结果:根据SII最佳临界值、COP-NLR评分标准将局部晚期鼻咽癌患者分为低SII组(46例)和高SII组(48例),低COP-NLR组(0-1分,45例)和高COP-NLR组(2分,49例)。高SII组、高COP-NLR组TNM分期Ⅳa期、淋巴结转移、颅底侵犯比例高于低SII组、低COP-NLR组(P<0.05)。高SII组、高COP-NLR组的5年OS明显降低(P<0.05)。TNM分期Ⅳa期、SII升高、COP-NLR评分升高是局部晚期鼻咽癌患者预后不良的危险因素(P<0.05)。结论:局部晚期鼻咽癌患者高SII、高COP-NLR评分与恶性病理特征和低生存率有关,SII、COP-NLR评分可作为局部晚期鼻咽癌预后预测的潜在生物学标志物。  相似文献   

9.
摘要 目的:研究结直肠癌(CRC)组织前梯度蛋白2(AGR2)、微纤维相关蛋白2(MFAP2)蛋白表达与临床病理特征和预后的关系。方法:将我院从2015年1月~2016年2月收治的84例CRC患者纳入研究。分别采集所有患者的CRC组织以及癌旁正常组织(距离肿瘤边缘2~5 cm),检测并比较不同组织中AGR2、MFAP2蛋白表达情况。分析AGR2、MFAP2蛋白表达与CRC患者临床病理特征以及预后的关系。采用Cox回归模型分析CRC患者预后的影响因素。结果:CRC组织中AGR2、MFAP2蛋白阳性表达率均高于癌旁正常组织(P<0.05)。分化程度为低分化、TNM分期为Ⅲ期及脉管浸润的CRC患者的AGR2、MFAP2蛋白阳性表达率均高于分化程度为中高分化、TNM分期为Ⅰ~Ⅱ期、无脉管浸润的CRC患者(P<0.05)。AGR2、MFAP2蛋白阳性表达患者的3年生存率及5年生存率均明显低于阴性表达患者(P<0.05)。经Cox回归模型分析发现:分化程度为低分化、TNM分期为Ⅲ期、脉管浸润以及AGR2、MFAP2蛋白阳性表达均是CRC患者死亡的危险因素(P<0.05)。结论:CRC组织中AGR2、MFAP2蛋白阳性表达率升高,且和患者分化程度、TNM分期、脉管浸润有关,检测其表达情况有助于预测CRC患者预后。  相似文献   

10.
摘要 目的:探讨结直肠癌组织Rab鸟嘌呤核苷酸交换因子-5(RABEX-5)、人源长寿保障基因2(LASS2)、同源异型盒基因B7(HOXB7)表达与临床病理特征及预后的关系。方法:选择2013年10月至2015年4月期间在我院接受治疗的105例结直肠癌患者作为研究对象。检测其结直肠癌组织以及癌旁组织中RABEX-5、LASS2、HOXB7表达,分析RABEX-5、LASS2、HOXB7表达与临床病理特征的关系,采用Kaplan-Meier生存曲线分析不同RABEX-5、LASS2、HOXB7表达患者总生存率的差异,Cox比例风险回归分析结直肠癌患者预后的影响因素。结果:与癌旁组织相比,结直肠癌组织中RABEX-5、HOXB7表达阳性率上调,而LASS2阳性率下降(P<0.05)。LASS2表达与TNM分期、浸润深度和淋巴结转移有关(P<0.05),而RABEX-5、HOXB7表达与TNM分期和淋巴结转移有关(P<0.05)。RABEX-5、HOXB7表达阳性患者的生存率分别低于RABEX-5、HOXB7表达阴性患者,而LASS2表达阳性患者的生存率高于LASS2表达阴性患者(P<0.05)。结直肠癌患者预后的影响因素包括TNM分期Ⅲ期、有淋巴结转移、RABEX-5阳性表达、LASS2阴性表达和HOXB7阳性表达(P<0.05)。结论:在结直肠癌组织中RABEX-5、HOXB7阳性率升高,而LASS2阳性率下降,且与TNM分期以及淋巴结转移密切相关。RABEX-5、LASS2、HOXB7表达与结直肠癌患者的生存和预后联系密切。  相似文献   

11.
12.
13.
The effects of the natural compound 2-methoxy-1,4-naphthoquinone, isolated from the leaves of Impatiens glandulifera and the synthetic compounds 2-propoxy-1,4-naphthoquinone and 2-isopropoxy-1,4-naphthoquinone on ecdysone 20-monooxygenase (E-20-M) activity were examined in three insect species. Homogenates of wandering stage third instar larvae of Drosophila melanogaster, or abdomens from adult female Aedes aegypti, or fat body or midgut from fifth instar larvae of Manduca sexta were incubated with radiolabelled ecdysone and increasing concentrations (from 1 x 10(-8) to 1 x 10(-3) M) of the three compounds. All three compounds were found to inhibit in a dose-dependent fashion the E-20-M activity in the three insect species. The concentration of these compounds required to elicit a 50% inhibition of this steroid hydroxylase activity in the three insect species examined ranged from approximately 3 x 10(-5) to 7 x 10(-4) M.  相似文献   

14.
目的:通过研究COX-2、PGE2、EP2受体及小胶质细胞在甲基苯丙胺中毒大鼠纹状体内的表达变化探讨甲基苯丙胺中毒大鼠纹状体中COX-2/PGE2系统与小胶质细胞活化之间的关系。方法:将40只健康成年雄性SD大鼠,随机分成对照组10只和实验组30只(实验组分成三个亚组,分为末次给药后1天组、2天组和3天组,n=10)。实验组给予10mg/kg的MA腹腔注射,对照组给予同样剂量的生理盐水,每天注射两次,注射时间为8:00、20:00,连续注射4天。分别于末次给药后的第1天、第2天、第3天处杀。用免疫组化技术对中毒大鼠纹状体(CPU)中COX-2、EP2受体及Iba1(钙离子接头蛋白,小胶质细胞内一种特异性标记物)的表达进行检测,并进行图像分析。另外,取大鼠的纹状体运用酶联免疫法检测PGE2的含量。结果:COX-2、PGE2、EP2受体及小胶质细胞在各组均有表达。与对照组相比,实验组中:COX-2、PGE2、EP2受体的1天组表达均不同程度下降;2天组中COX-2表达水平大幅度上升,PGE2、EP2受体表达仍低于正常水平;3天组COX-2表达水平继续升高,而PGE2、EP2受体表达趋于正常组水平。而小胶质细胞表达水平则是三个实验组均高于正常组,且3天组高于2天组,2天组高于1天组。对照组与实验组有显著性差异(P<0.05)。结论:COX-2/PGE2系统与甲基苯丙胺中毒大鼠纹状体内小胶质细胞活化无明显相关性;COX-2与甲基苯丙胺的神经毒性有关。  相似文献   

15.
Abstract Pseudomonas putida strain CLB 250 (DSM 5232) utilized 2-bromo-, 2-chloro- and 2-fluorobenzoate as sole source of carbon and energy. Degradation is suggested to be initiated by a dioxygenase liberating halide in the first catabolic step. After decarboxylation and rearomatization catechol is produced as a central metabolite which is degraded via the ortho-pathway. After inhibition of ring cleavage activities with 3-chlorocatechol, 2-chlorobenzoate was transformed to catechol in nearly stoichiometric amounts. Other ortho -substituted benzoates like anthranilate and 2-methoxybenzoate seem to be metabolized via the same route.  相似文献   

16.
SRC homology 2 (SH2)-containing inositol 5′-phosphatase protein (SHIP2) is a potential target for type 2 diabetes. Its ability to dephosphorylate the lipid messenger phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P3], important for insulin signaling, makes it an important target against type 2 diabetes. The insulin-induced SHIP2 interaction with Shc is very important for the membrane localization and functioning of SHIP2. There is a bidentate relationship between the two proteins where two domains each from SHIP2 and Shc are involved in mutual binding. However in the present study, the SHIP2-SH2 domain binding with the phosphorylated tyrosine 317 on the collagen-homology (CH) domain of Shc, has been studied due to the indispensability of this interaction in SHIP2 localization. In the absence of the crystal structure of SHIP2-SH2, its structural model was developed followed by tracking its molecular interactions with Shc through molecular docking and dynamics studies. This study revealed much about the structural interactions between the SHIP2-SH2 and Shc-CH. Finally, docking study of a nonpeptide inhibitor into the SHIP2-SH2 domain further confirmed the structural interactions involved in ligand binding and also proposed the inhibitor as a major starting point against SHIP2-SH2 inhibition. The insights gained from the current study should prove useful in the design of more potent inhibitors against type 2 diabetes.  相似文献   

17.
Recently, we identified WISP-2 (Wnt-1 inducible signaling pathway protein 2) as a novel estrogen-inducible gene in the MCF-7 human breast cancer cell line. In this study, we examined whether WISP-2 expression is modulated by PK activators. Treatment with protein kinase A (PKA) activators [cholera toxin plus 3-isobutyl-1-methylxanthine (CT/IBMX)] induced WISP-2 expression. CT/IBMX induced expression of the other estrogen-responsive gene, pS2, more dramatically than maximum stimulation by 17beta-estradiol (E2). Treatment with 12-O-tetradecanoylphorbol-13-acetate (TPA), which directly stimulates protein kinase C (PKC) activity, completely prevented WISP-2 mRNA induction by E2, whereas it increased pS2 mRNA expression more dramatically than maximum stimulation by E2. Results of treatments with the protein synthesis inhibitor cycloheximide and the pure antiestrogen ICI182,780 suggest that these PK pathways modulate WISP-2 gene expression via different molecular mechanisms than those for pS2. Because TPA inhibits cell proliferation, we investigated whether WISP-2 induction was dependent on cell growth. Cells were treated with insulin-like growth factor-1 (IGF-1) or interleukin-1alpha (IL-1alpha) to stimulate or inhibit cell growth, respectively. These treatments had no effect on WISP-2 mRNA expression either alone or in combination with E2, suggesting that WISP-2 induction is independent of cell growth.  相似文献   

18.
The protein kinase CK2 (former name: "casein kinase 2") predominantly occurs as a heterotetrameric holoenzyme composed of two catalytic chains (CK2alpha) and two noncatalytic subunits (CK2beta). The CK2beta subunits form a stable dimer to which the CK2alpha monomers are attached independently. In contrast to the cyclins in the case of the cyclin-dependent kinases CK2beta is no on-switch of CK2alpha; rather the formation of the CK2 holoenzyme is accompanied with an overall change of the enzyme's profile including a modulation of the substrate specificity, an increase of the thermostability, and an allocation of docking sites for membranes and other proteins. In this study we used C-terminal deletion variants of human CK2alpha and CK2beta that were enzymologically fully competent and in particular able to form a heterotetrameric holoenzyme. With differential scanning calorimetry (DSC) we confirmed the strong thermostabilization effect of CK2alpha on CK2beta with an upshift of the CK2alpha melting temperature of more than 9 degrees . Using isothermal titration calorimetry (ITC) we measured a dissociation constant of 12.6 nM. This high affinity between CK2alpha and CK2beta is mainly caused by enthalpic rather than entropic contributions. Finally, we determined a crystal structure of the CK2beta construct to 2.8 A resolution and revealed by structural comparisons with the CK2 holoenzyme structure that the CK2beta conformation is largely conserved upon association with CK2alpha, whereas the latter undergoes significant structural adaptations of its backbone.  相似文献   

19.
The K+, Na+/H+ antiporter LeNHX2 and the regulatory kinase SlSOS2 are important determinants of salt tolerance in tomato plants and their fruit production ability. In this work, we have analyzed the effects of LeNHX2 and SlSOS2 co-overexpression on fruit production, quality in tomato plants (Solanum lycopersicum L. cv. MicroTom), and analyzed physiological parameters related to salt tolerance. Plants overexpressing LeNHX2, SlSOS2 or both were grown in greenhouse. They were treated with 125 mM NaCl or left untreated and their salt tolerance was analyzed in terms of plant biomass and fruit yield. Under NaCl cultivation conditions, transgenic tomato plants overexpressing either SlSOS2 or LeNHX2 or both grew better and showed a higher biomass compared to their wild-type plants. Proline, glucose and protein content in leaves as well as pH and total soluble solid (TSS) in fruits were analyzed. Our results indicate that salinity tolerance of transgenic lines is associated with an increased proline, glucose and protein content in leaves of plants grown either with or without NaCl. Salt treatment significantly reduced yield, pH and TSS in fruits of WT plants but increased yield, pH and TSS in fruits of transgenic plants, especially those overexpressing both LeNHX2 and SlSOS2. All these results indicate that the co-overexpression of LeNHX2 and SlSOS2 improve yield and fruit quality of tomato grown under saline conditions.  相似文献   

20.
The distribution of enduracididine, 2-[2-amino-2-imidazolin-4-yl] acetic acid, 2-aminoimidazole, canavanine, homoarginine, γ-hydroxyhomoarginine and other unidentified guanidino compounds in seeds of spp. of the Tephrosieae is described. Within Lonchocarpus enduracididine and 2-[2-amino-2-imidazolin-4-yl] acetic acid were found only in American spp. and canavanine only in African spp.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号