Structure and Function of ε-Subunit of ATP Synthase in Higher Plant Chloroplast

The ε-subunit is the smallest subunit of chloroplast ATP synthase, and is known to inhibit ATPase activity in isolated CF1-ATPase. As a result ε is sometimes called an inhibitory subunit. In addition, and perhaps more importantly, the ε -subunit is essential for the coupling of proton translocation to ATP synthesis (as proton gate). The relation between the structure and function of ε -subunit of ATP synthase in higher plant chloroplast has been studied by molecular biological methods such as site-directed mu-tagenesis and truncations for C- or N-terminus of ε -subunit. The results showed that: (1) Thr42 of ε-subunit is important for its structure and function; (2) compared with the ε-subunit in E.coli, the ε-subunit of chloroplast ATP synthase is more sensitive to C- or N-terminus truncations.

ATP Synthase β-subunit Abnormality in Pancreas Islets of Rats with Polycystic Ovary Syndrome and Type 2 Diabetes Mellitus

This study investigated the abnormal expression of ATP synthase β-subunit（ATPsyn-β） in pancreas islets of rat model of polycystic ovary syndrome（PCOS） with type 2 diabetes mellitus（T2DM）,and the secretion function changes after up-regulation of ATP5 b.Sixty female SD rats were divided into three groups randomly and equally.The rat model of PCOS with T2 DM was established by free access to the high-carbohydrate/high-fat diet,subcutaneous injections of DHEA,and a single injection of streptozotocin.The pancreas was removed for the detection of the ATPsyn-β expression by immunohistochemical staining,Western blotting and reverse transcription-PCR（RT-PCR）.The pancreas islets of the rats were cultured,isolated with collagenase Ⅴ and purified by gradient centrifugation,and the insulin secretion after treatment with different glucose concentrations was tested.Lentivirus ATP5 b was successfully constructed with the vector of GV208 and transfected into the pancreas islets for the over-expression of ATPsyn-β.The insulin secretion and intracellular ATP content were determined after transfection of the PCOS-T2 DM pancreas islets with Lenti-ATP5 b.The results showed that the expression of ATPsyn-β protein and m RNA was significantly decreased in the pancreas of PCOS-T2 DM rats.The ATP content in the pancreas islets was greatly increased and the insulin secretion was improved after the up-regulation of ATPsyn-β in the pancreas islets transfected with lenti-ATP5 b.These results indicated that for PCOS,the ATPsyn-β might be one of the key factors for the attack of T2 DM.

Correlation between the expressions of metastasis-associated factor-1 in colon cancer and vacuolar ATP synthase

BACKGROUND Clinical prognosis often worsens due to high recurrence rates following radical surgery for colon cancer.The examination of high-risk recurrence factors post-surgery provides critical insights for disease evaluation and treatment planning.AIM To explore the relationship between metastasis-associated factor-1 in colon cancer(MACC1)and vacuolar ATP synthase(V-ATPase)expression in colon cancer tissues,and recurrence rate in patients undergoing radical colon cancer surgery.METHODS We selected 104 patients treated with radical colon cancer surgery at our hospital from January 2018 to June 2021.Immunohistochemical staining was utilized to assess the expression levels of MACC1 and V-ATPase in these patients.RESULTS The rates of MACC1 and V-ATPase positivity were 64.42%and 67.31%,respe-ctively,in colon cancer tissues,which were significantly higher than in paracan-cerous tissues(P<0.05).Among patients with TNM stage III,medium to low differentiation,and lymph node metastasis,the positive rates of MACC1 and V-ATPase were significantly elevated in comparison to patients with TNM stage I-II,high differentiation,and no lymph node metastasis(P<0.05).The rate of MACC1 positivity was 76.67%in patients with tumor diameters>5 cm,notably higher than in patients with tumor diameters≤5 cm(P<0.05).We observed a positive correlation between MACC1 and V-ATPase expression(rs=0.797,P<0.05).The positive rates of MACC1 and V-ATPase were significantly higher in patients with recurrence compared to those without(P<0.05).Logistic regression analysis revealed TNM stage,lymph node metastasis,MACC1 expression,and V-ATPase expression as risk factors for postoperative colon cancer recurrence(OR=6.322,3.435,2.683,and 2.421;P<0.05).CONCLUSION The upregulated expression of MACC1 and V-ATPase in colon cancer patients appears to correlate with clinicopathological features and post-radical surgery recurrence.

Numerical study of the coupling between F0 with varied numbers of c-subunits and F1 in an ATP synthase

ATP synthase is a rotary motor which is composed of two portions： the ‘rotor＇ Fo, consisting of a c-ring, and the ‘stator＇ F1, consisting of an a3/33 hexamer. In different species, the number of c-subunits which form the c-ring is varied from 10 to 14, whereas the a3/33 hexamer is fixed to be 3-fold symmetrical. We have numerically studied the rotational coupling between Fo with varied number of c-subunits and F1. It is found that, for any number of c-subunits, the rotor Fo advances 3 steps per revolution on average, which is determined by the period of F1, whereas the exact angular pausing positions are determined by the period of Fo. When the symmetry of the c-ring of Fo is matched with the 3-fold symmetry of F1, the three steps have equivalent sizes. If not matched, the three steps become nonequivalent： both the step size and average dwell time are different for these steps.

CHCHD2 Thr61Ile mutation impairs F1F0-ATPase assembly in in vitro and in vivo models of Parkinson's disease

Mitochondrial dysfunction is a significant pathological alte ration that occurs in Parkinson's disease(PD),and the Thr61lle(T61I)mutation in coiled-coil helix coiled-coil helix domain containing 2(CHCHD2),a crucial mitochondrial protein,has been reported to cause Parkinson's disease.FIFO-ATPase participates in the synthesis of cellular adenosine triphosphate(ATP)and plays a central role in mitochondrial energy metabolism.However,the specific roles of wild-type(WT)CHCHD2 and T611-mutant CHCHD2 in regulating F1FO-ATPase activity in Parkinson's disease,as well as whether CHCHD2 or CHCHD2 T61I affects mitochondrial function through regulating F1FO-ATPase activity,remain unclea r.Therefore,in this study,we expressed WT CHCHD2 and T61l-mutant CHCHD2 in an MPP^(+)-induced SH-SY5Y cell model of PD.We found that CHCHD2 protected mitochondria from developing MPP^(+)-induced dysfunction.Under normal conditions,ove rexpression of WT CHCHD2 promoted F1FO-ATPase assembly,while T61I-mutant CHCHD2 appeared to have lost the ability to regulate F1FO-ATPase assembly.In addition,mass spectrometry and immunoprecipitation showed that there was an interaction between CHCHD2 and F1FO-ATPase.Three weeks after transfection with AAV-CHCHD2 T61I,we intraperitoneally injected 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine into mice to establish an animal model of chronic Parkinson's disease and found that exogenous expression of the mutant protein worsened the behavioral deficits and dopaminergic neurodegeneration seen in this model.These findings suggest that WT CHCHD2 can alleviate mitochondrial dysfunction in PD by maintaining F1F0-ATPase structure and function.

Decaprenyl diphosphate synthase subunit 2 as a prognosis factor in hepatocellular carcinoma

AIM:To investigate the involvement of decaprenyl diphosphate synthase subunit 2(PDSS2) in development and progression of human hepatocellular carcinoma(HCC).METHODS:PDSS2 protein expression was examined in well-and poorly differentiated HCC tumor samples.The levels of PDSS2 expression were compared with clinical features and prognosis of HCC patients.The effects of PDSS2 on cell proliferation,cell cycle,apoptosis,cell migration,and invasion in HCC Hep G2 cells were also investigated.RESULTS:PDSS2 was downregulated in poorly differentiated cancer samples compared with welldifferentiated tumor samples,and the expression level was markedly lower in HCC tissues than in histologically normal tissue adjacent to the cancer.Reduced protein expression was negatively associated with the status of HCC progression.In addition,overexpression of PDSS2dramatically suppressed cell proliferation and colony formation,and induced apoptosis in Hep G2 cells by inducing G1-phase cell-cycle arrest.The migration and invasion capabilities of Hep G2 cells were significantly decreased following PDSS2 overexpression.CONCLUSION:Decreased PDSS2 expression is an unfavorable prognostic factor for HCC,and PDSS2 has potent anticancer activity in HCC tissues and Hep G2cells.

ATP合酶亚基d参与海藻糖代谢调控棉铃虫幼虫变态的分子机理

【目的】本研究旨在解析ATP合酶亚基d(ATP synthase subunit d, ATPs-d)参与海藻糖代谢调控棉铃虫Helicoverpa armigera幼虫发育和变态中的功能及分子机理。【方法】PCR扩增棉铃虫HaATPs-d的开放阅读框,并利用生物信息学方法对其序列及系统发育进行分析;利用qRT-PCR检测HaATPs-d在5龄蜕皮期幼虫和6龄幼虫表皮、中肠和脂肪体中及对20-羟基蜕皮酮(20-hydroxyecdysone, 20E)(0.1 mg/mL)响应的6龄幼虫脂肪体和表皮中的表达量;利用荧光拍照分析HaATPs-d在草地贪夜蛾Spodoptera frugiperda卵巢细胞系Sf9细胞中的亚细胞定位;采用酵母双杂交分析与HaATPs-d互作的蛋白;对棉铃虫6龄幼虫注射dsHaATPs-d,分析RNAi降低HaATPs-d的表达量对幼虫发育及变态和中肠中可溶性海藻糖酶活性和海藻糖含量的影响。【结果】棉铃虫HaATPs-d(GenBank登录号:LOC110375576)的开放阅读框长525 bp,编码174个氨基酸并具有较高的保守性,与草地贪夜蛾和斜纹夜蛾S.litura中的ATPs-d亲缘关系较近。HaATPs-d的表达高峰出现在6龄第3天幼虫表皮中,在中肠和肪体中的表达量均以在5龄蜕皮期幼虫中的最高。与对照相比,20E(0.1 mg/mL)显著上调6龄幼虫脂肪体和表皮中HaATPs-d的表达量。HaATPs-d是细胞质蛋白。与注射dsGFP对照组比较,HaATPs-d与棉铃虫可溶性海藻糖酶直接结合。棉铃虫6龄幼虫中敲低HaATPs-d的表达量导致幼虫发育迟缓,幼虫体重下降,幼虫死亡率升高,化蛹率和成虫羽化率降低,中肠中可溶性海藻糖酶活性显著下降和海藻糖含量显著上升。【结论】HaATPs-d通过与棉铃虫可溶性海藻糖酶的直接结合控制幼虫体内可溶性海藻糖酶性和海藻糖含量,进而影响幼虫变态中的糖源,最终控制幼虫的变态。

ATP酶抑制因子1对脂多糖诱导的小鼠肺泡巨噬细胞炎症反应及线粒体自噬的影响

目的:本研究旨在探索ATP酶抑制因子1(ATPase inhibitory factor 1,IF1)在脂多糖(lipopolysaccha⁃ride,LPS)诱导的肺泡巨噬细胞炎症模型中的作用。方法:用LPS刺激小鼠肺泡巨噬细胞系MH-S作为体外细胞炎症模型。利用CRISRP activation质粒构建过表达IF1的MH-S细胞系,采用Western blot及RT⁃qPCR检测IF1的表达;ELISA法检测细胞炎症因子白细胞介素6(interleukin-6,IL-6)、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)和IL-1β水平;JC-1和MitoSOX™Red分别检测细胞线粒体膜电位(mitochondrial membrane potential,MMP)和活性氧(reactive oxygen species,ROS)水平;Western blot检测自噬相关蛋白LC3、线粒体膜蛋白TOM20和线粒体自噬蛋白parkin水平;荧光共定位检测线粒体的标记探针MitoTracker Red与自噬相关蛋白LC3的共定位情况。结果:LPS刺激肺泡巨噬细胞后IF1表达水平降低,细胞炎症因子分泌增加(P<0.01),MMP下降,ROS水平升高、LC3-II/LC3-I比值与parkin蛋白水平升高,TOM20蛋白水平下降(P<0.01),Mito-Tracker Red与LC3蛋白共定位增加。上调IF1后,过表达组中IF1表达水平升高,细胞炎症因子分泌也相应减少,MMP和ROS水平恢复,LC3-II/LC3-I比值与parkin蛋白水平下降,TOM20蛋白水平升高,MitoTracker Red与LC3蛋白共定位减少。结论:IF1可能通过抑制肺泡巨噬细胞线粒体自噬并改善线粒体功能,从而减轻巨噬细胞炎症因子的分泌。

Construction of eukaryotic expression vector encoding ATP synthase lipid-binding protein-like protein gene of Sj and its expression in HeLa cells

Objective： To clone and construct the recombinant plasmid containing ATP synthase lipid-binding protein-like protein gene of Schistosomajaponicum,（SjAslp） and transfer it into mammalian cells to express the objective protein. Methods： By polymerase chain reaction （PCR） technique, SjAslp was amplified from the constructed recombinant plasmid pBCSK＋/SjAslp, and inserted into cloning vector pUCm-T. Then, SjAslp was subcloned into an eukaryotic expression vector pcDNA3.1（＋）. After identifying it by PCR, restrictive enzymes digestion and DNA sequencing, the recombinant plasmid was transfected into HeLa cells using electroporation, and the expression of the recombinant protein was analyzed by immunocytochemical assay. Results： The specific gene fragment of 558 bp was successfully amplified. The DNA vaccine of SjAslp was successfully constructed. Immunocytochemical assay showed that SjAslp was expressed in the cytoplasm of HeLa cells. Conclusion： SjAslp gene can be expressed in eukaryotic system, which lays the foundation for development of the SjAslp DNA vaccine against schitosomiasis.

CLONING,SEQUENCING AND DETERMINATION OF THE GENE FRAGMENT OF α-CHAIN OF ATP SYNTHASE IN DUNALIELLA BARDAWIL

Halophilic alga Dunaliella bardawil (Chlorophyceae) was cultivated in artificialseawater (containing 3 .0, 1. 5 or 0. 5 mol/L of NaCl respectively) for at least two weeks; total RNAswere then extracted and 8 stable differential bands were harvested after DDRT-PCR and electrophoresis.The retrieved bands were amplified, subjected to electrophoresis again, and cloned into plasmid pUCm-Trespectively. After exelusion of false positive bands, We obtained a recombinant plasmid pTE containing afragment of cDNA, which was only specilically expressed under high salinity condition. Sequencing of

ATP合酶亚基α在棉铃虫幼虫变态中的功能机理分析

【目的】本研究旨在解析ATP合酶亚基α(ATP synthase subunit α, ATPs-α)在棉铃虫Helicoverpa armigera变态和发育中的功能机理。【方法】PCR扩增棉铃虫ATPs-α基因开放阅读框,并进行生物信息学分析;利用qRT-PCR检测HaATPs-α在棉铃虫5龄蜕皮期和6龄第1-5天幼虫表皮、中肠和脂肪体中及外源20-羟蜕皮酮(20-hydroxyecdysone, 20E)(0.1 mg/mL)处理后6龄幼虫表皮和脂肪体中的表达量;对棉铃虫6龄幼虫注射dsHaATPs-α,分析RNAi降低HaATPs-α的表达量对幼虫发育及变态及其体内ATP含量、海藻糖和葡萄糖含量以及海藻糖酶活性的影响。【结果】棉铃虫HaATPs-α的开放阅读框长1 677 bp,棉铃虫、草地贪夜蛾Spodoptera frugiperda、斜纹夜蛾S.litura和粉纹夜蛾Trichoplusia ni这4种鳞翅目(Lepidoptera)夜蛾科(Noctuidae)昆虫的ATPs-α氨基酸序列一致性为96.56%,且亲缘关系较近。表达模式分析结果显示,HaATPs-α在6龄第3天幼虫表皮和中肠中表达量最高,在5龄蜕皮期脂肪体中出现表达高峰;20E(0.1 mg/mL)处理较对照显著上调6龄幼虫中HaATPs-α的表达量。与对照组(注射dsGFP)相比,利用RNAi敲低HaATPs-α表达量后,幼虫发育迟缓,幼虫体重显著下降,幼虫死亡率显著升高,化蛹率和成虫羽化率显著降低,ATP含量和海藻糖酶活性均显著降低,海藻糖含量显著升高,葡萄糖含量显著降低。【结论】HaATPs-α不仅控制棉铃虫ATP的产量,同时还影响着海藻糖和葡萄糖的含量,因此,HaATPs-α在幼虫变态中发挥着重要作用。本研究结果还可为将来利用ATPs-α作为有害生物防控的新靶标提供实验证据和理论依据。

Non-Thermal Radio Frequency Stimulation Inhibits the Tryptophan Synthase Beta Subunit in the Algae <i>Chlamydomonas reinhardtii</i>

To demonstrate the ability of the Nativis signal transduction technology (Butters et al. 2014) to modulate the expression of algae mRNA and protein, we tested if we can alter specific enzyme levels in Chlamydomonas reinhardtii. We inhibited the synthesis of the enzyme tryptophan synthase beta subunit (MAA7) by applying the signal derived from a published siRNA (Zhao et al. 2009). With lower levels of MAA7, Chlamydomonas reinhardtii can grow in the presence of the prodrug 5-Fluoroindole (5-FI), because less 5-Fluoroin-dole can be converted to the toxic 5-Fluoro-L-tryptophan (5-FT). We find a 24% (&plusmn;5%) increase of growth with the signal versus no signal. To see if that effect was due to the reduction of the amount of mRNA encoding MAA7, we used Real-Time Quantitative PCR (RT-QPCR) to measure the levels of MAA7 mRNA. To normalize the MAA7 mRNA level, we compared them to the levels of a mRNA that is not affected by the signal (G protein beta subunit-like polypeptide, Cblp). Two conditions increase the effectiveness of the signal. One can either treat the cell cultures during the logarithmic growth phase (starting the cultures at density of 0.104 OD at 750 nm). Or one can treat the cultures at a later stage of the logarithmic growth, but treating them for a longer time (8.7% versus 3.5% of the culture time). Under these conditions we found around a 50% decrease in the mRNA levels for MAA7. Treating the cultures at the earlier growth phase or at a later growth phase is less effective, with only a 20% effect.

Expression of ATP synthase 6 in breast cancer cell line, T47D cells, induced by heregulin β1

目的 :探讨 Heregulinβ1诱导乳腺癌细胞 T47D相关基因的表达。方法 :应用差减杂交和斑点杂交技术检测乳腺癌细胞在 Heregulinβ1 ( 30 μg· L-1)作用 1 8h后 ,相关基因的表达情况。结果 :线粒体 ATP合成酶 6m RNA的表达在 1～ 6h明显增高。结论 :乳腺癌细胞 T47D在 Here-gulinβ1刺激后 ,细胞 ATP酶

自然衰老棉花种子的生理变化及ATP合成酶亚基m RNA的完整性

【目的】种子衰老是一个复杂的生物学过程,以自然衰老的棉花种子为材料,研究种子自然储藏后的生理生化变化及种胚ATP合成酶亚基mRNA的完整性,为进一步揭示种子衰老机理提供依据。【方法】以自然储存3年、5年和新收获的新陆早74号棉花种子为试验材料(以新收获的棉种为对照(CK));分别采用纸间萌发试验、低温恒温干燥法和TTC染色法测定棉花种子的萌发率、吸水力和种子生活力;利用酸碱滴定法测定棉花种子的酸价和呼吸速率,采用植物ATP合成酶酶联免疫分析试剂盒测定种胚ATP合成酶活性,并利用反转录阻断-双引物扩增法分析棉花种胚ATP合成酶α、β、γ、ε和δ亚基mRNA的完整性。【结果】自然储藏会导致种子活力显著降低。与对照相比,自然储存3年和5年后,棉种萌发率由98.7%分别显著降低至84.0%和58.0%(P<0.05);种子吸胀初期(4 h内)吸水力分别比对照显著降低了11.0%和26.9%(P<0.05);TTC染色法检测结果显示种子生活力明显下降,其中,储藏5年的种子仅有胚根部位有少量着色,而子叶等器官未被染色;储藏3年和5年的种子酸价分别较对照显著升高了28.4%和40.0%,表明种子内脂肪类物质发生严重水解;吸胀期间种子呼吸速率和ATP合成酶活性表现出增加趋势(P<0.05),但增幅均显著下降;其中,吸胀24 h后呼吸速率增幅分别较对照降低了33.3%和49.2%,吸胀12 h后ATP合成酶活性增幅则分别较对照降低了17.9%和73.4%;反转录阻断-双引物扩增法分析结果显示,ATP合成酶的α亚基、β亚基、γ亚基和δ亚基mRNA的R值均显著低于对照,而ε亚基mRNA的R值则显著高于对照(P<0.05),说明这5种亚基的mRNA在自然储藏过程中出现不同程度的降解。【结论】延长贮藏时间,将导致棉花种子活力下降;种胚中ATP合成酶亚基mRNA完整性丧失,导致ATP合成酶亚基受损,ATP合成酶活性下降,进而造成ATP合成减少,影响种子萌发能力。这可能是棉花种子衰老的重要原因之一。

线粒体ATP合酶抑制因子1在肿瘤中作用的研究进展

线粒体ATP合酶抑制因子1(IF1)是ATP合酶的生理性抑制因子,可与ATP合酶结合,改变线粒体的多个功能指标,如ATP水平、线粒体膜电位、线粒体活性氧(ROS)等。多年来不断有研究发现IF1在肿瘤组织中高表达,并参与肿瘤的形成、进展及转移过程。目前的主要作用包括抑制ATP合酶活性;激活ROS介导的增殖反应;改善线粒体嵴结构及抑制细胞凋亡。同时IF1的表达与肿瘤的预后相关。文章就IF1在肿瘤的作用机制以及与线粒体ATP合酶、mtROS、线粒体结构的关系进行系统综述,希望能为治疗肿瘤提出新的突破口。

Ectopic ATP synthase in endothelial cells:a novel cardiovascular therapeutic target

ATP synthase(ATPS) produces ATP in cells and is found on the inner membrane of mitochondria or the cell plasma membrane.In this presentation, we will briefly summarize the functions of ecto-ATPS in vascular endothelial cells(ECs).Ecto -ATPS is involved in adenosine metabolism on the cell surface through its ATP generation or hydrolysis activity.The ATP/ADP generated by the enzyme on the plasma membrane can bind to P2X/P2Y receptors and activate the related signaling pathways to regulate endothelial function.The-chain of ectopic ATP synthase(ATPS) on the EC surface can recruit inflammatory cells and activate cytotoxic activity to damage ECs and induce vascular inflammation.Angiostatin and other angiogenesis inhibitors can have anti-angiogenic functions by inhibiting ecto-ATPS on ECs.Ecto-ATPS on ECs is also a receptor for apoA-Ⅰ, the acceptor of cholesterol efflux,which implies the involvement in cholesterol metabolism.The main talk will focus on our recent study about shear stress regulated membrane translocation of ATPS in ECs and the consequent interaction with T lymphocytes, which caused endothelial activation.We found that laminar flow decreased level of membrane-bound ATPS(ecto-ATPS) and depleted membrane cholesterol level in ECs.In contract,oscillatory flow increased endothelial ecto-ATPS? and membrane cholesterol levels.Incubating ECs with cholesterol or depleting cellular cholesterol could mimic the effect of oscillatory or laminar flow,respectively.Knockdown of caveolin-1 expression by siRNA prevented ATPS translocation in response to shear stress.Importantly, oscillatory flow elevated the number of T cells binding to ECs,and effect that could be blocked by anti-ATPS antibody;laminar flow significantly decreased this attachment.Furthermore,the interaction of T cells and ATPS membrane translocation was elevated in the inner curvature of the aortic arch of apoE-/- mice fed a high-fat diet. Thus,our study provided the first evidence that disturbed flow and hypercholesterolemia synergistically promote T-lymphocyte activation through the membrane translocation of ATPS in ECs.Through these functions,ecto-ATPS on ECs is considered a potential and novel therapeutic target for atherosclerosis, hypertension and lipid disorders.

抗人F1-F0 ATP合成酶beta亚基单抗的制备及其抗肿瘤活性研究

目的:制备鼠抗人F1-F0ATP合成酶beta亚基(hATP5B)单抗,并对其特异性和抗肿瘤活性进行研究。方法:以原核表达人hATP5B免疫BALB/c小鼠,通过杂交瘤技术,筛选分泌抗hATP5B单抗的杂交瘤细胞株。采用Protein A亲和层析法纯化抗体腹水,SDS-PAGE检测纯化产物纯度。利用Western blot、细胞免疫荧光对其特异性进行鉴定,并通过抑制乳腺癌细胞MCF-7及其耐药株MCF-7/Adr表面ATP生成,细胞毒性实验进行抗肿瘤活性研究。结果:获得一株稳定表达抗hATP5B单抗的杂交瘤细胞株Mab3B8,Western blot和细胞免疫荧光结果表明,该抗体与乳腺癌MCF-7及其耐药细胞MCF-7/Adr细胞天然抗原结合;可明显抑制MCF-7及其耐药株MCF-7/Adr细胞膜表面ATP合成;与化疗药物多柔比星(曾用名:阿霉素)联合作用,可降低化疗药物多柔比星对肿瘤细胞的IC50。结论:成功建立了一株可特异性识别天然hATP5B的单抗,有阻断肿瘤细胞膜表面ATP合成活性并可明显增强MCF-7及其耐药株MCF-7/Adr细胞对多柔比星敏感性的作用。此项研究对膜表达F1-F0ATP合成酶功能探讨及肿瘤治疗研究都具有重要意义。

亚洲黑熊四川亚种(Ursus thibetanus mupinensis)线粒体ATP合酶和亚基基因克隆及序列分析

根据已报道的部分哺乳动物线粒体ATP合酶F0亚基的相关信息设计引物,运用PCR技术,首次从亚洲黑熊四川亚种(Ursus thibetanus mupinensis)的肌肉组织总DNA中成功克隆了线粒体ATP合酶F0亚基8(ATP8)和亚基6(ATP6)的序列,并对其进行了初步分析。结果表明:PCR扩增产物的总长度为942 bp,其中842 bp为四川黑熊ATP8和ATP6基因的编码区。ATP8和ATP6基因存在一段长43 bp的重叠区域。ATP8基因长204 bp,编码67个氨基酸残基的蛋白质,其蛋白分子质量为7.9 KD,等电点为10.35;ATP6基因长682 bp,编码226个氨基酸残基的蛋白质,其蛋白分子质量为24.8 KD,等电点为10.63。四川黑熊线粒体ATP合酶F0亚基8和亚基6与其他已报道的部分哺乳动物具有很高的同源性。以基因序列为数据构建的进化树表明四川黑熊和美洲黑熊的亲缘关系最近。本研究为在分子水平上探究黑熊线粒体基因组的遗传特点,探究物种进化关系和物种多样性提供了科学参考。

水稻叶绿体 ATP合成酶基因转录丰度受赤霉素诱导调节

采用 m RNA差异显示技术分离和鉴定了水稻受赤霉素诱导的差异表达基因。经 5 0个引物组合差异显示 ,获得 2 1个诱导表达差异的 c DNA片段。经反向 Northern初步筛选对其中 5个阳性片段进行克隆及序列分析。其序列经国际联网BLAST查询表明编号为 GA2 1C的为水稻叶绿体 ATP合成酶基因片段。Southern杂交结果证实此基因为单拷贝。Northern杂交结果显示确受赤霉素诱导表达且在诱导 16 h后达到高峰 。

暗纹东方鲀线粒体ATPase8和ATPase6基因的克隆与序列分析

克隆并测定了暗纹东方鲀(Takifugu fasciatus)线粒体ATP合酶Fo亚基8(ATPase8)和亚基6(ATPase6)的序列,并对其进行了初步分析。结果表明:PCR扩增产物的总长度为923 bp,其中842 bp为ATP8和ATP6基因的编码区。ATP8基因长168 bp,编码55个氨基酸残基的蛋白质,其蛋白分子质量为6.8 KD,等电点为7.85;ATP6基因长684 bp,编码227个氨基酸残基的蛋白质,其蛋白分子质量为24.9 KD,等电点为9.16。暗纹东方鲀ATP合酶Fo亚基8和亚基6与其他已报道的部分东方鲀属鱼类具有很高的同源性。通过探讨ATP合酶Fo亚基所含的信息量,发现相对于其他线粒体基因,ATPase8和ATPase6基因所含鉴别信息较少。