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端粒及端粒酶的研究现状 总被引:2,自引:0,他引:2
综述了端粒、端粒酶的结构、功能,以及端粒序列复制问题与端粒酶活性在细胞衰老和癌变中的重要作用。 相似文献
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Shu Yang JunFeng Xiang QianFan Yang QiuJu Zhou XiuFeng Zhang Qian Li YaLin Tang GuangZhi Xu 《科学通报(英文版)》2011,56(7):613-617
Over the past few decades, numerous molecules have been discovered or designed to interact efficiently and selectively with
a peculiar DNA structure named G-quadruplex. Some of these molecules have been developed as anticancer agents. To aid the
design of anticancer agents, the ability of alkaloids possessing Protoberberine and Benzophenanthridine groups to induce the formation of G-quadruplexes were studied using CD spectroscopy. By careful examination of their structures,
we found that a benzo[1,3]dioxole group plays an important role in influencing their inductive properties. The more functional
groups the alkaloids have, the stronger their G-quadruplex inductive ability. 相似文献
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人体端粒由富含鸟嘌呤(G)的DNA重复序列组成,该序列在一定的条件下可以形成G-四链体DNA的结构.小分子化合物诱导该结构的形成并使之稳定,不但可以抑制端粒酶的活性或降低癌基因的转录表达而达到抗肿瘤的目的,还可以作为G-四链体DNA的探针,辅助G-四链体DNA生物功能的研究及与之相关疾病的诊断.因此,G-四链体DNA稳定剂的设计是近年来化学生物学的重要前沿领域之一.到目前为止,G-四链体DNA稳定剂主要可分为有机小分子化合物和金属配合物.本文重点综述这两方面特别是后者的最新研究进展. 相似文献
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从热力学和动力学两个方面研究了旁侧序列对人端粒核心序列G3(T2AG3)3在钠离子溶液中所形成的Cr-quadruplex结构的影响.紫外吸收熔解实验表明G3(T2AG3)3一侧或两侧加上6个胸腺嘧啶核苷酸序列(T6)会明显降低G-quadruplex的相变温度(Tm).在3′端加上T6时Tm降低约5℃,在5′端加上T6时Tm降低约10℃,两侧同时加上T6时L降低16℃.采用表面等离子体共振(surface plasmon resonance,SPR)测定G-quadruplex折叠和去折叠动力学的结果表明旁侧序列的加入同时降低了折叠和去折叠的速率常数(kf,ku),使折叠平衡常数(KF)由9.01降至7.44.上述结果表明旁侧序列的存在降低了G-quadruplex结构的稳定性. 相似文献
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王宏斌 《中山大学研究生学刊(自然科学与医学版)》2001,22(1):41-43
本介绍了端粒,端粒酶的结构,功能,并较为详细地阐述了端粒-端粒酶假说及其实验证据以及端粒研究的应用前景。 相似文献
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A highly sensitive telomerase detection method that combines telomeric repeat amplification protocol (TRAP) and magnetic beads based electrochemiluminescence (ECL) assay has been developed. Briefly, telomerase recognizes biotinylated telomerase synthesis primer (B-TS) and synthesizes extension products, which then serve as the templates for PCR amplification using B-TS as the forward primer and tris-(2′2′-bipyridyl) ruthenium (TBR) labeled ACX (TBR-ACX) as the reversed primer. The amplified product is captured on streptavidin-coated paramagnetic beads and detected by ECL. Telomerase positive HeLa cells were used to validate the feasibility of the method. The experimental results showed down to 10 cancer cells can be detected easily. The method is a useful tool for telomerase activity analysis due to its sensitivity, rapidity, safety, high throughput, and low cost. It can be used for screening a large amount of clinical samples. 相似文献
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曲丽君 《辽宁师专学报(自然科学版)》1999,(2)
端粒酶是维持染色体长度及功能稳定的重要物质.研究表明,端粒、端粒酶与细胞寿命直接相关.通过对端粒酶的活性及在表达程度的研究进—步发现其与肿瘤的发生和转移具有十分密切的关系.人们正在研究将端粒酶的表达水平作为肿瘤诊断和愈后的指标,并可能将端粒酶抑制列为肿瘤治疗的新方法. 相似文献