Structure of a two-G-tetrad intramolecular G-quadruplex formed by a variant human telomeric sequence in K+ solution: insights into the interconversion of human telomeric G-quadruplex structures.

Structure of a two-G-tetrad intramolecular G-quadruplex formed by a variant human telomeric sequence in K+ solution: insights into the interconversion of human telomeric G-quadruplex structures.
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DOI:
10.1093/nar/gkp1029
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发表时间:
2010-01
影响因子:
14.9
通讯作者:
Yang D
Yang D
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang Z;Dai J;Veliath E;Jones RA;Yang D

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人端粒DNA G-四链体已被认为是一个有吸引力的癌症治疗干预的目标。端粒序列具有内在的结构多态性。在这里,我们报告了一种新的分子内G-四链体结构形成的变异人类端粒序列在K+溶液中。该序列形成篮式分子内G-四链体,只有两个G-四联体,但由环残基形成多层帽结构。虽然这种结构只能在没有任何5′-侧翼残基的特定截短的端粒序列中检测到,但我们的研究结果表明,这种两个G-四链体构象可能是不同端粒G-四链体构象相互转化的中间形式。
Human telomeric DNA G-quadruplex has been considered as an attractive target for cancer therapeutic intervention. The telomeric sequence shows intrinsic structure polymorphism. Here we report a novel intramolecular G-quadruplex structure formed by a variant human telomeric sequence in K+ solution. This sequence forms a basket-type intramolecular G-quadruplex with only two G-tetrads but multiple-layer capping structures formed by loop residues. While it is shown that this structure can only be detected in the specifically truncated telomeric sequences without any 5′-flanking residues, our results suggest that this two-G-tetrad conformation is likely to be an intermediate form of the interconversion of different telomeric G-quadruplex conformations.
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