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Ability of spermine to differentiate between DNA sequences - Preferential stabilization of A-tracts

机译:精胺区分DNA序列的能力-A道优先稳定

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The regulatory roles fulfilled by polyamines by governance of chromatin structure are made possible by their strong association with cellular DNA, and hence by their ability to modulate DNA structure and function. Towards this end, it is crucial to understand the manifestation of sequence-dependent polyamine binding at the secondary and tertiary structural levels of DNA. This study utilizes circular dichroism (CD) and isothermal titration calorimetry (ITC) to address this relationship by using 20bp oligonucleotides with sequences-poly(dA):poly(dT), poly (dAdT):poly(dAdT), poly(dG):poly(dC), poly(dGC):poly(dGdC)-that yield physiologically relevant structures, and poly(dIdC):poly(dIdC). CD studies show that at physiological ionic strength (150 mM NaCl), spermine preferentially stabilizes A-tracts, and increases flexibility of the G-tract oligomer; the latter is also suggested by the larger change in entropy (AS) of spermine binding to G-tracts. Given the chromatin destabilizing property of these sequences, these findings suggest a role for spermine in stabilization of non-nucleosomal A-tracts, and a compensating mechanism for incorporation of G-tracts in the chromatin structure. Other implications of these findings in sequence dependent DNA packaging are discussed. (c) 2006 Elsevier B.V. All rights reserved.
机译:多胺通过染色质结构的控制而发挥的调节作用,由于其与细胞DNA的强结合以及因此它们调节DNA结构和功能的能力而成为可能。为此,至关重要的是要了解DNA二级和三级结构水平上依赖序列的多胺结合的表现。这项研究利用圆二色性(CD)和等温滴定量热(ITC)来解决此关系,方法是使用20bp寡核苷酸,其序列为poly(dA):poly(dT),poly(dAdT):poly(dAdT),poly(dG) :poly(dC),poly(dGC):poly(dGdC)-产生生理上相关的结构,以及poly(dIdC):poly(dIdC)。 CD研究表明,在生理离子强度(150 mM NaCl)下,精胺可优先稳定A束,并增加G束低聚物的柔韧性;精胺与G结合的熵(AS)的较大变化也提示了后者。考虑到这些序列的染色质去稳定特性,这些发现表明精胺在稳定非核小体A区域中的作用,以及在染色质结构中掺入G区域的补偿机制。讨论了这些发现在依赖序列的DNA包装中的其他含义。 (c)2006 Elsevier B.V.保留所有权利。

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