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Single-Strand DNA Binding Proteins

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...

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Updated: Dec 24, 2025

Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis

Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis

Published on: January 7, 2017

产生具有高亲和度和热稳定的生物稳定的TNA适合剂

Matthew R Dunn, Cailen M McCloskey, Patricia Buckley¹

¹U.S. Army CCDC Chemical Biological Center, APG, Maryland 21010, United States.

Journal of the American Chemical Society

|April 17, 2020

概括

这项研究引入了一种新型的外核酸,α-l-threofuranosyl核酸 (TNA),它对核酶消化具有抗性. 针对HIV逆转录酶的TNA向体具有很高的亲和力和稳定性,为新的诊断和治疗工具提供了潜力.

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Primer-Free Aptamer Selection Using A Random DNA Library

Primer-Free Aptamer Selection Using A Random DNA Library

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Published on: January 7, 2017

Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor

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Primer-Free Aptamer Selection Using A Random DNA Library

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科学领域:

生物化学
分子生物学
核酸化学

背景情况:

由于对核酶降解的敏感性,aptamers在生物医学应用中受到限制.
异核酸提供了增强稳定性和功能性的潜力.

研究的目的:

使用α-l-threofuranosyl核酸 (TNA) 开发一种耐核酶的阿胺系统.
隔离和表征具有高结合性HIV逆转录酶 (HIVRT) 的TNA体.

主要方法:

开发一种工程TNA聚合酶用于胺合成.
使用显示策略将针对HIVRT的TNA合物分离.
结合亲和度 (K_D) 和热稳定性的表征.

主要成果:

TNA 体表现出对核酶消化的完全抵抗性.
隔离的TNA体与高亲和度的HIVRT结合 (K_Ds为0. 4- 4. 0nM).
与单克隆抗体相比,TNA的热稳定性更高.

结论:

TNA 体是一种与传统体具有生物学稳定性和高度亲属性的替代品.
在诊断和治疗应用中,TNA 体的抗核酶和热稳定性是有利的.
这种TNA系统为开发新生物医学药物提供了强大的平台.