A photochemically covalent lock stabilizes aptamer conformation and strengthens its performance for biomedicine. Issue 16 (22nd August 2022)

• Record Type: Journal Article
• Authors: Zhou, Fang; Wang, Peng; Chen, Jianghuai; Zhu, Zhijia; Li, Youshan; Wang, Sujuan; Wu, Shanchao; Sima, Yingyu; Fu, Ting; Tan, Weihong; Zhao, Zilong
• Is Part Of: Nucleic acids research. Volume 50:Issue 16(2022)
• Page Start: 9039
• Page End: 9050
• Publication Date: 2022-08-22
• Subjects: Nucleic acids -- Periodicals; Molecular biology -- Periodicals; 572.805
• DOI: 10.1093/nar/gkac703
• Languages: English
• ISSNs: 0305-1048

Abstract

Abstract: Aptamers' vast conformation ensemble consisting of interconverting substates severely impairs their performance and applications in biomedicine. Therefore, developing new chemistries stabilizing aptamer conformation and exploring the conformation–performance relationship are highly desired. Herein, we developed an 8-methoxypsoralen-based photochemically covalent lock to stabilize aptamer conformation via crosslinking the inter-stranded thymine nucleotides at TpA sites. Systematical studies and molecular dynamics simulations were performed to explore the conformation–performance relationship of aptamers, revealing that conformation-stabilized aptamers displayed better ability to bind targets, adapt to physiological environment, resist macrophage uptake, prolong circulation half-life, accumulate in and penetrate into tumor than their counterparts. As expected, conformation-stabilized aptamers efficiently improved the therapeutic efficacy of aptamer-drug conjugation on tumor-bearing mice. Collectively, our study has developed a general, simple and economic strategy to stabilize aptamer conformation and shed light on the conformation–performance relationship of aptamers, laying a basis for promoting their basic researches and applications in biomedicine. Graphical Abstract: