NMR Dynamics Study Reveals the Zα Domain of Human ADAR1 Associates with and Dissociates from Z-RNA More Slowly than Z-DNA
- NMR Dynamics Study Reveals the Zα Domain of Human ADAR1 Associates with and Dissociates from Z-RNA More Slowly than Z-DNA
- 김낙균; Ae-Ree Lee; Jihyun Hwang; Jeong Hwan Hur; Kyeong Kyu Kim; Byong-Seok Choi; Joon-Hwa Lee; Kyoung-Seok Ryu
- Issue Date
- ACS Chemical Biology
- VOL 14, NO 2-255
- Human RNA editing enzyme ADAR1 deaminates adenosine in pre-mRNA to yield inosine. The Zα domain of human ADAR1 (hZαADAR1) binds specifically to left-handed Z-RNA as well as Z-DNA and stabilizes the Z-conformation. To answer the question of how hZαADAR1 can induce both the B– Z transition of DNA and the A– Z transition of RNA, we investigated the structure and dynamics of hZαADAR1 in complex with 6-base-pair Z-DNA or Z-RNA. We performed chemical shift perturbation and relaxation dispersion experiments on hZαADAR1 upon binding to Z-DNA as well as Z-RNA. Our study demonstrates the unique dynamics of hZαADAR1 during the A– Z transition of RNA, in which the hZαADAR1 protein forms a thermodynamically stable complex with Z-RNA, similar to Z-DNA, but kinetically converts RNA to the Z-form more slowly than DNA. We also discovered some distinct structural features of hZαADAR1 in the Z-RNA binding conformation. Our results suggest that the A– Z transition of RNA facilitated by hZαADAR1 displays unique structural and dynamic features that may be involved in targeting ADAR1 for a role in recognition of RNA substrates.
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