The Structure of Transcription Termination Factor Nrd1 Reveals an Original Mode for GUAA Recognition
Overview
Authors
Affiliations
Transcription termination of non-coding RNAs is regulated in yeast by a complex of three RNA binding proteins: Nrd1, Nab3 and Sen1. Nrd1 is central in this process by interacting with Rbp1 of RNA polymerase II, Trf4 of TRAMP and GUAA/G terminator sequences. We lack structural data for the last of these binding events. We determined the structures of Nrd1 RNA binding domain and its complexes with three GUAA-containing RNAs, characterized RNA binding energetics and tested rationally designed mutants in vivo. The Nrd1 structure shows an RRM domain fused with a second α/β domain that we name split domain (SD), because it is formed by two non-consecutive segments at each side of the RRM. The GUAA interacts with both domains and with a pocket of water molecules, trapped between the two stacking adenines and the SD. Comprehensive binding studies demonstrate for the first time that Nrd1 has a slight preference for GUAA over GUAG and genetic and functional studies suggest that Nrd1 RNA binding domain might play further roles in non-coding RNAs transcription termination.
Kadooka C, Izumitsu K, Asai T, Hiramatsu K, Mori K, Okutsu K mSphere. 2025; 10(2):e0084924.
PMID: 39853104 PMC: 11852746. DOI: 10.1128/msphere.00849-24.
The Nrd1-Nab3-Sen1 transcription termination complex from a structural perspective.
Chaves-Arquero B, Perez-Canadillas J Biochem Soc Trans. 2023; 51(3):1257-1269.
PMID: 37222282 PMC: 10317158. DOI: 10.1042/BST20221418.
Yoon S, Jang E, Ko N, Kim M, Kim S, Moon Y Int J Mol Sci. 2022; 23(4).
PMID: 35216480 PMC: 8874555. DOI: 10.3390/ijms23042364.
Structural basis of Nrd1-Nab3 heterodimerization.
Chaves-Arquero B, Martinez-Lumbreras S, Camero S, Santiveri C, Mirassou Y, Campos-Olivas R Life Sci Alliance. 2022; 5(4).
PMID: 35022249 PMC: 8761494. DOI: 10.26508/lsa.202101252.
Schwer B, Garg A, Jacewicz A, Shuman S Proc Natl Acad Sci U S A. 2021; 118(33).
PMID: 34389684 PMC: 8379984. DOI: 10.1073/pnas.2108105118.