National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM122579
米国
Howard Hughes Medical Institute (HHMI)
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24GM129541
米国
National Science Foundation (NSF, United States)
GRFPDGE1656518
米国
Ministry of Science and Technology (MoST, China)
2022YFC2303700
中国
Ministry of Science and Technology (MoST, China)
2022YFA1302700
中国
Other private
BioX Bowes fellowship
米国
Other private
BioX Interdisciplinary Initiative Program
米国
Other private
ChEM-H COVID-19 Drug and Vaccine Prototyping seed grant
米国
Department of Energy (DOE, United States)
Coronavirus CARES Act
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
#U19AI171421
米国
引用
ジャーナル: bioRxiv / 年: 2023 タイトル: Tertiary folds of the SL5 RNA from the 5' proximal region of SARS-CoV-2 and related coronaviruses. 著者: Rachael C Kretsch / Lily Xu / Ivan N Zheludev / Xueting Zhou / Rui Huang / Grace Nye / Shanshan Li / Kaiming Zhang / Wah Chiu / Rhiju Das / 要旨: Coronavirus genomes sequester their start codons within stem-loop 5 (SL5), a structured, 5' genomic RNA element. In most alpha- and betacoronaviruses, the secondary structure of SL5 is predicted to ...Coronavirus genomes sequester their start codons within stem-loop 5 (SL5), a structured, 5' genomic RNA element. In most alpha- and betacoronaviruses, the secondary structure of SL5 is predicted to contain a four-way junction of helical stems, some of which are capped with UUYYGU hexaloops. Here, using cryogenic electron microscopy (cryo-EM) and computational modeling with biochemically-determined secondary structures, we present three-dimensional structures of SL5 from six coronaviruses. The SL5 domain of betacoronavirus SARS-CoV-2, resolved at 4.7 Å resolution, exhibits a T-shaped structure, with its UUYYGU hexaloops at opposing ends of a coaxial stack, the T's "arms." Further analysis of SL5 domains from SARS-CoV-1 and MERS (7.1 and 6.4-6.9 Å resolution, respectively) indicate that the junction geometry and inter-hexaloop distances are conserved features across the studied human-infecting betacoronaviruses. The MERS SL5 domain displays an additional tertiary interaction, which is also observed in the non-human-infecting betacoronavirus BtCoV-HKU5 (5.9-8.0 Å resolution). SL5s from human-infecting alphacoronaviruses, HCoV-229E and HCoV-NL63 (6.5 and 8.4-9.0 Å resolution, respectively), exhibit the same coaxial stacks, including the UUYYGU-capped arms, but with a phylogenetically distinct crossing angle, an X-shape. As such, all SL5 domains studied herein fold into stable tertiary structures with cross-genus similarities, with implications for potential protein-binding modes and therapeutic targets.