Cited by 21SARS-CoV-2 and COVID-19 ResearchRNA and protein synthesis mechanismsRNA Research and Splicing

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Mutagenesis and structural studies reveal the basis for the specific binding of SARS-CoV-2 SL3 RNA element with human TIA1 protein

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Abstract

Viral RNA-host protein interactions are indispensable during RNA virus transcription and replication, but their detailed structural and dynamical features remain largely elusive. Here, we characterize the binding interface for the SARS-CoV-2 stem-loop 3 (SL3) cis-acting element to human TIA1 protein with a combined theoretical and experimental approaches. The highly structured SARS-CoV-2 SL3 has a high binding affinity to TIA1 protein, in which the aromatic stacking, hydrogen bonds, and hydrophobic interactions collectively direct this specific binding. Further mutagenesis studies validate our proposed 3D binding model and reveal two SL3 variants have enhanced binding affinities to TIA1. And disruptions of the identified RNA-protein interactions with designed antisense oligonucleotides dramatically reduce SARS-CoV-2 infection in cells. Finally, TIA1 protein could interact with conserved SL3 RNA elements within other betacoronavirus lineages. These findings open an avenue to explore the viral RNA-host protein interactions and provide a pioneering structural basis for RNA-targeting antiviral drug design.

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Figures

Fig. 1 Structures of SARS-CoV-2 RNA genome stem-loop (SL) SL2 and SL3 elements and their binding ability to human TIA1 protein. a Architecture of TIA1 RNA recognition motif (RRM) RRM2 and RRM3 domains. RRM2 and RRM3 adopt the canonical βαββαβ RRM fold composed of four anti-parallel β-sheets (β1, β2, β3, and β4) and two α-helices (α1 and α2). A non-canonical helix α0 in the flexible linker is preceded to RRM3. Secondary and 3D structures for (b) SL2 and (c) SL3 RNA elements. Stem, hairpin loop, and terminal loop in 5′-/3′-end are colored by green, blue, and orange, respectively. All 3D structures are predicted by IsRNA2 model. The NMR solution structure (1st model) for SARS-CoV SL232 (PDB id: 2l6i) is given in gray in (b). Other possible 3D conformations for SL3 element predicted by IsRNA2 are shown in light gray in (c). Positions from the whole SARS-CoV-2 RNA genome for SL2 and SL3 elements are provided in parentheses. d EMSA results (left) and the binding curve (right) show TIA1 bound to 5′ end Cy3-labeled SL2 + SL3 RNA. The binding curves for individual (e) SL2 and (f) SL3 RNA element with TIA1 protein. From d to f, the Kd values were calculated from the EMSA image quantification from three independent experiments. Data are presented as mean ± SD. Source data are provided as a Source Data file.
Fig. 1 Structures of SARS-CoV-2 RNA genome stem-loop (SL) SL2 and SL3 elements and their binding ability to human TIA1 protein. a Architecture of TIA1 RNA recognition motif (RRM) RRM2 and RRM3 domains. RRM2 and RRM3 adopt the canonical βαββαβ RRM fold composed of four anti-parallel β-sheets (β1, β2, β3, and β4) and two α-helices (α1 and α2). A non-canonical helix α0 in the flexible linker is preceded to RRM3. Secondary and 3D structures for (b) SL2 and (c) SL3 RNA elements. Stem, hairpin loop, and terminal loop in 5′-/3′-end are colored by green, blue, and orange, respectively. All 3D structures are predicted by IsRNA2 model. The NMR solution structure (1st model) for SARS-CoV SL232 (PDB id: 2l6i) is given in gray in (b). Other possible 3D conformations for SL3 element predicted by IsRNA2 are shown in light gray in (c). Positions from the whole SARS-CoV-2 RNA genome for SL2 and SL3 elements are provided in parentheses. d EMSA results (left) and the binding curve (right) show TIA1 bound to 5′ end Cy3-labeled SL2 + SL3 RNA. The binding curves for individual (e) SL2 and (f) SL3 RNA element with TIA1 protein. From d to f, the Kd values were calculated from the EMSA image quantification from three independent experiments. Data are presented as mean ± SD. Source data are provided as a Source Data file.CC BY · PubMed Central
Fig. 2 Binding capabilities of various SL3 RNA variants with human TIA1 protein. a WT SL3 consists of a 7-nt hairpin loop (HP), a 4-base pairs stem, and a 5-nt 3′-terminal loop (TL). The binding curves of human TIA1 protein with various mutated and truncated variants of SL3 RNA element: b SL3-HP3, the 7-nt HP reduced to 3-nt length, c SL3-HP-C7, sequence of 7-nt HP mutated to oligo C, (d) SL3-HP-U7, sequence of 7-nt HP mutated to oligo U, e SL3-TL1, last four nucleotides of 5-nt TL deleted, f SL3-TL-C3, three successive uridines in TL replaced by three cytosines, g SL3-TL-G3, three successive uridines in TL replaced by three guanines, h SL3-GC, two middle A-U base pairs in the stem substituted by G-C base pairs. All the secondary structures for SL3 variants are predicted by RNAStructure36 and mutated nucleotides are colored by red. All the Kd values were calculated from the EMSA image quantification from three independent experiments. Data are presented as mean ± SD. i The yield of the bona fide SARS-CoV-2 virus with designed ASOs targeting SL3 RNA elements (including HP and TL loops and the transcriptional regulatory sequence (TRS)) in Huh7.5.1 cells for 24 h, compared to the “scramble” control treated with a non-targeting ASO. SL2/3 has previously been reported18. Data represent the mean ± SEM; n = 3 biological replicates. ***p = 3.4 × 10−6 (ASO-SL2/3), 4.4 × 10−7 (ASO-HP), 1.2 × 10−5 (ASO-TL), and 1.6 × 10−7 (ASO-TRS) using unpaired two-sample Student’s t test. Source data are provided as a Source Data file.
Fig. 2 Binding capabilities of various SL3 RNA variants with human TIA1 protein. a WT SL3 consists of a 7-nt hairpin loop (HP), a 4-base pairs stem, and a 5-nt 3′-terminal loop (TL). The binding curves of human TIA1 protein with various mutated and truncated variants of SL3 RNA element: b SL3-HP3, the 7-nt HP reduced to 3-nt length, c SL3-HP-C7, sequence of 7-nt HP mutated to oligo C, (d) SL3-HP-U7, sequence of 7-nt HP mutated to oligo U, e SL3-TL1, last four nucleotides of 5-nt TL deleted, f SL3-TL-C3, three successive uridines in TL replaced by three cytosines, g SL3-TL-G3, three successive uridines in TL replaced by three guanines, h SL3-GC, two middle A-U base pairs in the stem substituted by G-C base pairs. All the secondary structures for SL3 variants are predicted by RNAStructure36 and mutated nucleotides are colored by red. All the Kd values were calculated from the EMSA image quantification from three independent experiments. Data are presented as mean ± SD. i The yield of the bona fide SARS-CoV-2 virus with designed ASOs targeting SL3 RNA elements (including HP and TL loops and the transcriptional regulatory sequence (TRS)) in Huh7.5.1 cells for 24 h, compared to the “scramble” control treated with a non-targeting ASO. SL2/3 has previously been reported18. Data represent the mean ± SEM; n = 3 biological replicates. ***p = 3.4 × 10−6 (ASO-SL2/3), 4.4 × 10−7 (ASO-HP), 1.2 × 10−5 (ASO-TL), and 1.6 × 10−7 (ASO-TRS) using unpaired two-sample Student’s t test. Source data are provided as a Source Data file.CC BY · PubMed Central
Fig. 3 The putative 3D binding model for SARS-CoV-2 SL3 RNA element and human TIA1 complex. a Overview of the most probable 3D structure of binding complex constructed by computational modeling. TIA1 RRM2, RRM3, and flexible linker are colored by sky blue, light green, and gray, respectively. Hairpin loop, stem, and terminal loop of SL3 are separately colored by blue, green, and orange. Details of interactions between TIA1 RRM3 and nucleotides (b) U67, (c) A68 and A69 in hairpin loop region of SL3 element. Details of interactions between TIA1 RRM2 and nucleotides (d) U76, (e) U77, and (f) U78 in 3′-terminal loop of SL3. Atoms of phosphorus, oxygen, nitrogen, and hydrogen are colored yellow, red, purple, and white, respectively, and carbon atoms are colored according to their locations. Hydrogen bonds between RNA nucleotides and TIA1 residues are indicated by thin black lines. Rotations may be adopted to display the interaction details in subfigures (b–f).
Fig. 3 The putative 3D binding model for SARS-CoV-2 SL3 RNA element and human TIA1 complex. a Overview of the most probable 3D structure of binding complex constructed by computational modeling. TIA1 RRM2, RRM3, and flexible linker are colored by sky blue, light green, and gray, respectively. Hairpin loop, stem, and terminal loop of SL3 are separately colored by blue, green, and orange. Details of interactions between TIA1 RRM3 and nucleotides (b) U67, (c) A68 and A69 in hairpin loop region of SL3 element. Details of interactions between TIA1 RRM2 and nucleotides (d) U76, (e) U77, and (f) U78 in 3′-terminal loop of SL3. Atoms of phosphorus, oxygen, nitrogen, and hydrogen are colored yellow, red, purple, and white, respectively, and carbon atoms are colored according to their locations. Hydrogen bonds between RNA nucleotides and TIA1 residues are indicated by thin black lines. Rotations may be adopted to display the interaction details in subfigures (b–f).CC BY · PubMed Central
Fig. 4 Influence of single nucleotide mutations of SL3 RNA element on TIA1 binding. a The relative binding free energy changes ΔΔGcalc for exhaustive single nucleotide mutations of six identified sites that are important for SL3 binding. ΔΔGcalc<0 means enhanced binding affinity with TIA1 protein than wild type SL3 element, and vice versa. Five independent FEP calculations were run and data are presented as mean ± SD. b Comparison of the relative binding free energy changes derived from FEP calculations (ΔΔGcalc) and EMSA experiments (ΔΔGexp) for twelve representative mutations of SL3. The linear fit to the data is shown as a red line and R is the Pearson correlation coefficient. Five independent FEP calculations were run for ΔΔGcalc and data are presented as mean ± SD. The values of ΔΔGexp were derived from three independent EMSA experiments and data are presented as mean ± SD. Source data are provided as a Source Data file. Structural details before (left) and after (right) mutations for SL3 (c) A68U and (d) A69C variants. The phosphorus, oxygen, nitrogen, and hydrogen atoms are colored by yellow, red, purple, and white, respectively. The carbon atoms in SL3 and TIA1 are separately colored to blue and light green. Black dash lines indicate the distances of given atom pairs.
Fig. 4 Influence of single nucleotide mutations of SL3 RNA element on TIA1 binding. a The relative binding free energy changes ΔΔGcalc for exhaustive single nucleotide mutations of six identified sites that are important for SL3 binding. ΔΔGcalc<0 means enhanced binding affinity with TIA1 protein than wild type SL3 element, and vice versa. Five independent FEP calculations were run and data are presented as mean ± SD. b Comparison of the relative binding free energy changes derived from FEP calculations (ΔΔGcalc) and EMSA experiments (ΔΔGexp) for twelve representative mutations of SL3. The linear fit to the data is shown as a red line and R is the Pearson correlation coefficient. Five independent FEP calculations were run for ΔΔGcalc and data are presented as mean ± SD. The values of ΔΔGexp were derived from three independent EMSA experiments and data are presented as mean ± SD. Source data are provided as a Source Data file. Structural details before (left) and after (right) mutations for SL3 (c) A68U and (d) A69C variants. The phosphorus, oxygen, nitrogen, and hydrogen atoms are colored by yellow, red, purple, and white, respectively. The carbon atoms in SL3 and TIA1 are separately colored to blue and light green. Black dash lines indicate the distances of given atom pairs.CC BY · PubMed Central
Fig. 5 Sequence comparison of SL3 RNA elements in betacoronavirus genomes and their binding abilities to human TIA1 protein. a Multiple sequence alignment showing nucleotide coverage within SL3 RNA elements of representative species within genus Betacoronavirus. The transcriptional regulatory sequences (TRS) are highlighted by red box. Six identified sites important for SARS-CoV-2 SL3 binding by TIA1 protein are marked by red triangles. Sequence positions of SL3 RNA element in each species are given in parentheses. BatHp, Bat Hp-betacoronavirus/Zhejiang2013; RousettusBat, Rousettus bat coronavirus; RousettusBatHKU9, Rousettus bat coronavirus HKU9; PipistrellusBat, Pipistrellus bat coronavirus HKU5; TylonycterisBat, Tylonycteris bat coronavirus HKU4; England1, Betacoronavirus England 1; MERS, Middle East respiratory syndrome-related coronavirus; Erinaceus, Betacoronavirus Erinaceus/VMC/DEU/2012. The binding curves between human TIA1 protein and SL3 RNA elements from (b) RousettusBatHKU9 and (c) MERS genomes. The Kd values were calculated from the EMSA image quantification from three independent experiments. Data are presented as mean ± SD. Source data are provided as a Source Data file.
Fig. 5 Sequence comparison of SL3 RNA elements in betacoronavirus genomes and their binding abilities to human TIA1 protein. a Multiple sequence alignment showing nucleotide coverage within SL3 RNA elements of representative species within genus Betacoronavirus. The transcriptional regulatory sequences (TRS) are highlighted by red box. Six identified sites important for SARS-CoV-2 SL3 binding by TIA1 protein are marked by red triangles. Sequence positions of SL3 RNA element in each species are given in parentheses. BatHp, Bat Hp-betacoronavirus/Zhejiang2013; RousettusBat, Rousettus bat coronavirus; RousettusBatHKU9, Rousettus bat coronavirus HKU9; PipistrellusBat, Pipistrellus bat coronavirus HKU5; TylonycterisBat, Tylonycteris bat coronavirus HKU4; England1, Betacoronavirus England 1; MERS, Middle East respiratory syndrome-related coronavirus; Erinaceus, Betacoronavirus Erinaceus/VMC/DEU/2012. The binding curves between human TIA1 protein and SL3 RNA elements from (b) RousettusBatHKU9 and (c) MERS genomes. The Kd values were calculated from the EMSA image quantification from three independent experiments. Data are presented as mean ± SD. Source data are provided as a Source Data file.CC BY · PubMed Central

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Metadata

Authors
Zhang, D., Qiao, L., Lei, X., Dong, X., Tong, Y., Wang, J., Wang, Z., & Zhou, R.
Affiliations
  • Zhejiang University (CN)
  • State Key Laboratory of Plant Physiology and Biochemistry (CN)
  • Chinese Academy of Medical Sciences & Peking Union Medical College (CN)
  • China Jiliang University (CN)
  • First Affiliated Hospital Zhejiang University (CN)
Corresponding author
  • Wang, Jianwei
  • Wang, Zhiye
  • Zhou, Ruhong
Venue
Nature Communications
Published
2023-06-22
Volume
14
Issue
1
Pages
3715-3715
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4381683186
Cited by
21
References
6
Citations by year
2026: 6 · 2025: 7 · 2024: 7 · 2023: 1
FWCI
4.35
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Natural Science Foundation of China (12104396, U1967217, 81930063)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
Keywords
SARS-CoV-2, RNA-protein interactions, cis-acting RNA elements, binding interface, mutagenesis, antisense oligonucleotides, Betacoronavirus
MeSH terms
T-Cell Intracellular Antigen-1, COVID-19, SARS-CoV-2, Humans, Protein Binding, RNA, Viral, Mutagenesis

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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