7LW3

Structure of SARS-CoV-2 nsp16/nsp10 complex in presence of Cap-1 analog (m7GpppAmU) and SAH

PDB DOI: https://doi.org/10.2210/pdb7LW3/pdb

Classification: HYDROLASE
Organism(s): Severe acute respiratory syndrome coronavirus 2
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2021-02-27 Released: 2021-05-05
Deposition Author(s): Gupta, Y.K., Viswanathan, T., Misra, A., Qi, S.
Funding Organization(s): Other private

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.30 Å
R-Value Free: 0.251
R-Value Work: 0.222
R-Value Observed: 0.224

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.2 of the entry. See complete history.

Literature

A metal ion orients SARS-CoV-2 mRNA to ensure accurate 2'-O methylation of its first nucleotide.

Viswanathan, T., Misra, A., Chan, S.H., Qi, S., Dai, N., Arya, S., Martinez-Sobrido, L., Gupta, Y.K.

(2021) Nat Commun 12: 3287-3287

PubMed: 34078893 Search on PubMedSearch on PubMed Central
DOI: https://doi.org/10.1038/s41467-021-23594-y
Primary Citation of Related Structures:
7LW3, 7LW4

PubMed Abstract:
The SARS-CoV-2 nsp16/nsp10 enzyme complex modifies the 2'-OH of the first transcribed nucleotide of the viral mRNA by covalently attaching a methyl group to it. The 2'-O methylation of the first nucleotide converts the status of mRNA cap from Cap-0 to Cap-1, and thus, helps the virus evade immune surveillance in host cells. Here, we report two structures of nsp16/nsp10 representing pre- and post-release states of the RNA product (Cap-1). We observe overall widening of the enzyme upon product formation, and an inward twisting motion in the substrate binding region upon product release. These conformational changes reset the enzyme for the next round of catalysis. The structures also identify a unique binding mode and the importance of a divalent metal ion for 2'-O methylation. We also describe underlying structural basis for the perturbed enzymatic activity of a clinical variant of SARS-CoV-2, and a previous SARS-CoV outbreak strain.

Organizational Affiliation

Greehey Children's Cancer Research Institute, University of Texas Health at San Antonio, San Antonio, TX, USA.

Macromolecule Content

Total Structure Weight: 50.09 kDa
Atom Count: 3,444
Modelled Residue Count: 413
Deposited Residue Count: 437
Unique protein chains: 2

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
2'-O-methyltransferase	A	298	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0 Gene Names: rep, 1a-1b EC: 2.1.1
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTD1 Go to UniProtKB: P0DTD1
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P0DTD1
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Non-structural protein 10	B	139	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0 Gene Names: rep, 1a-1b
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTD1 Go to UniProtKB: P0DTD1
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P0DTD1
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 6 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
YG4 (Subject of Investigation/LOI) Query on YG4 Download Ideal Coordinates CCD File SDF format, chain F [auth A] MOL2 format, chain F [auth A]	F [auth A]	[(2~{R},3~{R},4~{R},5~{R})-5-(6-azanyl-7,8-dihydropurin-9-yl)-2-[[[[[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-7-methyl-6-oxidanylidene-1,8-dihydropurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxymethyl]-4-methoxy-oxolan-3-yl] [(2~{R},3~{S},4~{R},5~{S})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl hydrogen phosphate C₃₁ H₄₆ N₁₂ O₂₅ P₄ POOGENYSODSFCS-SWDLWUBYSA-N		Interactions Focus chain F [auth A] Interactions & Density Focus chain F [auth A]
SAH (Subject of Investigation/LOI) Query on SAH Download Ideal Coordinates CCD File SDF format, chain E [auth A] MOL2 format, chain E [auth A]	E [auth A]	S-ADENOSYL-L-HOMOCYSTEINE C₁₄ H₂₀ N₆ O₅ S ZJUKTBDSGOFHSH-WFMPWKQPSA-N		Interactions Focus chain E [auth A] Interactions & Density Focus chain E [auth A]
MES Query on MES Download Ideal Coordinates CCD File SDF format, chain C [auth A] MOL2 format, chain C [auth A]	C [auth A]	2-(N-MORPHOLINO)-ETHANESULFONIC ACID C₆ H₁₃ N O₄ S SXGZJKUKBWWHRA-UHFFFAOYSA-N		Interactions Focus chain C [auth A] Interactions & Density Focus chain C [auth A]
ZN Query on ZN Download Ideal Coordinates CCD File SDF format, chain H [auth B] SDF format, chain I [auth B] MOL2 format, chain H [auth B] MOL2 format, chain I [auth B]	H [auth B], I [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N		Interactions Focus chain H [auth B] Focus chain I [auth B] Interactions & Density Focus chain H [auth B] Focus chain I [auth B]
EDO Query on EDO Download Ideal Coordinates CCD File SDF format, chain G [auth B] MOL2 format, chain G [auth B]	G [auth B]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain G [auth B] Interactions & Density Focus chain G [auth B]
MG (Subject of Investigation/LOI) Query on MG Download Ideal Coordinates CCD File SDF format, chain D [auth A] MOL2 format, chain D [auth A]	D [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain D [auth A] Interactions & Density Focus chain D [auth A]