8UFM | pdb_00008ufm

Crystal Structure of L516C/Y647C Mutant of SARS-Unique Domain (SUD) from SARS-CoV-2

• PDB DOI: https://doi.org/10.2210/pdb8UFM/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Severe acute respiratory syndrome coronavirus 2
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2023-10-04 Released: 2023-10-18 
• Deposition Author(s): Minasov, G., Shuvalova, L., Brunzelle, J.S., Rosas-Lemus, M., Kiryukhina, O., Satchell, K.J.F., Center for Structural Genomics of Infectious Diseases (CSGID), Center for Structural Biology of Infectious Diseases (CSBID)
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 
  0.208 (Depositor), 0.220 (DCC) 
• R-Value Work: 
  0.185 (Depositor), 0.190 (DCC) 
• R-Value Observed: 
  0.186 (Depositor) 

Starting Model: experimental

Literature

Torsional twist of the SARS-CoV and SARS-CoV-2 SUD-N and SUD-M domains.

Rosas-Lemus, M., Minasov, G., Brunzelle, J.S., Taha, T.Y., Lemak, S., Yin, S., Shuvalova, L., Rosecrans, J., Khanna, K., Seifert, H.S., Savchenko, A., Stogios, P.J., Ott, M., Satchell, K.J.F.

(2025) Protein Sci 34: e70050-e70050

• PubMed: 39969084 
• DOI: https://doi.org/10.1002/pro.70050
• Primary Citation of Related Structures:  
  8UFL, 8UFM


• PubMed Abstract: 
  

  Coronavirus non-structural protein 3 (nsp3) forms hexameric crowns of pores in the double membrane vesicle that houses the replication-transcription complex. Nsp3 in SARS-like viruses has three unique domains absent in other coronavirus nsp3 proteins. Two of these, SUD-N (Macrodomain 2) and SUD-M (Macrodomain 3), form two lobes connected by a peptide linker and an interdomain disulfide bridge. We resolve the first complete x-ray structure of SARS-CoV SUD-N/M as well as a mutant variant of SARS-CoV-2 SUD-N/M modified to restore cysteines for interdomain disulfide bond naturally lost by evolution. Comparative analysis of all structures revealed SUD-N and SUD-M are not rigidly associated but rather have significant rotational flexibility. Phylogenetic analysis supports that the potential to form the disulfide bond is common across betacoronavirus isolates from many bat species and civets, but also one or both of the cysteines that form the disulfide bond are absent across isolates from bats and pangolins. The absence of these cysteines does not impact viral replication or protein translation.

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Organizational Affiliation: 
• Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.
Center for Structural Biology of Infectious Diseases, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.
Northwestern Synchrotron Research Center, Life Sciences Collaborative Access Team, Northwestern University, Argonne, Illinois, USA.
Gladstone Institute of Virology, Gladstone Institutes, San Francisco, California, USA.
BioZone, Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, Canada.
Department of Pharmacology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.
Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, Alberta, Canada.
Department of Medicine, University of California at San Francisco, San Francisco, California, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 30.54 kDa 
• Atom Count: 2,209 
• Modeled Residue Count: 249 
• Deposited Residue Count: 269 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Papain-like protease nsp3	A	269	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 2  EC: 3.4.19.12 (PDB Primary Data), 3.4.22 (PDB Primary Data)
UniProt
Find proteins for P0C6X7 (Severe acute respiratory syndrome coronavirus) Explore P0C6X7  Go to UniProtKB:  P0C6X7

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ACT	C [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
FMT	B [auth A]	FORMIC ACID C H2 O2 BDAGIHXWWSANSR-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free:  0.208 (Depositor), 0.220 (DCC) 
• R-Value Work:  0.185 (Depositor), 0.190 (DCC) 
• R-Value Observed: 0.186 (Depositor) 

Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 86.274	α = 90
b = 86.274	β = 90
c = 76.674	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-3000	data reduction
HKL-3000	data scaling
MOLREP	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-10-18 
Deposition Author(s): Minasov, G., Shuvalova, L., Brunzelle, J.S., Rosas-Lemus, M., Kiryukhina, O., Satchell, K.J.F., Center for Structural Genomics of Infectious Diseases (CSGID), Center for Structural Biology of Infectious Diseases (CSBID)

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	HHSN272201700060C

Revision History  

• Version 1.0: 2023-10-18
  Type: Initial release
  
• Version 1.1: 2023-11-15
  Changes: Data collection
• Version 1.2: 2024-10-16
  Changes: Structure summary
• Version 1.3: 2025-09-24
  Changes: Database references