9BC1 | pdb_00009bc1

SARS-CoV-2 Mpro in complex with peptide mimetic inhibitor

• PDB DOI: https://doi.org/10.2210/pdb9BC1/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Severe acute respiratory syndrome coronavirus 2, synthetic construct
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2024-04-07 Released: 2025-04-23 
• Deposition Author(s): Afsar, M., Priscila, B., Olsen, S.K.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Cancer Prevention and Research Institute of Texas (CPRIT)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.72 Å
• R-Value Free: 
  0.200 (Depositor), 0.211 (DCC) 
• R-Value Work: 
  0.183 (Depositor) 
• R-Value Observed: 
  0.184 (Depositor) 

Starting Model: experimental

Literature

SARS-CoV-2 Mpro in complex with peptide mimetic inhibitor

Afsar, M., Priscila, B., Olsen, S.K.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content 

• Total Structure Weight: 68.84 kDa 
• Atom Count: 5,101 
• Modeled Residue Count: 614 
• Deposited Residue Count: 622 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase nsp5	A, B	306	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0  Gene Names: rep, 1a-1b EC: 3.4.22.69
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTD1  Go to UniProtKB:  P0DTD1

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
peptide mimetic inhibitor	C, D	5	synthetic construct	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ABA	C, D	L-PEPTIDE LINKING	C4 H9 N O2		ALA
DTY	C, D	D-PEPTIDE LINKING	C9 H11 N O3		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.72 Å
• R-Value Free:  0.200 (Depositor), 0.211 (DCC) 
• R-Value Work:  0.183 (Depositor) 
• R-Value Observed: 0.184 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.21	α = 90
b = 98.637	β = 107.821
c = 59.136	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-04-23 
Deposition Author(s): Afsar, M., Priscila, B., Olsen, S.K.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM115568
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM128731
Cancer Prevention and Research Institute of Texas (CPRIT)	United States	RR200030

Revision History  

• Version 1.0: 2025-04-23
  Type: Initial release