9BTF | pdb_00009btf

Structure of the SARS-CoV-2 main protease in complex with inhibitor SR-B-77

PDB DOI: https://doi.org/10.2210/pdb9BTF/pdb

Classification: VIRAL PROTEIN, Hydrolase
Organism(s): Severe acute respiratory syndrome coronavirus 2
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2024-05-15 Released: 2025-05-21
Deposition Author(s): Blankenship, L.R., Liu, W.R.
Funding Organization(s): Welch Foundation

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.80 Å
R-Value Free:
0.224 (Depositor), 0.224 (DCC)
R-Value Work:
0.198 (Depositor), 0.198 (DCC)
R-Value Observed:
0.199 (Depositor)

Starting Model: experimental
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Ligand Structure Quality Assessment

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Literature

Structure of the SARS-CoV-2 main protease

Blankenship, L.R., Liu, W.R.

To be published.

Macromolecule Content

Total Structure Weight: 34.33 kDa
Atom Count: 2,687
Modeled Residue Count: 306
Deposited Residue Count: 306
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase nsp5	A	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 Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0DTD1
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
A1ASH (Subject of Investigation/LOI) Query on A1ASH Download:Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A] mmCIF format, chain B [auth A]	B [auth A]	(1R,2S,5S)-N-[(1R)-1-(5-fluoropyridin-3-yl)-2-iminoethyl]-6,6-dimethyl-3-[3-methyl-N-(trifluoroacetyl)-L-valyl]-3-azabicyclo[3.1.0]hexane-2-carboxamide C₂₃ H₂₉ F₄ N₅ O₃ MTZVAELPSBTCAH-CWJTTXGOSA-N		Interactions Focus chain B [auth A] Interactions & Density Focus chain B [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.80 Å
R-Value Free: 0.224 (Depositor), 0.224 (DCC)
R-Value Work: 0.198 (Depositor), 0.198 (DCC)
R-Value Observed: 0.199 (Depositor)

Space Group: I 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.964	α = 90
b = 79.51	β = 96.976
c = 88.888	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PDB_EXTRACT	data extraction
PROTEUM PLUS	data reduction
Aimless	data scaling
PHENIX	phasing

Structure Validation

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Ligand Structure Quality Assessment

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Entry History

& Funding Information

Deposition Data

Released Date: 2025-05-21

Deposition Author(s):

Blankenship, L.R.

Funding Organization	Location	Grant Number
Welch Foundation	United States	--

Revision History (Full details and data files)

Version 1.0: 2025-05-21
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.