9H4B | pdb_00009h4b

Crystal structure of SARS-CoV-2 Mpro in complex with GK-730

PDB DOI: https://doi.org/10.2210/pdb9H4B/pdb

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

Deposited: 2024-10-18 Released: 2025-10-29
Deposition Author(s): El Kilani, H., Hilgenfeld, R.
Funding Organization(s): European Commission

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.90 Å
R-Value Free:
0.231 (Depositor), 0.241 (DCC)
R-Value Work:
0.172 (Depositor), 0.185 (DCC)

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.0 of the entry. See complete history.

Literature

Crystal structure of SARS-CoV-2 Mpro in complex with GK-730

El Kilani, H., Hilgenfeld, R.

To be published.

Macromolecule Content

Total Structure Weight: 34.47 kDa
Atom Count: 2,551
Modeled Residue Count: 306
Deposited Residue Count: 306
Unique protein chains: 1

Macromolecules

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(by identity cutoff) | 3D Structure

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% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P0DTD1
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
A1ISK (Subject of Investigation/LOI) Query on A1ISK 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]	methyl 2-[(1S,2S)-2-[[(2S)-4-methyl-2-[[(2S)-3-methyl-2-(phenylmethoxycarbonylamino)butanoyl]amino]pentanoyl]amino]-1-oxidanyl-3-[(3S)-2-oxidanylidenepyrrolidin-3-yl]propyl]-1,3-thiazole-4-carboxylate C₃₁ H₄₃ N₅ O₈ S VXGLAHXNQFYSAB-ZLCZASCPSA-N		Interactions Focus chain B [auth A] Interactions & Density Focus chain B [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.90 Å
R-Value Free: 0.231 (Depositor), 0.241 (DCC)
R-Value Work: 0.172 (Depositor), 0.185 (DCC)

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 115.777	α = 90
b = 52.896	β = 98.94
c = 45.648	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
Aimless	data scaling
MOLREP	phasing

Structure Validation

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Ligand Structure Quality Assessment

Entry History & Funding Information

Deposition Data

Released Date: 2025-10-29

Deposition Author(s):

Funding Organization	Location	Grant Number
European Commission	European Union	--

Revision History (Full details and data files)

Version 1.0: 2025-10-29
Type: Initial release

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.