9N98 | pdb_00009n98

Main Protease of HKU4 in complex with AVI-8122

PDB DOI: https://doi.org/10.2210/pdb9N98/pdb

Classification: VIRUS
Organism(s): Tylonycteris bat coronavirus HKU4
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 2025-02-10 Released: 2026-02-18
Deposition Author(s): Chen, P., Lu, J., Lemieux, M.J.
Funding Organization(s): Canadian Institutes of Health Research (CIHR)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.05 Å
R-Value Free:
0.242 (Depositor), 0.242 (DCC)
R-Value Work:
0.206 (Depositor), 0.206 (DCC)
R-Value Observed:
0.208 (Depositor)

Starting Model: experimental
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Ligand Structure Quality Assessment

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Literature

Identification of Inhibitors Broadly Against Main Proteases of coronavirus

Chen, P., Lu, J., Lemieux, M.J.

To be published.

Macromolecule Content

Total Structure Weight: 67.39 kDa
Atom Count: 4,842
Modeled Residue Count: 597
Deposited Residue Count: 612
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase	A [auth B], B [auth A]	306	Tylonycteris bat coronavirus HKU4	Mutation(s): 0 Gene Names: rep, 1a-1b EC: 3.4.22
UniProt
Find proteins for P0C6W3 (Bat coronavirus HKU4) Explore P0C6W3 Go to UniProtKB: P0C6W3
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0C6W3
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
A1BWH (Subject of Investigation/LOI) Query on A1BWH Download:Ideal Coordinates CCD File SDF format, chain C [auth B] SDF format, chain D [auth A] MOL2 format, chain C [auth B] MOL2 format, chain D [auth A] mmCIF format, chain C [auth B] mmCIF format, chain D [auth A]	C [auth B], D [auth A]	N-[(2S)-3-cyclopropyl-1-({(2S,3S)-3,4-dihydroxy-1-[(3S)-2-oxopiperidin-3-yl]butan-2-yl}amino)-1-oxopropan-2-yl]-7-fluoro-1H-indole-2-carboxamide C₂₄ H₃₁ F N₄ O₅ SXZDNPUJTOHKJI-TXJVSEOTSA-N		Interactions Focus chain C [auth B] Focus chain D [auth A] Interactions & Density Focus chain C [auth B] Focus chain D [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.05 Å
R-Value Free: 0.242 (Depositor), 0.242 (DCC)
R-Value Work: 0.206 (Depositor), 0.206 (DCC)
R-Value Observed: 0.208 (Depositor)

Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.88	α = 111.21
b = 58.08	β = 99.57
c = 64.87	γ = 109.92

Software Package:

Software Name	Purpose
PHENIX	refinement
SCALA	data scaling
XDS	data reduction
PHENIX	phasing

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-02-18

Deposition Author(s):

Funding Organization	Location	Grant Number
Canadian Institutes of Health Research (CIHR)	Canada	--

Revision History (Full details and data files)

Version 1.0: 2026-02-18
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.