9MCL | pdb_00009mcl

Crystal structure of SARS-Cov-2 main protease K90R mutant in complex with Leritrelvir

PDB DOI: https://doi.org/10.2210/pdb9MCL/pdb

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

Deposited: 2025-03-17 Released: 2026-03-25
Deposition Author(s): Li, W.W., Li, J.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.10 Å
R-Value Free:
0.229 (Depositor), 0.229 (DCC)
R-Value Work:
0.185 (Depositor), 0.185 (DCC)
R-Value Observed:
0.187 (Depositor)

Starting Model: experimental
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Ligand Structure Quality Assessment

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Literature

Crystal structure of SARS-Cov-2 main protease K90R mutant in complex with Leritrelvir

Li, W.W., Li, J.

To be published.

Macromolecule Content

Total Structure Weight: 67.75 kDa
Atom Count: 4,893
Modeled Residue Count: 598
Deposited Residue Count: 600
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3C-like proteinase nsp5	A, B	300	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 1 EC: 3.4.22.69
UniProt
Find proteins for P0DTC1 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTC1 Go to UniProtKB: P0DTC1
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0DTC1
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
A1EN0 (Subject of Investigation/LOI) Query on A1EN0 Download:Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain D [auth B] MOL2 format, chain C [auth A] MOL2 format, chain D [auth B] mmCIF format, chain C [auth A] mmCIF format, chain D [auth B]	C [auth A], D [auth B]	(3~{S},3~{a}~{S},6~{a}~{R})-2-[(2~{S})-2-cyclohexyl-2-[2,2,2-tris(fluoranyl)ethanoylamino]ethanoyl]-~{N}-[(2~{S})-4-(cyclopentylamino)-3,4-bis(oxidanylidene)-1-[(3~{S})-2-oxidanylidenepyrrolidin-3-yl]butan-2-yl]-3,3~{a},4,5,6,6~{a}-hexahydro-1~{H}-cyclopenta[c]pyrrole-3-carboxamide C₃₁ H₄₄ F₃ N₅ O₆ ICGMMLTUQDVAST-HEZDJTGRSA-N		Interactions Focus chain C [auth A] Focus chain D [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth B]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.10 Å
R-Value Free: 0.229 (Depositor), 0.229 (DCC)
R-Value Work: 0.185 (Depositor), 0.185 (DCC)
R-Value Observed: 0.187 (Depositor)

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.84	α = 90
b = 99.4	β = 108.802
c = 59.88	γ = 90

Software Package:

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

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-03-25

Deposition Author(s):

Funding Organization	Location	Grant Number
Not funded		--

Revision History (Full details and data files)

Version 1.0: 2026-03-25
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.