35WK | pdb_000035wk

Crystal structure of the core catalytic domain of human inositol phosphate multikinase in complex with an inhibitor UNC7844

• PDB DOI: https://doi.org/10.2210/pdb35WK/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2026-05-20 Released: 2026-09-23 
• Deposition Author(s): Wang, H.
• Funding Organization(s): National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 
  0.256 (Depositor), 0.267 (DCC) 
• R-Value Work: 
  0.216 (Depositor), 0.230 (DCC) 

Starting Model: experimental

Literature

Host soluble inositol phosphate signaling promotes coronavirus replication.

Shats, I., Wang, H., Zhou, Y., Gu, C., Carr, A., Guardia, C.M., Shears, S., Stanley, R., Zhang, Q., Blind, R.D., Wang, X., Li, X.

(2026) bioRxiv 

• PubMed: 42779723 
• DOI: https://doi.org/10.64898/2026.09.12.751050
• Primary Citation Related Structures: 
  35WJ, 35WK


• PubMed Abstract: 
  

  Coronaviruses rely extensively on host pathways for replication, making host-directed therapies an attractive strategy for broad-spectrum antivirals with reduced risk of viral resistance. Here we identify the host soluble inositol phosphate pathway as a previously unrecognized dependency for coronavirus infection. Genetic or pharmacologic inhibition of several kinases in this pathway markedly suppresses replication of both alpha- and betacoronaviruses, while increasing pathway activity promotes viral replication. We developed UNC7844, a potent multi-target inhibitor of these kinases, which reduces coronavirus replication by more than four orders of magnitude in cultured cells and suppresses coronavirus infection in mice. Mechanistically, UNC7844 suppresses inositol (pyro)phosphates production, disrupts phosphoinositide homeostasis, and impairs late endosomal dynamics, blocking early post-entry steps required for viral genome release and replication. Together, our findings establish the soluble inositol (pyro)phosphate pathway as an important regulator of coronavirus infection and highlight its inhibition as a promising host-directed antiviral strategy.

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Organizational Affiliation: 
• Molecular and Cell Biology Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA.
Center for Integrative Chemical Biology and Drug Discovery, Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Reproductive and Developmental Biology Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA.
Department of Medicine, Division of Diabetes, Endocrinology and Metabolism, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 30.17 kDa 
• Atom Count: 2,161 
• Modeled Residue Count: 239 
• Deposited Residue Count: 261 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Inositol polyphosphate multikinase	A	261	Homo sapiens	Mutation(s): 0  Gene Names: IPMK, IMPK EC: 2.7.1.140 (PDB Primary Data), 2.7.1.151 (PDB Primary Data), 2.7.1.153 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NFU5 (Homo sapiens) Explore Q8NFU5  Go to UniProtKB:  Q8NFU5
PHAROS:  Q8NFU5 GTEx:  ENSG00000151151

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A1DH6 (Subject of Investigation/LOI)	B [auth A]	(5P)-3-([1,1'-biphenyl]-4-yl)-5-(1H-tetrazol-5-yl)-2,1-benzoxazole C20 H13 N5 O GTHOGQSUCPFPPL-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free:  0.256 (Depositor), 0.267 (DCC) 
• R-Value Work:  0.216 (Depositor), 0.230 (DCC) 

Space Group: P 4₂ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 78.238	α = 90
b = 78.238	β = 90
c = 85.008	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-09-23 
Deposition Author(s): Wang, H.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)	United States	1ZIAES103340

Revision History  

• Version 1.0: 2026-09-23
  Type: Initial release
  
• Version 1.1: 2026-10-07
  Changes: Database references