9P6Q | pdb_00009p6q

Mouse Ketohexokinase-A without ligand

PDB DOI: https://doi.org/10.2210/pdb9P6Q/pdb

Classification: TRANSFERASE
Organism(s): Mus musculus
Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
Mutation(s): No

Deposited: 2025-06-19 Released: 2025-11-12
Deposition Author(s): Bae, S., Allen, K.N., Tolan, D.R.
Funding Organization(s): National Institutes of Health/National Institute on Alcohol Abuse and Alcoholism (NIH/NIAAA)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.37 Å
R-Value Free:
0.188 (Depositor), 0.211 (DCC)
R-Value Work:
0.149 (Depositor)
R-Value Observed:
0.151 (Depositor)

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

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

Literature

Conformational changes in ketohexokinase are conserved across isozymes and species.

Bae, S.Y., Allen, K.N., Tolan, D.R.

(2025) Acta Crystallogr F Struct Biol Commun 81: 451-458

PubMed: 41070915 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1107/S2053230X25008428
Primary Citation Related Structures:
9P6Q

PubMed Abstract:
Ketohexokinase (KHK) catalyses the initial step in fructose metabolism, converting the furanose form of D-fructose to fructose 1-phosphate in an ATP-dependent reaction. Given its central role in metabolic pathways, KHK has emerged as a target for pharmacological intervention in the treatment of non-alcoholic fatty liver disease, metabolic syndrome, type 2 diabetes and obesity. KHK exists as two isoforms, A and C, which arise from alternative splicing of exon 3, resulting in a differing 45-amino-acid sequence within the 298-amino-acid primary structure of the enzyme. KHK is a biological homodimer, with each subunit adopting an α/β-fold architecture that interlocks with a β-clasp domain. In the case of KHK-C at least two distinct conformations of the β-clasp domain have been identified, whereas this conformational flexibility had not been observed in KHK-A. Here, X-ray crystallographic structural investigations of unliganded murine KHK-A refined to 1.37 Å resolution revealed the adoption of two conformations similar to those adopted by the human ortholog, suggesting that this structural feature is conserved across species. The functional significance of these conformational changes in KHK-A is of particular interest as this isoform has been implicated in cancer metastasis through a `moonlighting' protein kinase activity. Understanding the mechanistic role of conformational shifts in KHK-A may provide insights into its broader physiological functions and therapeutic potential.

Organizational Affiliation