7ZSP image
Entry Detail
PDB ID:
7ZSP
Keywords:
Title:
human purine nucleoside phosphorylase in complex with JS-555
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-05-08
Release Date:
2023-05-17
Method Details:
Experimental Method:
Resolution:
2.29 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
H 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Purine nucleoside phosphorylase
Chain IDs:A
Chain Length:289
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Design, Synthesis, Biological Evaluation, and Crystallographic Study of Novel Purine Nucleoside Phosphorylase Inhibitors.
J.Med.Chem. 66 6652 6681 (2023)
PMID: 37134237 DOI: 10.1021/acs.jmedchem.2c02097

Abstact

Purine nucleoside phosphorylase (PNP) is a well-known molecular target with potential therapeutic applications in the treatment of T-cell malignancies and/or bacterial/parasitic infections. Here, we report the design, development of synthetic methodology, and biological evaluation of a series of 30 novel PNP inhibitors based on acyclic nucleoside phosphonates bearing a 9-deazahypoxanthine nucleobase. The strongest inhibitors exhibited IC50 values as low as 19 nM (human PNP) and 4 nM (Mycobacterium tuberculosis (Mt) PNP) and highly selective cytotoxicity toward various T-lymphoblastic cell lines with CC50 values as low as 9 nM. No cytotoxic effect was observed on other cancer cell lines (HeLa S3, HL60, HepG2) or primary PBMCs for up to 10 μM. We report the first example of the PNP inhibitor exhibiting over 60-fold selectivity for the pathogenic enzyme (MtPNP) over hPNP. The results are supported by a crystallographic study of eight enzyme-inhibitor complexes and by ADMET profiling in vitro and in vivo.

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