Orthosteric-allosteric dual inhibitors of PfHT1 as selective antimalarial agents.

TitleOrthosteric-allosteric dual inhibitors of PfHT1 as selective antimalarial agents.
Publication TypeJournal Article
Year of Publication2021
AuthorsHuang, J, Yuan, Y, Zhao, N, Pu, D, Tang, Q, Zhang, S, Luo, S, Yang, X, Wang, N, Xiao, Y, Zhang, T, Liu, Z, Sakata-Kato, T, Jiang, X, Kato, N, Yan, N, Yin, H
JournalProc Natl Acad Sci U S A
Volume118
Issue3
Date Published2021 01 19
ISSN1091-6490
KeywordsAllosteric Site, Amino Acid Sequence, Animals, Antimalarials, Crystallography, X-Ray, Glucose, Glucose Transporter Type 1, Glucose Transporter Type 3, Malaria, Falciparum, Monosaccharide Transport Proteins, Plasmodium falciparum, Protein Conformation, Protozoan Proteins, Structure-Activity Relationship
Abstract

<p>Artemisinin-resistant malaria parasites have emerged and have been spreading, posing a significant public health challenge. Antimalarial drugs with novel mechanisms of action are therefore urgently needed. In this report, we exploit a "selective starvation" strategy by inhibiting hexose transporter 1 (PfHT1), the sole hexose transporter in , over human glucose transporter 1 (hGLUT1), providing an alternative approach to fight against multidrug-resistant malaria parasites. The crystal structure of hGLUT3, which shares 80% sequence similarity with hGLUT1, was resolved in complex with C3361, a moderate PfHT1-specific inhibitor, at 2.3-Å resolution. Structural comparison between the present hGLUT3-C3361 and our previously reported PfHT1-C3361 confirmed the unique inhibitor binding-induced pocket in PfHT1. We then designed small molecules to simultaneously block the orthosteric and allosteric pockets of PfHT1. Through extensive structure-activity relationship studies, the TH-PF series was identified to selectively inhibit PfHT1 over hGLUT1 and potent against multiple strains of the blood-stage Our findings shed light on the next-generation chemotherapeutics with a paradigm-shifting structure-based design strategy to simultaneously target the orthosteric and allosteric sites of a transporter.</p>

DOI10.1073/pnas.2017749118
Alternate JournalProc Natl Acad Sci U S A
PubMed ID33402433
PubMed Central IDPMC7826358