National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM082251
米国
The Francis Crick Institute
FC001061
英国
引用
ジャーナル: Science / 年: 2020 タイトル: Structural basis of second-generation HIV integrase inhibitor action and viral resistance. 著者: Nicola J Cook / Wen Li / Dénes Berta / Magd Badaoui / Allison Ballandras-Colas / Andrea Nans / Abhay Kotecha / Edina Rosta / Alan N Engelman / Peter Cherepanov / 要旨: Although second-generation HIV integrase strand-transfer inhibitors (INSTIs) are prescribed throughout the world, the mechanistic basis for the superiority of these drugs is poorly understood. We ...Although second-generation HIV integrase strand-transfer inhibitors (INSTIs) are prescribed throughout the world, the mechanistic basis for the superiority of these drugs is poorly understood. We used single-particle cryo-electron microscopy to visualize the mode of action of the advanced INSTIs dolutegravir and bictegravir at near-atomic resolution. Glutamine-148→histidine (Q148H) and glycine-140→serine (G140S) amino acid substitutions in integrase that result in clinical INSTI failure perturb optimal magnesium ion coordination in the enzyme active site. The expanded chemical scaffolds of second-generation compounds mediate interactions with the protein backbone that are critical for antagonizing viruses containing the Q148H and G140S mutations. Our results reveal that binding to magnesium ions underpins a fundamental weakness of the INSTI pharmacophore that is exploited by the virus to engender resistance and provide a structural framework for the development of this class of anti-HIV/AIDS therapeutics.