Mechanistic Basis for 5-HT(2A)R Over 5-HT(2B)R Activation.

Selective activation of 5-HT(2A) receptors over 5-HT(2B) receptors was achieved with derivatives showing high specificity, confirmed by cryo-EM structures.

• Why it matters: Avoiding 5-HT(2B) receptor activation is crucial to prevent side effects in psychedelic-inspired therapies, highlighting the need for receptor-selective drugs.
• What they did: Researchers analyzed ligand-binding pockets of both receptors, identifying structural constraints, then designed derivatives targeting these features, and confirmed their binding modes with cryo-EM.
• The result: The study provides a rational framework for creating safer serotonergic compounds that selectively activate 5-HT(2A) receptors, reducing adverse effects while maintaining therapeutic benefits.