Clustering of host N-glycans by the microneme MIC1/4/6 complex licenses Toxoplasma rhoptry discharge.

Clustering of host N-glycans by MIC1/4/6 complex enables Toxoplasma gondii rhoptry discharge, a critical step in host cell invasion.

• Why it matters: Understanding how Toxoplasma recognizes and interacts with host cells is essential for developing targeted interventions against toxoplasmosis, yet these host-parasite interactions remain poorly understood.
• What they did: A genome-wide host cell screen identified host N-glycosylation and cholesterol biosynthesis as key pathways for rhoptry discharge; the MIC1/4/6 complex binds host N-glycans and clusters proteins in a cholesterol-dependent manner.
• The result: Disrupting host cholesterol or competing with glycans inhibits clustering and rhoptry discharge, revealing a new invasion step and potential targets for therapeutic intervention.