Molecular Insights into Fungal Glycosylphosphatidylinositol Transamidase Complex.

ABSTRACT: The glycosylphosphatidylinositol (GPI) biosynthesis pathway is critical for antifungal drug development. As a key component of this pathway, GPI transamidase (GPIT) catalyzes the attachment of GPI anchors to proteins, a process essential for fungal cell wall integrity and virulence. Despite its biological significance, structural and mechanistic insights into fungal GPIT remain limited. Here, a series of cryo-electron microscopy structures capturing distinct functional states of Saccharomyces cerevisiae GPIT is reported, including GPIT complexed with a GPI anchor, GPIT bound to a substrate-mimetic peptide, and an unprecedented dimeric GPIT assembly. These structures reveal the conserved GPI anchor binding site formed by Gab1 and Gpi16, as well as a key protein substrate recognition site, G

SUBMITTER: Hua Z 

PROVIDER: S-EPMC12786357 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature