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Echinocandin drugs have become a front-line therapy against Candida spp. infections due to the increased incidence of infections by species with elevated azole resistance, such as Candida glabrata. Echinocandins target the fungal-specific enzyme ß-(1,3)-glucan synthase (GS), which is located in the plasma membrane and catalyzes the biosynthesis of ß-(1,3)-glucan, the major component of the fungal cell wall. However, resistance to echinocandin drugs, which results from hotspot mutations in the catalytic subunits of GS, is an emerging problem. Little structural information on GS is currently available because, thus far, the GS enzyme complex has resisted homogenous purification, limiting our understanding of GS as a major biosynthetic apparatus for cell wall assembly and an important therapeutic drug target. Here, by applying cryo-electron tomography (cryo-ET) and subtomogram analysis, we provide a preliminary structure of the putative C. glabrata GS complex as clusters of hexamers, each subunit with two notable cytosolic domains, the N-terminal and central catalytic domains. This study lays the foundation for structural and functional studies of this elusive protein complex, which will provide insight into fungal cell wall synthesis and the development of more efficacious antifungal therapeutics.
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