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Yorodumi- EMDB-71550: Structure of beta-1,3-glucan synthase in complex with caspofungin... -
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Basic information
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| Title | Structure of beta-1,3-glucan synthase in complex with caspofungin, Rho1 and long glucan | |||||||||
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Keywords | Enzyme / glucan synthesis / MEMBRANE PROTEIN | |||||||||
| Function / homology | Function and homology informationregulation of secondary cell septum biogenesis / PI3K/AKT activation / G beta:gamma signalling through PI3Kgamma / RHO GTPases activate PKNs / RND3 GTPase cycle / cellular bud neck septin ring organization / G alpha (12/13) signalling events / RHOF GTPase cycle / RND1 GTPase cycle / positive regulation of mitotic actomyosin contractile ring assembly ...regulation of secondary cell septum biogenesis / PI3K/AKT activation / G beta:gamma signalling through PI3Kgamma / RHO GTPases activate PKNs / RND3 GTPase cycle / cellular bud neck septin ring organization / G alpha (12/13) signalling events / RHOF GTPase cycle / RND1 GTPase cycle / positive regulation of mitotic actomyosin contractile ring assembly / regulation of cell wall (1->3)-beta-D-glucan biosynthetic process / regulation of exocyst localization / : / RND2 GTPase cycle / budding cell bud growth / RHOC GTPase cycle / regulation of fungal-type cell wall organization / spore wall / fungal-type cell wall polysaccharide biosynthetic process / 1,3-beta-glucan synthase / 1,3-beta-D-glucan synthase activity / regulation of vacuole fusion, non-autophagic / (1->3)-beta-D-glucan biosynthetic process / : / 1,3-beta-D-glucan synthase complex / RHOA GTPase cycle / fungal-type cell wall biogenesis / cellular bud / ascospore wall assembly / incipient cellular bud site / actin cortical patch / cellular bud tip / fungal-type cell wall / cellular bud neck / mating projection tip / fungal-type vacuole membrane / peroxisomal membrane / regulation of cell size / small GTPase-mediated signal transduction / positive regulation of endocytosis / Neutrophil degranulation / small monomeric GTPase / actin filament organization / cell periphery / regulation of actin cytoskeleton organization / enzyme activator activity / peroxisome / regulation of protein localization / G-protein beta-subunit binding / actin cytoskeleton organization / G protein activity / mitochondrial outer membrane / endosome membrane / GTPase activity / protein kinase binding / GTP binding / endoplasmic reticulum / Golgi apparatus / signal transduction / mitochondrion / membrane / plasma membrane / cytosol Similarity search - Function | |||||||||
| Biological species | ![]() | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.09 Å | |||||||||
Authors | Ren Z / Lee SY | |||||||||
| Funding support | United States, 1 items
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Citation | Journal: Nature / Year: 2026Title: Structural basis of fungal β-1,3-glucan synthase inhibition by caspofungin. Authors: Zhenning Ren / Abhishek Chhetri / Chang Liu / ShuYu Offner / Kedar Sharma / Mario J Borgnia / Wonpil Im / Kenichi Yokoyama / Seok-Yong Lee / ![]() Abstract: Invasive fungal infections pose life-threatening risks to the increasing population of immunocompromised patients. Treatment remains challenging due to limited antifungal drugs and increasing ...Invasive fungal infections pose life-threatening risks to the increasing population of immunocompromised patients. Treatment remains challenging due to limited antifungal drugs and increasing resistance. β-1,3-D-glucan synthase (GS), comprising the catalytic Fks1 and the regulatory small GTPase, Rho1 (refs. ), is the target of clinically important echinocandin antifungals. Despite recent studies, the mechanisms of GS catalysis, Rho1 regulation and echinocandin inhibition and resistance remain elusive. Here we present cryo-electron microscopy structures of native Saccharomyces cerevisiae Fks1 (ScFks1) solved under catalytically relevant conditions, revealing its interactions with the antifungal caspofungin (CFN), glucan product from the translocation channel and Rho1. CFN forms a ternary complex with nascent glucan and Fks1 at the membrane-protein interface, suggesting an unexpected role of CFN in stalling polymer translocation. Our echinocandin-resistant S643P structure suggests a resistance mechanism: the substitution destabilizes CFN and glucan binding through both allosteric structural perturbation and direct steric clash. Rho1 binding induces active site rearrangements essential for catalysis, including that of the 'latch loop' for donor substrate coordination. Furthermore, we identify YMR295C as an auxiliary subunit. These findings elucidate the mechanisms of GS-mediated glucan synthesis and its inhibition and resistance by echinocandins, laying the groundwork for rational antifungal design. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_71550.map.gz | 63.9 MB | EMDB map data format | |
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| Header (meta data) | emd-71550-v30.xml emd-71550.xml | 24.4 KB 24.4 KB | Display Display | EMDB header |
| Images | emd_71550.png | 116.5 KB | ||
| Masks | emd_71550_msk_1.map | 125 MB | Mask map | |
| Filedesc metadata | emd-71550.cif.gz | 8.7 KB | ||
| Others | emd_71550_half_map_1.map.gz emd_71550_half_map_2.map.gz | 115.9 MB 115.9 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-71550 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-71550 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9pe1MC ![]() 9pe2C ![]() 9pe3C ![]() 9pe4C ![]() 9pe5C ![]() 9ztcC M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_71550.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.84 Å | ||||||||||||||||||||||||||||||||||||
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Mask #1
| File | emd_71550_msk_1.map | ||||||||||||
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-Half map: #1
| File | emd_71550_half_map_1.map | ||||||||||||
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-Half map: #2
| File | emd_71550_half_map_2.map | ||||||||||||
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Sample components
+Entire : Structure of beta-1,3-glucan synthase from Saccharomyces cerevisi...
+Supramolecule #1: Structure of beta-1,3-glucan synthase from Saccharomyces cerevisi...
+Macromolecule #1: 1,3-beta-glucan synthase component FKS1
+Macromolecule #2: GTP-binding protein RHO1
+Macromolecule #3: Gsr1p
+Macromolecule #4: Caspofungin
+Macromolecule #7: 2-acetamido-2-deoxy-beta-D-glucopyranose
+Macromolecule #8: CHOLESTEROL HEMISUCCINATE
+Macromolecule #9: 1,2-Distearoyl-sn-glycerophosphoethanolamine
+Macromolecule #10: URIDINE-5'-DIPHOSPHATE
+Macromolecule #11: 5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE
+Macromolecule #12: (10R,12S)-10,12-dimethyltetradecanoic acid
+Macromolecule #13: water
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 7.5 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.8 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Keywords
Authors
United States, 1 items
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Processing
FIELD EMISSION GUN
