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- PDB-8jzn: Structure of a fungal 1,3-beta-glucan synthase -

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Basic information

Entry
Database: PDB / ID: 8jzn
TitleStructure of a fungal 1,3-beta-glucan synthase
Components1,3-beta-glucan synthase component FKS1
KeywordsTRANSFERASE / fungi / drug target
Function / homology
Function and homology information


fungal-type cell wall polysaccharide biosynthetic process / 1,3-beta-glucan synthase / 1,3-beta-D-glucan synthase activity / (1->3)-beta-D-glucan biosynthetic process / 1,3-beta-D-glucan synthase complex / fungal-type cell wall biogenesis / cellular bud / ascospore wall assembly / actin cortical patch / cellular bud tip ...fungal-type cell wall polysaccharide biosynthetic process / 1,3-beta-glucan synthase / 1,3-beta-D-glucan synthase activity / (1->3)-beta-D-glucan biosynthetic process / 1,3-beta-D-glucan synthase complex / fungal-type cell wall biogenesis / cellular bud / ascospore wall assembly / actin cortical patch / cellular bud tip / fungal-type cell wall / cellular bud neck / regulation of cell size / positive regulation of endocytosis / cell periphery / mitochondrion / plasma membrane
Similarity search - Function
: / 1,3-beta-glucan synthase component FKS1, second domain / Glycosyl transferase, family 48 / 1,3-beta-glucan synthase subunit FKS1-like, domain-1 / 1,3-beta-glucan synthase component / 1,3-beta-glucan synthase subunit FKS1, domain-1 / 1,3-beta-glucan synthase subunit FKS1
Similarity search - Domain/homology
Lauryl Maltose Neopentyl Glycol / ERGOSTEROL / Chem-POV / 1,3-beta-glucan synthase component FKS1
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.47 Å
AuthorsZhao, C. / You, Z. / Chen, D. / Hang, J. / Wang, Z. / Meng, J. / Wang, L. / Zhao, P. / Qiao, J. / Yun, C. / Bai, L.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32171212 China
CitationJournal: Sci Adv / Year: 2023
Title: Structure of a fungal 1,3-β-glucan synthase.
Authors: Chao-Ran Zhao / Zi-Long You / Dan-Dan Chen / Jing Hang / Zhao-Bin Wang / Meng Ji / Le-Xuan Wang / Peng Zhao / Jie Qiao / Cai-Hong Yun / Lin Bai /
Abstract: 1,3-β-Glucan serves as the primary component of the fungal cell wall and is produced by 1,3-β-glucan synthase located in the plasma membrane. This synthase is a molecular target for antifungal ...1,3-β-Glucan serves as the primary component of the fungal cell wall and is produced by 1,3-β-glucan synthase located in the plasma membrane. This synthase is a molecular target for antifungal drugs such as echinocandins and the triterpenoid ibrexafungerp. In this study, we present the cryo-electron microscopy structure of 1,3-β-glucan synthase (Fks1) at 2.47-Å resolution. The structure reveals a central catalytic region adopting a cellulose synthase fold with a cytosolic conserved GT-A-type glycosyltransferase domain and a closed transmembrane channel responsible for glucan transportation. Two extracellular disulfide bonds are found to be crucial for Fks1 enzymatic activity. Through structural comparative analysis with cellulose synthases and structure-guided mutagenesis studies, we gain previously unknown insights into the molecular mechanisms of fungal 1,3-β-glucan synthase.
History
DepositionJul 5, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Oct 4, 2023Provider: repository / Type: Initial release
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Revision 1.2Nov 13, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
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Revision 1.3Jun 25, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 25, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: 1,3-beta-glucan synthase component FKS1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)224,58420
Polymers215,0761
Non-polymers9,50819
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein 1,3-beta-glucan synthase component FKS1 / 1 / 3-beta-D-glucan-UDP glucosyltransferase / Calcineurin dependent protein 1 / Calcofluor white ...1 / 3-beta-D-glucan-UDP glucosyltransferase / Calcineurin dependent protein 1 / Calcofluor white hypersensitivity protein 53 / Echinocandin target gene protein 1 / FK506 sensitivity protein 1 / Glucan synthase of cerevisiae protein 1 / Papulacandin B resistance protein 1


Mass: 215076.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: FKS1, CND1, CWH53, ETG1, GLS1, GSC1, PBR1, YLR342W, L8300.6
Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P38631, 1,3-beta-glucan synthase
#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#3: Chemical ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC


Mass: 760.076 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C42H82NO8P / Feature type: SUBJECT OF INVESTIGATION / Comment: phospholipid*YM
#4: Chemical ChemComp-AV0 / Lauryl Maltose Neopentyl Glycol / 2,2-didecylpropane-1,3-bis-b-D-maltopyranoside / 2-decyl-2-{[(4-O-alpha-D-glucopyranosyl-beta-D-glucopyranosyl)oxy]methyl}dodecyl4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside


Mass: 1005.188 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C47H88O22
#5: Chemical
ChemComp-ERG / ERGOSTEROL


Mass: 396.648 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: C28H44O
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Fks1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 215 kDa/nm / Experimental value: YES
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Source (recombinant)Organism: Saccharomyces cerevisiae (brewer's yeast)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 1.6 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 2.47 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1077552 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00613299
ELECTRON MICROSCOPYf_angle_d0.74818128
ELECTRON MICROSCOPYf_dihedral_angle_d16.161922
ELECTRON MICROSCOPYf_chiral_restr0.0472048
ELECTRON MICROSCOPYf_plane_restr0.0052150

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