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- PDB-7zlh: Cryo-EM structure of C-mannosyltransferase CeDPY19, in apo state,... -

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Basic information

Entry
Database: PDB / ID: 7zlh
TitleCryo-EM structure of C-mannosyltransferase CeDPY19, in apo state, bound to CMT2-Fab and anti-Fab nanobody
Components
  • Anti-Fab nanobody
  • C-mannosyltransferase dpy-19
  • CMT2-Fab heavy chain
  • CMT2-Fab light chain
KeywordsMEMBRANE PROTEIN / C-mannosyltransferase
Function / homology
Function and homology information


: / mannosyltransferase activity / Transferases; Glycosyltransferases; Hexosyltransferases / nervous system development / carbohydrate metabolic process / cell differentiation / endoplasmic reticulum membrane / perinuclear region of cytoplasm / cytoplasm
Similarity search - Function
Dpy-19/Dpy-19-like / : / Q-cell neuroblast polarisation / Glycoside hydrolase/deacetylase, beta/alpha-barrel / Immunoglobulins / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
C-mannosyltransferase dpy-19
Similarity search - Component
Biological speciessynthetic construct (others)
Caenorhabditis elegans (invertebrata)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.75 Å
AuthorsBloch, J.S. / Mukherjee, S. / Irobalieva, R. / Kossiakoff, A.A. / Goddard-Borger, E.D. / Locher, K.P.
Funding support Switzerland, 1items
OrganizationGrant numberCountry
Swiss National Science Foundation Switzerland
CitationJournal: Nat Chem Biol / Year: 2023
Title: Structure, sequon recognition and mechanism of tryptophan C-mannosyltransferase.
Authors: Joël S Bloch / Alan John / Runyu Mao / Somnath Mukherjee / Jérémy Boilevin / Rossitza N Irobalieva / Tamis Darbre / Nichollas E Scott / Jean-Louis Reymond / Anthony A Kossiakoff / Ethan D ...Authors: Joël S Bloch / Alan John / Runyu Mao / Somnath Mukherjee / Jérémy Boilevin / Rossitza N Irobalieva / Tamis Darbre / Nichollas E Scott / Jean-Louis Reymond / Anthony A Kossiakoff / Ethan D Goddard-Borger / Kaspar P Locher /
Abstract: C-linked glycosylation is essential for the trafficking, folding and function of secretory and transmembrane proteins involved in cellular communication processes. The tryptophan C- ...C-linked glycosylation is essential for the trafficking, folding and function of secretory and transmembrane proteins involved in cellular communication processes. The tryptophan C-mannosyltransferase (CMT) enzymes that install the modification attach a mannose to the first tryptophan of WxxW/C sequons in nascent polypeptide chains by an unknown mechanism. Here, we report cryogenic-electron microscopy structures of Caenorhabditis elegans CMT in four key states: apo, acceptor peptide-bound, donor-substrate analog-bound and as a trapped ternary complex with both peptide and a donor-substrate mimic bound. The structures indicate how the C-mannosylation sequon is recognized by this CMT and its paralogs, and how sequon binding triggers conformational activation of the donor substrate: a process relevant to all glycosyltransferase C superfamily enzymes. Our structural data further indicate that the CMTs adopt an unprecedented electrophilic aromatic substitution mechanism to enable the C-glycosylation of proteins. These results afford opportunities for understanding human disease and therapeutic targeting of specific CMT paralogs.
History
DepositionApr 15, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 11, 2023Provider: repository / Type: Initial release
Revision 1.0Jan 11, 2023Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Jan 11, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Jan 11, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Jan 11, 2023Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jan 11, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Jan 11, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Jan 11, 2023Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jan 11, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Jan 11, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jan 18, 2023Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
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Revision 1.3Nov 6, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update
Revision 1.4Jul 9, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 9, 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
H: CMT2-Fab heavy chain
K: Anti-Fab nanobody
L: CMT2-Fab light chain
A: C-mannosyltransferase dpy-19


Theoretical massNumber of molelcules
Total (without water)142,5234
Polymers142,5234
Non-polymers00
Water724
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Antibody CMT2-Fab heavy chain


Mass: 25000.723 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
#2: Antibody Anti-Fab nanobody


Mass: 13390.644 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
#3: Antibody CMT2-Fab light chain


Mass: 23238.750 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
#4: Protein C-mannosyltransferase dpy-19 / Protein dumpy-19


Mass: 80892.602 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Caenorhabditis elegans (invertebrata) / Gene: dpy-19, F22B7.10 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P34413, Transferases; Glycosyltransferases; Hexosyltransferases
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Formula: H2O
Has protein modificationY

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: C-mannosyltransferase CeDPY19, in apo state, bound to CMT2-Fab and anti-Fab nanobody
Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Source (natural)Organism: Caenorhabditis elegans (invertebrata)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 800 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 48 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.75 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 384830 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0059714
ELECTRON MICROSCOPYf_angle_d0.80713198
ELECTRON MICROSCOPYf_dihedral_angle_d13.8193432
ELECTRON MICROSCOPYf_chiral_restr0.0561486
ELECTRON MICROSCOPYf_plane_restr0.0051662

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