6S7O

Cryo-EM structure of human oligosaccharyltransferase complex OST-A

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report



Literature

Cryo-electron microscopy structures of human oligosaccharyltransferase complexes OST-A and OST-B.

Ramirez, A.S., Kowal, J., Locher, K.P.

(2019) Science 366: 1372-1375

  • DOI: 10.1126/science.aaz3505
  • Structures With Same Primary Citation

  • PubMed Abstract: 

    • Oligosaccharyltransferase (OST) catalyzes the transfer of a high-mannose glycan onto secretory proteins in the endoplasmic reticulum. Mammals express two distinct OST complexes that act in a cotranslational (OST-A) or posttranslocational (OST-B) mann ...

    Oligosaccharyltransferase (OST) catalyzes the transfer of a high-mannose glycan onto secretory proteins in the endoplasmic reticulum. Mammals express two distinct OST complexes that act in a cotranslational (OST-A) or posttranslocational (OST-B) manner. Here, we present high-resolution cryo-electron microscopy structures of human OST-A and OST-B. Although they have similar overall architectures, structural differences in the catalytic subunits STT3A and STT3B facilitate contacts to distinct OST subunits, DC2 in OST-A and MAGT1 in OST-B. In OST-A, interactions with TMEM258 and STT3A allow ribophorin-I to form a four-helix bundle that can bind to a translating ribosome, whereas the equivalent region is disordered in OST-B. We observed an acceptor peptide and dolichylphosphate bound to STT3B, but only dolichylphosphate in STT3A, suggesting distinct affinities of the two OST complexes for protein substrates.

    Organizational Affiliation: 

    Institute of Molecular Biology and Biophysics, Eidgenössische Technische Hochschule (ETH), CH-8093 Zürich, Switzerland. locher@mol.biol.ethz.ch.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit STT3AA705Homo sapiensMutation(s): 0 
Gene Names: STT3A, ITM1, TMC
EC: 2.4.99.18
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P46977 (Homo sapiens)
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PHAROS  P46977
GTEx  ENSG00000134910
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 4B37Homo sapiensMutation(s): 0 
Gene Names: OST4
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P0C6T2 (Homo sapiens)
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PHAROS  P0C6T2
GTEx  ENSG00000228474
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Transmembrane protein 258C79Homo sapiensMutation(s): 0 
Gene Names: TMEM258, C11orf10, HSPC005
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P61165 (Homo sapiens)
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PHAROS  P61165
GTEx  ENSG00000134825
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit DAD1D113Homo sapiensMutation(s): 0 
Gene Names: DAD1
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P61803 (Homo sapiens)
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PHAROS  P61803
GTEx  ENSG00000129562
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 1E607Homo sapiensMutation(s): 0 
Gene Names: RPN1
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P04843 (Homo sapiens)
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PHAROS  P04843
GTEx  ENSG00000163902
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  • Reference Sequence

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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 2F631Homo sapiensMutation(s): 0 
Gene Names: RPN2
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P04844 (Homo sapiens)
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PHAROS  P04844
GTEx  ENSG00000118705
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
Dolichyl-diphosphooligosaccharide--protein glycosyltransferase 48 kDa subunitG456Homo sapiensMutation(s): 0 
Gene Names: DDOST, KIAA0115, OST48, OK/SW-cl.45
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for P39656 (Homo sapiens)
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PHAROS  P39656
GTEx  ENSG00000244038
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  • Reference Sequence

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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
Oligosaccharyltransferase complex subunit OSTCH149Homo sapiensMutation(s): 0 
Gene Names: OSTC, DC2, HDCMD45P, HSPC307
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Oligosaccharyltransferases (OST)		Protein: 
Oligosaccharyltransferase A (OST-A)
Find proteins for Q9NRP0 (Homo sapiens)
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PHAROS  Q9NRP0
GTEx  ENSG00000198856
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  • Reference Sequence
Oligosaccharides
Entity ID: 9
MoleculeChainsChain Length2D Diagram Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
I
3 N/A
Entity ID: 10
MoleculeChainsChain Length2D Diagram Glycosylation
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
J
8 N-Glycosylation
Entity ID: 11
MoleculeChainsChain Length2D Diagram Glycosylation
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
K
8 N-Glycosylation
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EGY
Query on EGY
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A, C, D, E, F
(4R,7R)-4-hydroxy-N,N,N-trimethyl-4,9-dioxo-7-[(undecanoyloxy)methyl]-3,5,8-trioxa-4lambda~5~-phosphadocosan-1-aminium
C33 H67 N O8 P
GGHWXDCJHDYMKO-WJOKGBTCSA-O		 Ligand Interaction
KZB
Query on KZB
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A, E, F, G
(2~{S},3~{R},4~{R},5~{S},6~{S})-2-(hydroxymethyl)-6-[(1~{S},2~{R},3~{R},4~{R},5'~{S},6~{S},7~{R},8~{S},9~{R},12~{R},13~{R},15~{S},16~{S},18~{R})-5',7,9,13-tetramethyl-3,15-bis(oxidanyl)spiro[5-oxapentacyclo[10.8.0.0^{2,9}.0^{4,8}.0^{13,18}]icosane-6,2'-oxane]-16-yl]oxy-oxane-3,4,5-triol
C33 H54 O10
PDUIOILJOMOEIH-KWMFFDLQSA-N		 Ligand Interaction
KZE
Query on KZE
Download CCD File 
A
[(3~{R},6~{Z},10~{Z},14~{Z},18~{Z})-3,7,11,15,19,23-hexamethyltetracosa-6,10,14,18,22-pentaenyl] dihydrogen phosphate
C30 H53 O4 P
QHBZVPDZRJSJAI-IFQOQNDLSA-N		 Ligand Interaction
MG
Query on MG
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A, E
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerlandCRSII3_147632

Revision History 

  • Version 1.0: 2019-12-18
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary