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- PDB-7zgj: Trypanosoma brucei gambiense ISG65 in complex with human compleme... -

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Basic information

Entry
Database: PDB / ID: 7zgj
TitleTrypanosoma brucei gambiense ISG65 in complex with human complement component C3
Components
  • 65 kDa invariant surface glycoprotein, putative
  • Complement C3
  • Complement C3 beta chain
KeywordsIMMUNE SYSTEM / complement / complex
Function / homology
Function and homology information


C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / positive regulation of activation of membrane attack complex / vertebrate eye-specific patterning / positive regulation of apoptotic cell clearance / complement-mediated synapse pruning / Alternative complement activation / positive regulation of lipid storage / positive regulation of phagocytosis, engulfment ...C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / positive regulation of activation of membrane attack complex / vertebrate eye-specific patterning / positive regulation of apoptotic cell clearance / complement-mediated synapse pruning / Alternative complement activation / positive regulation of lipid storage / positive regulation of phagocytosis, engulfment / positive regulation of G protein-coupled receptor signaling pathway / Activation of C3 and C5 / complement receptor mediated signaling pathway / positive regulation of type IIa hypersensitivity / positive regulation of D-glucose transmembrane transport / complement-dependent cytotoxicity / complement activation / complement activation, alternative pathway / endopeptidase inhibitor activity / neuron remodeling / B cell activation / amyloid-beta clearance / positive regulation of vascular endothelial growth factor production / Purinergic signaling in leishmaniasis infection / complement activation, classical pathway / Peptide ligand-binding receptors / Regulation of Complement cascade / fatty acid metabolic process / Post-translational protein phosphorylation / response to bacterium / positive regulation of receptor-mediated endocytosis / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / positive regulation of angiogenesis / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / azurophil granule lumen / G alpha (i) signalling events / secretory granule lumen / blood microparticle / receptor ligand activity / inflammatory response / immune response / positive regulation of protein phosphorylation / G protein-coupled receptor signaling pathway / endoplasmic reticulum lumen / signaling receptor binding / Neutrophil degranulation / cell surface / signal transduction / protein-containing complex / extracellular space / extracellular exosome / extracellular region / membrane / plasma membrane
Similarity search - Function
Trypanosome invariant surface glycoprotein / Invariant surface glycoprotein / : / : / Complement component 3, CUB domain, second segment / Complement component 3, CUB domain, first segment / Complement C3-like, NTR domain / Alpha-2-macroglobulin, conserved site / Alpha-2-macroglobulin family thiolester region signature. / Complement C3/4/5, macroglobulin domain MG1 ...Trypanosome invariant surface glycoprotein / Invariant surface glycoprotein / : / : / Complement component 3, CUB domain, second segment / Complement component 3, CUB domain, first segment / Complement C3-like, NTR domain / Alpha-2-macroglobulin, conserved site / Alpha-2-macroglobulin family thiolester region signature. / Complement C3/4/5, macroglobulin domain MG1 / Macroglobulin domain MG1 / : / Alpha-macro-globulin thiol-ester bond-forming region / Anaphylatoxin, complement system domain / Anaphylatoxin domain signature. / Anaphylatoxin, complement system / Anaphylatoxin/fibulin / Anaphylotoxin-like domain / Anaphylatoxin domain profile. / Anaphylatoxin homologous domain / Netrin C-terminal Domain / Netrin module, non-TIMP type / UNC-6/NTR/C345C module / : / Alpha-macroglobulin, receptor-binding / Alpha-macroglobulin, receptor-binding domain superfamily / Macroglobulin domain MG4 / Macroglobulin domain MG3 / A-macroglobulin receptor binding domain / Macroglobulin domain MG4 / Macroglobulin domain MG3 / A-macroglobulin receptor / Netrin domain / NTR domain profile. / Alpha-2-macroglobulin / Macroglobulin domain / Alpha-2-macroglobulin, bait region domain / Alpha-macroglobulin-like, TED domain / Alpha-2-macroglobulin family / MG2 domain / A-macroglobulin TED domain / Alpha-2-macroglobulin bait region domain / Alpha-2-Macroglobulin / Alpha-2-macroglobulin family / Tissue inhibitor of metalloproteinases-like, OB-fold / Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid / Immunoglobulin-like fold
Similarity search - Domain/homology
65 kDa invariant surface glycoprotein, putative / Complement C3
Similarity search - Component
Biological speciesTrypanosoma brucei gambiense (eukaryote)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.58 Å
AuthorsSuelzen, H. / Zoll, S.
Funding support Czech Republic, 1items
OrganizationGrant numberCountry
Grant Agency of the Czech Republic22-21612S Czech Republic
CitationJournal: Nat Commun / Year: 2023
Title: Cryo-EM structures of Trypanosoma brucei gambiense ISG65 with human complement C3 and C3b and their roles in alternative pathway restriction.
Authors: Hagen Sülzen / Jakub Began / Arun Dhillon / Sami Kereïche / Petr Pompach / Jitka Votrubova / Farnaz Zahedifard / Adriana Šubrtova / Marie Šafner / Martin Hubalek / Maaike Thompson / ...Authors: Hagen Sülzen / Jakub Began / Arun Dhillon / Sami Kereïche / Petr Pompach / Jitka Votrubova / Farnaz Zahedifard / Adriana Šubrtova / Marie Šafner / Martin Hubalek / Maaike Thompson / Martin Zoltner / Sebastian Zoll /
Abstract: African Trypanosomes have developed elaborate mechanisms to escape the adaptive immune response, but little is known about complement evasion particularly at the early stage of infection. Here we ...African Trypanosomes have developed elaborate mechanisms to escape the adaptive immune response, but little is known about complement evasion particularly at the early stage of infection. Here we show that ISG65 of the human-infective parasite Trypanosoma brucei gambiense is a receptor for human complement factor C3 and its activation fragments and that it takes over a role in selective inhibition of the alternative pathway C5 convertase and thus abrogation of the terminal pathway. No deposition of C4b, as part of the classical and lectin pathway convertases, was detected on trypanosomes. We present the cryo-electron microscopy (EM) structures of native C3 and C3b in complex with ISG65 which reveal a set of modes of complement interaction. Based on these findings, we propose a model for receptor-ligand interactions as they occur at the plasma membrane of blood-stage trypanosomes and may facilitate innate immune escape of the parasite.
History
DepositionApr 3, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 5, 2023Provider: repository / Type: Initial release
Revision 1.1May 3, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.pdbx_database_id_DOI / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Mar 27, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / citation
Item: _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Complement C3 beta chain
B: Complement C3
C: 65 kDa invariant surface glycoprotein, putative


Theoretical massNumber of molelcules
Total (without water)225,3873
Polymers225,3873
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: surface plasmon resonance
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area10510 Å2
ΔGint-64 kcal/mol
Surface area89330 Å2

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Components

#1: Protein Complement C3 beta chain


Mass: 71393.320 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P01024
#2: Protein Complement C3 / C3 and PZP-like alpha-2-macroglobulin domain-containing protein 1


Mass: 113169.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P01024
#3: Protein 65 kDa invariant surface glycoprotein, putative


Mass: 40823.516 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Trypanosoma brucei gambiense (eukaryote)
Strain: MHOM/CI/86/DAL972 / Gene: TbgDal_II1600 / Production host: Escherichia coli (E. coli) / References: UniProt: C9ZJ67

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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

Component
IDNameTypeEntity IDParent-IDSource
1Trypanosoma brucei gambiense ISG65 in complex with human complement component C3COMPLEXall0MULTIPLE SOURCES
2Complement C3 beta chainCOMPLEX#11NATURAL
365 kDa invariant surface glycoproteinCOMPLEX#31RECOMBINANT
4Complement C3 alpha chainCOMPLEX#21NATURAL
Molecular weight
IDEntity assembly-IDExperimental value
11NO
21
31
41
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
33Trypanosoma brucei gambiense (eukaryote)31285
44Homo Sapiens (human)9606
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESC8H18N2O4S1
2150 mMsodium chlorideNaCl1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: C-flat-1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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: 1500 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 41.1 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.58 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 406545 / Symmetry type: POINT

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