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- PDB-6u2k: EM structure of MPEG-1 (L425K, alpha conformation) soluble pre-po... -

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Basic information

Entry
Database: PDB / ID: 6u2k
TitleEM structure of MPEG-1 (L425K, alpha conformation) soluble pre-pore complex
ComponentsMacrophage-expressed gene 1 protein
KeywordsIMMUNE SYSTEM / MPEG-1/perforin-2 / MACPF / macrophage / pore forming proteins / immunity
Function / homology
Function and homology information


dendritic cell antigen processing and presentation / antigen processing and presentation of exogenous peptide antigen / phagolysosome membrane / antibacterial innate immune response / wide pore channel activity / antigen processing and presentation of exogenous peptide antigen via MHC class I / phagocytic vesicle / phagocytic vesicle membrane / cytoplasmic vesicle / defense response to Gram-negative bacterium ...dendritic cell antigen processing and presentation / antigen processing and presentation of exogenous peptide antigen / phagolysosome membrane / antibacterial innate immune response / wide pore channel activity / antigen processing and presentation of exogenous peptide antigen via MHC class I / phagocytic vesicle / phagocytic vesicle membrane / cytoplasmic vesicle / defense response to Gram-negative bacterium / adaptive immune response / defense response to Gram-positive bacterium / defense response to bacterium / extracellular region
Similarity search - Function
Macrophage-expressed gene 1 protein / membrane-attack complex / perforin / Membrane attack complex/perforin (MACPF) domain profile. / MAC/Perforin domain / Membrane attack complex component/perforin (MACPF) domain
Similarity search - Domain/homology
Macrophage-expressed gene 1 protein
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.93 Å
AuthorsPang, S.S. / Bayly-Jones, C.
Funding support Australia, 1items
OrganizationGrant numberCountry
Australian Research Council (ARC) Australia
CitationJournal: Nat Commun / Year: 2019
Title: The cryo-EM structure of the acid activatable pore-forming immune effector Macrophage-expressed gene 1.
Authors: Siew Siew Pang / Charles Bayly-Jones / Mazdak Radjainia / Bradley A Spicer / Ruby H P Law / Adrian W Hodel / Edward S Parsons / Susan M Ekkel / Paul J Conroy / Georg Ramm / Hariprasad ...Authors: Siew Siew Pang / Charles Bayly-Jones / Mazdak Radjainia / Bradley A Spicer / Ruby H P Law / Adrian W Hodel / Edward S Parsons / Susan M Ekkel / Paul J Conroy / Georg Ramm / Hariprasad Venugopal / Phillip I Bird / Bart W Hoogenboom / Ilia Voskoboinik / Yann Gambin / Emma Sierecki / Michelle A Dunstone / James C Whisstock /
Abstract: Macrophage-expressed gene 1 (MPEG1/Perforin-2) is a perforin-like protein that functions within the phagolysosome to damage engulfed microbes. MPEG1 is thought to form pores in target membranes, ...Macrophage-expressed gene 1 (MPEG1/Perforin-2) is a perforin-like protein that functions within the phagolysosome to damage engulfed microbes. MPEG1 is thought to form pores in target membranes, however, its mode of action remains unknown. We use cryo-Electron Microscopy (cryo-EM) to determine the 2.4 Å structure of a hexadecameric assembly of MPEG1 that displays the expected features of a soluble prepore complex. We further discover that MPEG1 prepore-like assemblies can be induced to perforate membranes through acidification, such as would occur within maturing phagolysosomes. We next solve the 3.6 Å cryo-EM structure of MPEG1 in complex with liposomes. These data reveal that a multi-vesicular body of 12 kDa (MVB12)-associated β-prism (MABP) domain binds membranes such that the pore-forming machinery of MPEG1 is oriented away from the bound membrane. This unexpected mechanism of membrane interaction suggests that MPEG1 remains bound to the phagolysosome membrane while simultaneously forming pores in engulfed bacterial targets.
History
DepositionAug 20, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 25, 2019Provider: repository / Type: Initial release
Revision 1.1Oct 2, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Jan 15, 2020Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / struct_asym / struct_conn / struct_site / struct_site_gen
Item: _atom_site.auth_asym_id / _atom_site.auth_seq_id ..._atom_site.auth_asym_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _chem_comp.name / _chem_comp.type / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _entity.type / _pdbx_struct_assembly_gen.asym_id_list / _struct_conn.pdbx_role / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation

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Structure visualization

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Assembly

Deposited unit
B: Macrophage-expressed gene 1 protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)71,9753
Polymers71,1261
Non-polymers8492
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Macrophage-expressed gene 1 protein / Mpg-1 / Perforin-2 / P-2


Mass: 71126.148 Da / Num. of mol.: 1 / Mutation: L425K
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MPEG1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q2M385
#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.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam 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
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
Has ligand of interestN

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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: Head-to-head assembly of MPEG-1 (L425K, alpha conformation) soluble pre-pore
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 2.3 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.2
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
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 FIELDBright-field microscopy
Image recordingElectron dose: 44.8 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.93 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 527402 / Symmetry type: POINT

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