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- PDB-5vn8: Cryo-EM model of B41 SOSIP.664 in complex with fragment antigen b... -

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Basic information

Entry
Database: PDB / ID: 5vn8
TitleCryo-EM model of B41 SOSIP.664 in complex with fragment antigen binding variable domain of b12
Components
  • (Envelope glycoprotein ...) x 2
  • b12 Fab heavy chain
  • b12 Fab light chain
KeywordsIMMUNE SYSTEM / neutralizing antibody / HIV-1 / envelope glycoprotein / receptor binding site
Function / homology
Function and homology information


positive regulation of plasma membrane raft polarization / positive regulation of receptor clustering / positive regulation of establishment of T cell polarity / virus-mediated perturbation of host defense response / host cell endosome membrane / clathrin-dependent endocytosis of virus by host cell / viral protein processing / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope ...positive regulation of plasma membrane raft polarization / positive regulation of receptor clustering / positive regulation of establishment of T cell polarity / virus-mediated perturbation of host defense response / host cell endosome membrane / clathrin-dependent endocytosis of virus by host cell / viral protein processing / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / structural molecule activity / virion attachment to host cell / host cell plasma membrane / virion membrane / plasma membrane
Similarity search - Function
Envelope glycoprotein Gp160 / Retroviral envelope protein / Retroviral envelope protein GP41-like / Gp120 core superfamily / Envelope glycoprotein GP120 / Human immunodeficiency virus 1, envelope glycoprotein Gp120 / Immunoglobulins / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
Envelope glycoprotein gp160 / Envelope glycoprotein gp160
Similarity search - Component
Biological speciesHuman immunodeficiency virus 1
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsOzorowski, G. / Pallesen, J. / Ward, A.B. / Cottrell, C.A.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)UM1AI100663 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)P01 AI110657 United States
CitationJournal: Nature / Year: 2017
Title: Open and closed structures reveal allostery and pliability in the HIV-1 envelope spike.
Authors: Gabriel Ozorowski / Jesper Pallesen / Natalia de Val / Dmitry Lyumkis / Christopher A Cottrell / Jonathan L Torres / Jeffrey Copps / Robyn L Stanfield / Albert Cupo / Pavel Pugach / John P ...Authors: Gabriel Ozorowski / Jesper Pallesen / Natalia de Val / Dmitry Lyumkis / Christopher A Cottrell / Jonathan L Torres / Jeffrey Copps / Robyn L Stanfield / Albert Cupo / Pavel Pugach / John P Moore / Ian A Wilson / Andrew B Ward /
Abstract: For many enveloped viruses, binding to a receptor(s) on a host cell acts as the first step in a series of events culminating in fusion with the host cell membrane and transfer of genetic material for ...For many enveloped viruses, binding to a receptor(s) on a host cell acts as the first step in a series of events culminating in fusion with the host cell membrane and transfer of genetic material for replication. The envelope glycoprotein (Env) trimer on the surface of HIV is responsible for receptor binding and fusion. Although Env can tolerate a high degree of mutation in five variable regions (V1-V5), and also at N-linked glycosylation sites that contribute roughly half the mass of Env, the functional sites for recognition of receptor CD4 and co-receptor CXCR4/CCR5 are conserved and essential for viral fitness. Soluble SOSIP Env trimers are structural and antigenic mimics of the pre-fusion native, surface-presented Env, and are targets of broadly neutralizing antibodies. Thus, they are attractive immunogens for vaccine development. Here we present high-resolution cryo-electron microscopy structures of subtype B B41 SOSIP Env trimers in complex with CD4 and antibody 17b, or with antibody b12, at resolutions of 3.7 Å and 3.6 Å, respectively. We compare these to cryo-electron microscopy reconstructions of B41 SOSIP Env trimers with no ligand or in complex with either CD4 or the CD4-binding-site antibody PGV04 at 5.6 Å, 5.2 Å and 7.4 Å resolution, respectively. Consequently, we present the most complete description yet, to our knowledge, of the CD4-17b-induced intermediate and provide the molecular basis of the receptor-binding-induced conformational change required for HIV-1 entry into host cells. Both CD4 and b12 induce large, previously uncharacterized conformational rearrangements in the gp41 subunits, and the fusion peptide becomes buried in a newly formed pocket. These structures provide key details on the biological function of the type I viral fusion machine from HIV-1 as well as new templates for inhibitor design.
History
DepositionApr 28, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 12, 2017Provider: repository / Type: Initial release
Revision 1.1Jul 26, 2017Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name
Revision 1.2Aug 2, 2017Group: Author supporting evidence / Database references / Category: citation / pdbx_audit_support
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _pdbx_audit_support.funding_organization
Revision 1.3Jul 18, 2018Group: Data collection / Experimental preparation / Category: em_sample_support / em_software / Item: _em_sample_support.grid_type / _em_software.name
Revision 1.4Dec 11, 2019Group: 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
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.type_symbol / _chem_comp.name / _chem_comp.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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  • Deposited structure unit
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  • EMDB-8717
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Structure viewerMolecule:
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Assembly

Deposited unit
G: Envelope glycoprotein gp160
A: Envelope glycoprotein gp160
H: b12 Fab heavy chain
L: b12 Fab light chain
D: Envelope glycoprotein gp160
B: Envelope glycoprotein gp160
F: b12 Fab heavy chain
J: b12 Fab light chain
E: Envelope glycoprotein gp160
C: Envelope glycoprotein gp160
I: b12 Fab heavy chain
K: b12 Fab light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)394,77378
Polymers371,03512
Non-polymers23,73766
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy, gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area64140 Å2
ΔGint139 kcal/mol
Surface area121770 Å2

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Components

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Envelope glycoprotein ... , 2 types, 6 molecules GDEABC

#1: Protein Envelope glycoprotein gp160


Mass: 57702.469 Da / Num. of mol.: 3 / Mutation: A501C
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: env / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: B3UES2
#2: Protein Envelope glycoprotein gp160


Mass: 17357.824 Da / Num. of mol.: 3 / Mutation: I559P, T605C
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: env / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: B3UEZ6

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Antibody , 2 types, 6 molecules HFILJK

#3: Antibody b12 Fab heavy chain


Mass: 24910.846 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293F / Production host: Homo sapiens (human)
#4: Antibody b12 Fab light chain


Mass: 23707.354 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293F / Production host: Homo sapiens (human)

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Sugars , 4 types, 66 molecules

#5: 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.: 21
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
#6: Polysaccharide
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 9
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#7: Polysaccharide alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3/a4-b1_b4-c1_c3-d1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#8: Sugar...
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 33
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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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
1HIV-1 Env B41 SOSIP.664 in complex with b12 fragment antigen bindingCOMPLEX#1-#40MULTIPLE SOURCES
2HIV-1 Env B41 SOSIP.664COMPLEX#1-#21RECOMBINANT
3b12 fragmentCOMPLEX#3-#41RECOMBINANT
Molecular weightValue: 0.57 MDa / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Human immunodeficiency virus 111676
23Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDCell
12Homo sapiens (human)9606HEK293F
23Homo sapiens (human)9606HEK293F
Buffer solutionpH: 7.4
Details: DDM was added to a final concentration of 0.06 mM prior to vitrification
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chlorideNaClSodium chloride1
250 mMTris1
30.06 mMDDM1
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: B41 SOSIP.664 was incubated with a 6X molar excess of 17b Fab overnight at room temperature, purified by size exclusion chromatography, and concentrated prior to grid application
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: C-flat-2/2
VitrificationInstrument: HOMEMADE PLUNGER / Cryogen name: ETHANE / Chamber temperature: 277 K
Details: 3 uL of sample applied to a holey carbon grid on glow discharged face and blotted manually on sample side until filter paper detached from grid, followed by immediate plunging

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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 / Nominal magnification: 22500 X / Calibrated magnification: 38168 X / Nominal defocus max: 4000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10 sec. / Electron dose: 58 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 1300
Image scansSampling size: 0.000131 µm / Width: 4096 / Height: 4096 / Movie frames/image: 50 / Used frames/image: 1-50

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
EM software
IDNameVersionCategoryDetails
2Leginonimage acquisition
4Gctf1.06CTF correction
7UCSF Chimera1.10.1model fitting
9Rosetta2016.02.58402model refinement
10PHENIX1.11.1-2575model refinementPhenix.real_space_refine
11RELION2initial Euler assignment
12RELION2final Euler assignment
13RELION2classification
14RELION23D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 88071 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL / Target criteria: EMRinger
Details: Homology model of B41 SOSIP.664 created using PDB 5CEZ as initial model. b12 coordinates taken from PDB 2NY7. Performed fragment based refinement using Rosetta, followed by relaxed ...Details: Homology model of B41 SOSIP.664 created using PDB 5CEZ as initial model. b12 coordinates taken from PDB 2NY7. Performed fragment based refinement using Rosetta, followed by relaxed refinement in Rosetta. Modeled glycans using Chimera and performed final refinements using Phenix.
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00621147
ELECTRON MICROSCOPYf_angle_d1.13328914
ELECTRON MICROSCOPYf_dihedral_angle_d4.19412258
ELECTRON MICROSCOPYf_chiral_restr0.0653504
ELECTRON MICROSCOPYf_plane_restr0.0075973

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