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- PDB-7l6m: Cryo-EM structure of DH898.1 Fab-dimer from local refinement of t... -

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Basic information

Entry
Database: PDB / ID: 7l6m
TitleCryo-EM structure of DH898.1 Fab-dimer from local refinement of the Fab-dimer bound near the CD4 binding site of HIV-1 Env CH848 SOSIP trimer
Components
  • DH898.1 Fab heavy chain
  • DH898.1 Fab light chain
KeywordsIMMUNE SYSTEM / Fab-dimerized / glycan-reactive / antibodies / HIV-1 / DH898.1 / Fab-dimer / glycan-reactive neutralizing antibody / macaque HIV-1 vaccine-induced / B cell lineage
Biological speciesMacaca mulatta (Rhesus monkey)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.7 Å
AuthorsManne, K. / Edwards, R.J. / Acharya, P.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI145687 United States
Citation
Journal: Cell / Year: 2021
Title: Fab-dimerized glycan-reactive antibodies are a structural category of natural antibodies.
Authors: Wilton B Williams / R Ryan Meyerhoff / R J Edwards / Hui Li / Kartik Manne / Nathan I Nicely / Rory Henderson / Ye Zhou / Katarzyna Janowska / Katayoun Mansouri / Sophie Gobeil / Tyler ...Authors: Wilton B Williams / R Ryan Meyerhoff / R J Edwards / Hui Li / Kartik Manne / Nathan I Nicely / Rory Henderson / Ye Zhou / Katarzyna Janowska / Katayoun Mansouri / Sophie Gobeil / Tyler Evangelous / Bhavna Hora / Madison Berry / A Yousef Abuahmad / Jordan Sprenz / Margaret Deyton / Victoria Stalls / Megan Kopp / Allen L Hsu / Mario J Borgnia / Guillaume B E Stewart-Jones / Matthew S Lee / Naomi Bronkema / M Anthony Moody / Kevin Wiehe / Todd Bradley / S Munir Alam / Robert J Parks / Andrew Foulger / Thomas Oguin / Gregory D Sempowski / Mattia Bonsignori / Celia C LaBranche / David C Montefiori / Michael Seaman / Sampa Santra / John Perfect / Joseph R Francica / Geoffrey M Lynn / Baptiste Aussedat / William E Walkowicz / Richard Laga / Garnett Kelsoe / Kevin O Saunders / Daniela Fera / Peter D Kwong / Robert A Seder / Alberto Bartesaghi / George M Shaw / Priyamvada Acharya / Barton F Haynes /
Abstract: Natural antibodies (Abs) can target host glycans on the surface of pathogens. We studied the evolution of glycan-reactive B cells of rhesus macaques and humans using glycosylated HIV-1 envelope (Env) ...Natural antibodies (Abs) can target host glycans on the surface of pathogens. We studied the evolution of glycan-reactive B cells of rhesus macaques and humans using glycosylated HIV-1 envelope (Env) as a model antigen. 2G12 is a broadly neutralizing Ab (bnAb) that targets a conserved glycan patch on Env of geographically diverse HIV-1 strains using a unique heavy-chain (V) domain-swapped architecture that results in fragment antigen-binding (Fab) dimerization. Here, we describe HIV-1 Env Fab-dimerized glycan (FDG)-reactive bnAbs without V-swapped domains from simian-human immunodeficiency virus (SHIV)-infected macaques. FDG Abs also recognized cell-surface glycans on diverse pathogens, including yeast and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike. FDG precursors were expanded by glycan-bearing immunogens in macaques and were abundant in HIV-1-naive humans. Moreover, FDG precursors were predominately mutated IgMIgDCD27, thus suggesting that they originated from a pool of antigen-experienced IgM or marginal zone B cells.
#1: Journal: bioRxiv / Year: 2020
Title: Fab-dimerized glycan-reactive antibodies neutralize HIV and are prevalent in humans and rhesus macaques
Authors: Acharya, P. / Williams, W. / Henderson, R. / Janowska, K. / Manne, K. / Parks, R. / Deyton, M. / Sprenz, J. / Stalls, V. / Kopp, M. / Mansouri, K. / Edwards, R.J. / Meyerhoff, R.R. / Oguin, ...Authors: Acharya, P. / Williams, W. / Henderson, R. / Janowska, K. / Manne, K. / Parks, R. / Deyton, M. / Sprenz, J. / Stalls, V. / Kopp, M. / Mansouri, K. / Edwards, R.J. / Meyerhoff, R.R. / Oguin, T. / Sempowski, G. / Saunders, K. / Haynes, B.F.
History
DepositionDec 23, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 10, 2021Provider: repository / Type: Initial release
Revision 2.0Mar 24, 2021Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Database references / Derived calculations / Refinement description / Structure summary
Category: atom_site / atom_type ...atom_site / atom_type / em_software / pdbx_poly_seq_scheme / pdbx_struct_assembly_prop / pdbx_struct_sheet_hbond / pdbx_validate_close_contact / pdbx_validate_peptide_omega / pdbx_validate_planes / pdbx_validate_rmsd_angle / pdbx_validate_torsion / refine_ls_restr / software / struct / struct_conf / struct_conn / struct_mon_prot_cis / struct_ref_seq / struct_sheet / struct_sheet_order / struct_sheet_range
Item: _em_software.category / _em_software.fitting_id ..._em_software.category / _em_software.fitting_id / _em_software.imaging_id / _em_software.name / _pdbx_poly_seq_scheme.auth_seq_num / _pdbx_poly_seq_scheme.pdb_ins_code / _pdbx_poly_seq_scheme.pdb_seq_num / _pdbx_struct_assembly_prop.value / _struct.pdbx_descriptor / _struct_conf.beg_auth_asym_id / _struct_conf.beg_auth_comp_id / _struct_conf.beg_auth_seq_id / _struct_conf.beg_label_asym_id / _struct_conf.beg_label_comp_id / _struct_conf.beg_label_seq_id / _struct_conf.end_auth_asym_id / _struct_conf.end_auth_comp_id / _struct_conf.end_auth_seq_id / _struct_conf.end_label_asym_id / _struct_conf.end_label_comp_id / _struct_conf.end_label_seq_id / _struct_conf.pdbx_PDB_helix_class / _struct_conf.pdbx_PDB_helix_length / _struct_conf.pdbx_end_PDB_ins_code / _struct_conn.pdbx_dist_value / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr2_auth_seq_id / _struct_mon_prot_cis.auth_seq_id / _struct_mon_prot_cis.pdbx_auth_seq_id_2 / _struct_mon_prot_cis.pdbx_omega_angle / _struct_ref_seq.db_align_end / _struct_ref_seq.pdbx_auth_seq_align_end
Description: Sequence discrepancy
Details: Replaced model with the correct (Kabat) sequence numbering
Provider: author / Type: Coordinate replacement
Revision 2.1Jun 2, 2021Group: Database references / Category: citation / citation_author
Revision 2.2Jun 9, 2021Group: Database references / Category: citation / Item: _citation.journal_volume / _citation.page_first

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Structure visualization

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  • Deposited structure unit
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  • EMDB-23145
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Structure viewerMolecule:
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Assembly

Deposited unit
g: DH898.1 Fab light chain
h: DH898.1 Fab heavy chain
i: DH898.1 Fab heavy chain
j: DH898.1 Fab light chain


Theoretical massNumber of molelcules
Total (without water)94,3004
Polymers94,3004
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area7550 Å2
ΔGint-59 kcal/mol
Surface area40180 Å2

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Components

#1: Antibody DH898.1 Fab light chain


Mass: 23553.250 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Macaca mulatta (Rhesus monkey) / Production host: Homo sapiens (human)
#2: Antibody DH898.1 Fab heavy chain


Mass: 23596.594 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Macaca mulatta (Rhesus monkey) / Production host: Homo sapiens (human)

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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: local refinement of DH898.1 Fab-dimer bound near CD4bs of CH848 trimer
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Macaca mulatta (Rhesus monkey)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
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: LEICA EM GP / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 293 K / Details: blot for 2.5 seconds before 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 / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 93.15 K / Temperature (min): 93.15 K
Image recordingElectron dose: 62 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 3230

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM software
IDNameCategory
2Latitudeimage acquisition
4cryoSPARCCTF correction
7UCSF Chimeramodel fitting
8Cootmodel fitting
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC3D reconstruction
14Cootmodel refinement
15PHENIXmodel refinement
16ISOLDEmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 4.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 59012 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0126800
ELECTRON MICROSCOPYf_angle_d2.0479278
ELECTRON MICROSCOPYf_dihedral_angle_d18.6242414
ELECTRON MICROSCOPYf_chiral_restr0.1031064
ELECTRON MICROSCOPYf_plane_restr0.0171186

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