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- PDB-6u0r: Cryo-EM structure of the chimeric vector AAV2.7m8 -

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Basic information

Entry
Database: PDB / ID: 6u0r
TitleCryo-EM structure of the chimeric vector AAV2.7m8
ComponentsCapsid protein VP1
KeywordsVIRUS / Protrusion / insertion / receptor
Function / homology
Function and homology information


permeabilization of host organelle membrane involved in viral entry into host cell / symbiont entry into host cell via permeabilization of inner membrane / host cell nucleolus / T=1 icosahedral viral capsid / clathrin-dependent endocytosis of virus by host cell / virion attachment to host cell / structural molecule activity
Similarity search - Function
Phospholipase A2-like domain / Phospholipase A2-like domain / Parvovirus coat protein VP2 / Parvovirus coat protein VP1/VP2 / Parvovirus coat protein VP2 / Capsid/spike protein, ssDNA virus
Similarity search - Domain/homology
2'-DEOXYADENOSINE-5'-MONOPHOSPHATE / Capsid protein VP1
Similarity search - Component
Biological speciesAdeno-associated virus - 2
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.91 Å
AuthorsAgbandje-McKenna, M. / Bennett, A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Center for Research Resources (NIH/NCRR)R01 GM109524 United States
CitationJournal: J Struct Biol / Year: 2020
Title: Structure comparison of the chimeric AAV2.7m8 vector with parental AAV2.
Authors: Antonette Bennett / Annahita Keravala / Victoria Makal / Justin Kurian / Brahim Belbellaa / Rangoli Aeran / Yu-Shan Tseng / Duncan Sousa / John Spear / Mehdi Gasmi / Mavis Agbandje-McKenna /
Abstract: The AAV2.7m8 vector is an engineered capsid with a 10-amino acid insertion in adeno-associated virus (AAV) surface variable region VIII (VR-VIII) resulting in the alteration of an antigenic region of ...The AAV2.7m8 vector is an engineered capsid with a 10-amino acid insertion in adeno-associated virus (AAV) surface variable region VIII (VR-VIII) resulting in the alteration of an antigenic region of AAV2 and the ability to efficiently transduce retina cells following intravitreal administration. Directed evolution and in vivo screening in the mouse retina isolated this vector. In the present study, we sought to identify the structural differences between a recombinant AAV2.7m8 (rAAV2.7m8) vector packaging a GFP genome and its parental serotype, AAV2, by cryo-electron microscopy (cryo-EM) and image reconstruction. The structures of rAAV2.7m8 and AAV2 were determined to 2.91 and 3.02 Å resolution, respectively. The rAAV2.7m8 amino acid side-chains for residues 219-745 (the last C-terminal residue) were interpretable in the density map with the exception of the 10 inserted amino acids. While observable in a low sigma threshold density, side-chains were only resolved at the base of the insertion, likely due to flexibility at the top of the loop. A comparison to parental AAV2 (ordered from residues 217-735) showed the structures to be similar, except at some side-chains that had different orientations and, in VR-VIII containing the 10 amino acid insertion. VR-VIII is part of an AAV2 antigenic epitope, and the difference is consistent with rAAV2.7m8's escape from a known AAV2 monoclonal antibody, C37-B. The observations provide valuable insight into the configuration of inserted surface peptides on the AAV capsid and structural differences to be leveraged for future AAV vector rational design, especially for retargeted tropism and antibody escape.
History
DepositionAug 14, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 19, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 20, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 2.0May 29, 2024Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Derived calculations / Non-polymer description
Category: atom_site / chem_comp ...atom_site / chem_comp / chem_comp_atom / chem_comp_bond / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_unobs_or_zero_occ_atoms / struct_site
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_atom_id / _atom_site.auth_comp_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.type_symbol / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.type / _chem_comp_atom.atom_id / _chem_comp_atom.comp_id / _chem_comp_atom.pdbx_aromatic_flag / _chem_comp_atom.pdbx_stereo_config / _chem_comp_atom.type_symbol / _chem_comp_bond.atom_id_1 / _chem_comp_bond.atom_id_2 / _chem_comp_bond.comp_id / _chem_comp_bond.pdbx_aromatic_flag / _chem_comp_bond.value_order / _pdbx_entity_nonpoly.comp_id / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id / _pdbx_unobs_or_zero_occ_atoms.auth_atom_id / _pdbx_unobs_or_zero_occ_atoms.auth_comp_id / _pdbx_unobs_or_zero_occ_atoms.label_atom_id / _pdbx_unobs_or_zero_occ_atoms.label_comp_id / _struct_site.details / _struct_site.pdbx_auth_comp_id

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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
A: Capsid protein VP1
B: Capsid protein VP1
C: Capsid protein VP1
D: Capsid protein VP1
E: Capsid protein VP1
F: Capsid protein VP1
G: Capsid protein VP1
H: Capsid protein VP1
I: Capsid protein VP1
J: Capsid protein VP1
K: Capsid protein VP1
L: Capsid protein VP1
M: Capsid protein VP1
N: Capsid protein VP1
O: Capsid protein VP1
P: Capsid protein VP1
Q: Capsid protein VP1
R: Capsid protein VP1
S: Capsid protein VP1
T: Capsid protein VP1
U: Capsid protein VP1
V: Capsid protein VP1
W: Capsid protein VP1
X: Capsid protein VP1
Y: Capsid protein VP1
Z: Capsid protein VP1
a: Capsid protein VP1
b: Capsid protein VP1
c: Capsid protein VP1
d: Capsid protein VP1
e: Capsid protein VP1
f: Capsid protein VP1
g: Capsid protein VP1
h: Capsid protein VP1
i: Capsid protein VP1
j: Capsid protein VP1
k: Capsid protein VP1
l: Capsid protein VP1
m: Capsid protein VP1
n: Capsid protein VP1
o: Capsid protein VP1
p: Capsid protein VP1
q: Capsid protein VP1
r: Capsid protein VP1
s: Capsid protein VP1
t: Capsid protein VP1
u: Capsid protein VP1
v: Capsid protein VP1
w: Capsid protein VP1
x: Capsid protein VP1
y: Capsid protein VP1
z: Capsid protein VP1
1: Capsid protein VP1
2: Capsid protein VP1
3: Capsid protein VP1
4: Capsid protein VP1
5: Capsid protein VP1
6: Capsid protein VP1
7: Capsid protein VP1
8: Capsid protein VP1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)3,599,212120
Polymers3,579,33960
Non-polymers19,87360
Water00
1


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

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Components

#1: Protein ...
Capsid protein VP1


Mass: 59655.652 Da / Num. of mol.: 60
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Adeno-associated virus - 2 / Gene: VP1 / Cell line (production host): SF9 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P03135
#2: Chemical...
ChemComp-D5M / 2'-DEOXYADENOSINE-5'-MONOPHOSPHATE


Mass: 331.222 Da / Num. of mol.: 60 / Source method: obtained synthetically / Formula: C10H14N5O6P
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: Adeno-associated virus - 2.7m8 / Type: VIRUS / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 4 MDa / Experimental value: NO
Source (natural)Organism: Adeno-associated virus - 2
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Cell: SF9
Details of virusEmpty: NO / Enveloped: NO / Isolate: OTHER / Type: VIRION
Virus shellDiameter: 260 nm / Triangulation number (T number): 1
Buffer solutionpH: 7.4
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen 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 FIELD
Image recordingElectron dose: 75 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 410

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Processing

EM software
IDNameCategory
4Auto3DEMCTF correction
13Auto3DEM3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 27365
3D reconstructionResolution: 2.91 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 27364 / Symmetry type: POINT
Atomic model buildingB value: 100 / Protocol: FLEXIBLE FIT

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