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- PDB-7na6: Cryo-EM structure of AAV True Type -

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Basic information

Entry
Database: PDB / ID: 7na6
TitleCryo-EM structure of AAV True Type
ComponentsCapsid protein VP1
KeywordsVIRUS / Icosahedron / vector / therapeutic / beta-barrel
Function / homologyPhospholipase 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 / T=1 icosahedral viral capsid / structural molecule activity / Capsid protein VP1
Function and homology information
Biological speciesAdeno-associated virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.35 Å
AuthorsBennett, A.D. / McKenna, R.
CitationJournal: J Struct Biol / Year: 2021
Title: Comparative structural, biophysical, and receptor binding study of true type and wild type AAV2.
Authors: Antonette Bennett / Joshua Hull / Nelly Jolinon / Julie Tordo / Katie Moss / Enswert Binns / Mario Mietzsch / Cathleen Hagemann / R Michael Linden / Andrea Serio / Paul Chipman / Duncan ...Authors: Antonette Bennett / Joshua Hull / Nelly Jolinon / Julie Tordo / Katie Moss / Enswert Binns / Mario Mietzsch / Cathleen Hagemann / R Michael Linden / Andrea Serio / Paul Chipman / Duncan Sousa / Felix Broecker / Peter Seeberger / Els Henckaerts / Robert McKenna / Mavis Agbandje-McKenna /
Abstract: Adeno-associated viruses (AAV) are utilized as gene transfer vectors in the treatment of monogenic disorders. A variant, rationally engineered based on natural AAV2 isolates, designated AAV-True Type ...Adeno-associated viruses (AAV) are utilized as gene transfer vectors in the treatment of monogenic disorders. A variant, rationally engineered based on natural AAV2 isolates, designated AAV-True Type (AAV-TT), is highly neurotropic compared to wild type AAV2 in vivo, and vectors based on it, are currently being evaluated for central nervous system applications. AAV-TT differs from AAV2 by 14 amino acids, including R585S and R588T, two residues previously shown to be essential for heparan sulfate binding of AAV2. The capsid structures of AAV-TT and AAV2 visualized by cryo-electron microscopy at 3.4 and 3.0 Å resolution, respectively, highlighted structural perturbations at specific amino acid differences. Differential scanning fluorimetry (DSF) performed at different pH conditions demonstrated that the melting temperature (T) of AAV2 was consistently ∼5 °C lower than AAV-TT, but both showed maximal stability at pH 5.5, corresponding to the pH in the late endosome, proposed as required for VP1u externalization to facilitate endosomal escape. Reintroduction of arginines at positions 585 and 588 in AAV-TT caused a reduction in T, demonstrating that the lack of basic amino acids at these positions are associated with capsid stability. These results provide structural and thermal annotation of AAV2/AAV-TT residue differences, that account for divergent cell binding, transduction, antigenic reactivity, and transduction of permissive tissues between the two viruses. Specifically, these data indicate that AAV-TT may not utilize a glycan receptor mediated pathway to enter cells and may have lower antigenic properties as compared to AAV2.
History
DepositionJun 19, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 29, 2021Provider: repository / Type: Initial release
Revision 1.1Oct 13, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.title / _citation_author.name

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Structure visualization

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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


Theoretical massNumber of molelcules
Total (without water)3,508,93560
Polymers3,508,93560
Non-polymers00
Water0
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: 58482.258 Da / Num. of mol.: 60
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Adeno-associated virus / Gene: cap / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q670S0

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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 / Type: VIRUS / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 4 MDa / Experimental value: NO
Source (natural)Organism: Adeno-associated virus
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Cell: SF9
Details of virusEmpty: YES / 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
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 FIELDBright-field microscopy
Image recordingElectron dose: 59 e/Å2 / Detector mode: COUNTING / Film or detector model: DIRECT ELECTRON DE-64 (8k x 8k) / Num. of real images: 1444

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Processing

SoftwareName: PHENIX / Version: 1.10-2155_2155: / Classification: refinement
EM software
IDNameCategory
4Auto3DEMCTF correction
12cisTEM3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 14778
3D reconstructionResolution: 3.35 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 9241 / Symmetry type: POINT
Atomic model buildingB value: 25 / Protocol: FLEXIBLE FIT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.01255180
ELECTRON MICROSCOPYf_angle_d0.823348120
ELECTRON MICROSCOPYf_dihedral_angle_d9.721202980
ELECTRON MICROSCOPYf_chiral_restr0.05136420
ELECTRON MICROSCOPYf_plane_restr0.00546080

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