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- PDB-6qxt: Cas1-Cas2-Csn2-DNA dimer complex from the Type II-A CRISPR-Cas system -

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Basic information

Entry
Database: PDB / ID: 6qxt
TitleCas1-Cas2-Csn2-DNA dimer complex from the Type II-A CRISPR-Cas system
Components
  • (CRISPR-associated ...) x 3
  • (DNA (64-MER)) x 2
KeywordsDNA BINDING PROTEIN / CRISPR / Cas / DNA binding / Nuclease / Adaptation / Spacer acquisition / Protein complex / Protein-DNA complex / Calcium / Metal-binding / Antiviral
Function / homology
Function and homology information


maintenance of CRISPR repeat elements / RNA endonuclease activity / DNA endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / DNA binding / metal ion binding
Similarity search - Function
CRISPR-associated protein, Csn2-type / CRISPR-associated protein Csn2 superfamily / CRISPR-associated protein (Cas_Csn2) / CRISPR-associated protein Cas1, NMENI subtype / CRISPR-associated endonuclease Cas2 / Virulence-associated protein D / CRISPR associated protein Cas2 / CRISPR associated protein Cas2 / : / CRISPR-associated protein Cas1 / CRISPR-associated endonuclease Cas1, C-terminal domain / CRISPR associated protein Cas1
Similarity search - Domain/homology
DNA / DNA (> 10) / CRISPR-associated endonuclease Cas1 / CRISPR-associated endoribonuclease Cas2 / CRISPR-associated protein Csn2
Similarity search - Component
Biological speciesStreptococcus thermophilus (bacteria)
Escherichia coli BL21 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 8.9 Å
AuthorsWilkinson, M. / Drabavicius, G. / Silanskas, A. / Gasiunas, G. / Siksnys, V. / Wigley, D.B.
CitationJournal: Mol Cell / Year: 2019
Title: Structure of the DNA-Bound Spacer Capture Complex of a Type II CRISPR-Cas System.
Authors: Martin Wilkinson / Gediminas Drabavicius / Arunas Silanskas / Giedrius Gasiunas / Virginijus Siksnys / Dale B Wigley /
Abstract: CRISPR and associated Cas proteins function as an adaptive immune system in prokaryotes to combat bacteriophage infection. During the immunization step, new spacers are acquired by the CRISPR ...CRISPR and associated Cas proteins function as an adaptive immune system in prokaryotes to combat bacteriophage infection. During the immunization step, new spacers are acquired by the CRISPR machinery, but the molecular mechanism of spacer capture remains enigmatic. We show that the Cas9, Cas1, Cas2, and Csn2 proteins of a Streptococcus thermophilus type II-A CRISPR-Cas system form a complex and provide cryoelectron microscopy (cryo-EM) structures of three different assemblies. The predominant form, with the stoichiometry Cas1-Cas2-Csn2, referred to as monomer, contains ∼30 bp duplex DNA bound along a central channel. A minor species, termed a dimer, comprises two monomers that sandwich a further eight Cas1 and four Cas2 subunits and contains two DNA ∼30-bp duplexes within the channel. A filamentous form also comprises Cas1-Cas2-Csn2 units (typically 2-6) but with a different Cas1-Cas2 interface between them and a continuous DNA duplex running along a central channel.
History
DepositionMar 8, 2019Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 8, 2019Provider: repository / Type: Initial release
Revision 1.1May 22, 2019Group: Data collection / Database references
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_database_proc / pdbx_seq_map_depositor_info
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed ..._citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _em_admin.last_update / _pdbx_seq_map_depositor_info.one_letter_code_mod
Revision 1.2Jul 24, 2019Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3May 15, 2024Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

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Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: CRISPR-associated protein Csn2
B: CRISPR-associated protein Csn2
C: CRISPR-associated protein Csn2
D: CRISPR-associated protein Csn2
E: CRISPR-associated protein Csn2
F: CRISPR-associated protein Csn2
G: CRISPR-associated protein Csn2
H: CRISPR-associated protein Csn2
I: CRISPR-associated endonuclease Cas1
J: CRISPR-associated endonuclease Cas1
K: CRISPR-associated endoribonuclease Cas2
L: CRISPR-associated endonuclease Cas1
M: CRISPR-associated endonuclease Cas1
N: CRISPR-associated endoribonuclease Cas2
O: CRISPR-associated endonuclease Cas1
P: CRISPR-associated endonuclease Cas1
Q: CRISPR-associated endoribonuclease Cas2
R: CRISPR-associated endonuclease Cas1
S: CRISPR-associated endonuclease Cas1
T: CRISPR-associated endoribonuclease Cas2
U: CRISPR-associated endonuclease Cas1
V: CRISPR-associated endonuclease Cas1
W: CRISPR-associated endoribonuclease Cas2
X: CRISPR-associated endoribonuclease Cas2
Y: CRISPR-associated endonuclease Cas1
Z: CRISPR-associated endonuclease Cas1
a: CRISPR-associated protein Csn2
b: CRISPR-associated protein Csn2
c: CRISPR-associated protein Csn2
d: CRISPR-associated protein Csn2
e: CRISPR-associated protein Csn2
f: CRISPR-associated protein Csn2
g: CRISPR-associated protein Csn2
h: CRISPR-associated protein Csn2
i: CRISPR-associated endonuclease Cas1
j: CRISPR-associated endonuclease Cas1
k: CRISPR-associated endoribonuclease Cas2
l: CRISPR-associated endonuclease Cas1
m: CRISPR-associated endonuclease Cas1
n: CRISPR-associated endoribonuclease Cas2
o: CRISPR-associated endonuclease Cas1
p: CRISPR-associated endonuclease Cas1
q: CRISPR-associated endoribonuclease Cas2
r: CRISPR-associated endonuclease Cas1
s: CRISPR-associated endonuclease Cas1
t: CRISPR-associated endoribonuclease Cas2
u: CRISPR-associated endonuclease Cas1
v: CRISPR-associated endonuclease Cas1
w: CRISPR-associated endoribonuclease Cas2
x: CRISPR-associated endoribonuclease Cas2
y: CRISPR-associated endonuclease Cas1
z: CRISPR-associated endonuclease Cas1
1: DNA (64-MER)
2: DNA (64-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,458,50270
Polymers1,457,86154
Non-polymers64116
Water00
1


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

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Components

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CRISPR-associated ... , 3 types, 52 molecules ABCDEFGHabcdefghIJLMOPRSUVYZij...

#1: Protein
CRISPR-associated protein Csn2


Mass: 25533.473 Da / Num. of mol.: 16
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptococcus thermophilus (bacteria) / Gene: csn2 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: G3ECR4
#2: Protein ...
CRISPR-associated endonuclease Cas1


Mass: 35363.461 Da / Num. of mol.: 24 / Mutation: C-terminal Strep tag
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptococcus thermophilus (bacteria) / Gene: cas1 / Production host: Escherichia coli BL21(DE3) (bacteria)
References: UniProt: G3ECR2, Hydrolases; Acting on ester bonds
#3: Protein
CRISPR-associated endoribonuclease Cas2


Mass: 13431.560 Da / Num. of mol.: 12
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptococcus thermophilus (bacteria) / Gene: cas2 / Production host: Escherichia coli BL21(DE3) (bacteria)
References: UniProt: G3ECR3, Hydrolases; Acting on ester bonds

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DNA chain , 2 types, 2 molecules 12

#4: DNA chain DNA (64-MER)


Mass: 19423.369 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Details: Mixed sequences of cell DNA fragments bound represented as poly(A)
Source: (natural) Escherichia coli BL21(DE3) (bacteria)
#5: DNA chain DNA (64-MER)


Mass: 20000.281 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Details: Mixed sequences of cell DNA fragments bound represented as poly(T)
Source: (natural) Escherichia coli BL21(DE3) (bacteria)

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Non-polymers , 1 types, 16 molecules

#6: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 16 / Source method: obtained synthetically / Formula: Ca

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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-IDSourceDetails
1Cas1-Cas2-Csn2-DNA monomer complexCOMPLEX#1-#50MULTIPLE SOURCES
2Cas1-Cas2-Csn2COMPLEX#1-#31RECOMBINANTRepresents a small proportion of the Cas1-Cas2-Csn2-DNA particles.
3DNACOMPLEX#4-#51NATURAL
Molecular weightValue: 1.4 MDa / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Streptococcus thermophilus (bacteria)1308
33Escherichia coli BL21(DE3) (bacteria)469008
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.5 / Details: Buffer solution was filtered
Buffer component
IDConc.NameFormulaBuffer-ID
125 mMTris1
2150 mMSodium chlorideNaCl1
31 mMTCEP1
SpecimenConc.: 0.05 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Sample was DNaseI treated followed by gel filtration. Peak fractions were concentrated prior to making grids.
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 277 K / Details: 15 s wait time, 1 s blot time.

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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 / Nominal magnification: 75000 X / Calibrated magnification: 129032 X / Nominal defocus max: 2800 nm / Nominal defocus min: 1300 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1 sec. / Electron dose: 92.8 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 4908 / Details: Images were collected in movie mode with 39 frames
Image scansSampling size: 14 µm

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Processing

EM software
IDNameVersionCategory
2EPUimage acquisition
4GctfCTF correction
7UCSF Chimeramodel fitting
8Cootmodel fitting
10RELION3initial Euler assignment
11RELION3final Euler assignment
12RELION3classification
13RELION33D reconstruction
14Cootmodel refinement
15REFMACmodel refinement
16PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 426924
Details: Reproductions of an initial ab initio generated 3D reconstruction were used as templates for auto picking. Most of the picked particles were monomers or filament particles that were later excluded
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 8.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 3109 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Target criteria: Correlation coefficient and visual inspection
Details: Rounds of manual fitting in Coot, jelly-body refinement in REFMAC and rigid-body refinement in PHENIX
Atomic model building

3D fitting-ID: 1 / Source name: PDB / Type: experimental model

IDPDB-IDPdb chain-IDAccession codeInitial refinement model-IDPdb chain residue range
16QXF

6qxf

A6QXF1
26QXF

6qxf

B6QXF1
36XQF

6xqf

I6XQF2
46XQF

6xqf

J6XQF2
56XQF

6xqf

K6XQF2100-110
65ZYF

5zyf

A5ZYF3

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