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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-21367 | |||||||||
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Title | Cryo-EM structure of Cas13(crRNA) | |||||||||
![]() | Cas13(crRNA) | |||||||||
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![]() | CRISPR-Cas system / Cas13 / IMMUNE SYSTEM / TypeVI | |||||||||
Function / homology | : / endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / RNA binding / CRISPR-associated endoribonuclease Cas13a![]() | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Jia N / Meeske AJ | |||||||||
![]() | ![]() Title: A phage-encoded anti-CRISPR enables complete evasion of type VI-A CRISPR-Cas immunity. Authors: Alexander J Meeske / Ning Jia / Alice K Cassel / Albina Kozlova / Jingqiu Liao / Martin Wiedmann / Dinshaw J Patel / Luciano A Marraffini / ![]() Abstract: The CRISPR RNA (crRNA)-guided nuclease Cas13 recognizes complementary viral transcripts to trigger the degradation of both host and viral RNA during the type VI CRISPR-Cas antiviral response. ...The CRISPR RNA (crRNA)-guided nuclease Cas13 recognizes complementary viral transcripts to trigger the degradation of both host and viral RNA during the type VI CRISPR-Cas antiviral response. However, how viruses can counteract this immunity is not known. We describe a listeriaphage (ϕLS46) encoding an anti-CRISPR protein (AcrVIA1) that inactivates the type VI-A CRISPR system of Using genetics, biochemistry, and structural biology, we found that AcrVIA1 interacts with the guide-exposed face of Cas13a, preventing access to the target RNA and the conformational changes required for nuclease activation. Unlike inhibitors of DNA-cleaving Cas nucleases, which cause limited immunosuppression and require multiple infections to bypass CRISPR defenses, a single dose of AcrVIA1 delivered by an individual virion completely dismantles type VI-A CRISPR-mediated immunity. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 2.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 11.6 KB 11.6 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 7 KB | Display | ![]() |
Images | ![]() | 71.8 KB | ||
Filedesc metadata | ![]() | 5.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6vrcMC ![]() 6vrbC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Cas13(crRNA) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.08 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Cas13-crRNA complex
Entire | Name: Cas13-crRNA complex |
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Components |
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-Supramolecule #1: Cas13-crRNA complex
Supramolecule | Name: Cas13-crRNA complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 130 KDa |
-Macromolecule #1: CRISPR-associated endoribonuclease Cas13a
Macromolecule | Name: CRISPR-associated endoribonuclease Cas13a / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: Hydrolases; Acting on ester bonds |
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Source (natural) | Organism: ![]() Strain: ATCC 35967 / DSM 20751 / CIP 100100 / SLCC 3954 |
Molecular weight | Theoretical: 133.295297 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MWISIKTLIH HLGVLFFCDY MYNRREKKII EVKTMRITKV EVDRKKVLIS RDKNGGKLVY ENEMQDNTEQ IMHHKKSSFY KSVVNKTIC RPEQKQMKKL VHGLLQENSQ EKIKVSDVTK LNISNFLNHR FKKSLYYFPE NSPDKSEEYR IEINLSQLLE D SLKKQQGT ...String: MWISIKTLIH HLGVLFFCDY MYNRREKKII EVKTMRITKV EVDRKKVLIS RDKNGGKLVY ENEMQDNTEQ IMHHKKSSFY KSVVNKTIC RPEQKQMKKL VHGLLQENSQ EKIKVSDVTK LNISNFLNHR FKKSLYYFPE NSPDKSEEYR IEINLSQLLE D SLKKQQGT FICWESFSKD MELYINWAEN YISSKTKLIK KSIRNNRIQS TESRSGQLMD RYMKDILNKN KPFDIQSVSE KY QLEKLTS ALKATFKEAK KNDKEINYKL KSTLQNHERQ IIEELKENSE LNQFNIEIRK HLETYFPIKK TNRKVGDIRN LEI GEIQKI VNHRLKNKIV QRILQEGKLA SYEIESTVNS NSLQKIKIEE AFALKFINAC LFASNNLRNM VYPVCKKDIL MIGE FKNSF KEIKHKKFIR QWSQFFSQEI TVDDIELASW GLRGAIAPIR NEIIHLKKHS WKKFFNNPTF KVKKSKIING KTKDV TSEF LYKETLFKDY FYSELDSVPE LIINKMESSK ILDYYSSDQL NQVFTIPNFE LSLLTSAVPF APSFKRVYLK GFDYQN QDE AQPDYNLKLN IYNEKAFNSE AFQAQYSLFK MVYYQVFLPQ FTTNNDLFKS SVDFILTLNK ERKGYAKAFQ DIRKMNK DE KPSEYMSYIQ SQLMLYQKKQ EEKEKINHFE KFINQVFIKG FNSFIEKNRL TYICHPTKNT VPENDNIEIP FHTDMDDS N IAFWLMCKLL DAKQLSELRN EMIKFSCSLQ STEEISTFTK AREVIGLALL NGEKGCNDWK ELFDDKEAWK KNMSLYVSE ELLQSLPYTQ EDGQTPVINR SIDLVKKYGT ETILEKLFSS SDDYKVSAKD IAKLHEYDVT EKIAQQESLH KQWIEKPGLA RDSAWTKKY QNVINDISNY QWAKTKVELT QVRHLHQLTI DLLSRLAGYM SIADRDFQFS SNYILERENS EYRVTSWILL S ENKNKNKY NDYELYNLKN ASIKVSSKND PQLKVDLKQL RLTLEYLELF DNRLKEKRNN ISHFNYLNGQ LGNSILELFD DA RDVLSYD RKLKNAVSKS LKEILSSHGM EVTFKPLYQT NHHLKIDKLQ PKKIHHLGEK STVSSNQVSN EYCQLVRTLL TMK HHHHHH UniProtKB: CRISPR-associated endoribonuclease Cas13a |
-Macromolecule #2: RNA (51-MER)
Macromolecule | Name: RNA (51-MER) / type: rna / ID: 2 / Number of copies: 1 |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 19.049383 KDa |
Sequence | String: GACUACCUCU AUAUGAAAGA GGACUAAAAC CAUAUUUCCA AACUCCACUU UGACUACACC GENBANK: GENBANK: FN557490.1 |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.5 mg/mL |
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Buffer | pH: 7.5 / Component - Formula: Tris / Details: 20 mM Tris, pH 7.5, 150 mM NaCl, 2 mM DTT |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 1.23 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |