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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0061 | |||||||||
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Title | Transition state structure of Cpf1(Cas12a)I1 conformation | |||||||||
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![]() | genome editing CRISPR ribonucleoprotein complex / HYDROLASE | |||||||||
Function / homology | ![]() Bacillus subtilis ribonuclease / : / deoxyribonuclease I / deoxyribonuclease I activity / defense response to virus / lyase activity / DNA binding / RNA binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.91 Å | |||||||||
![]() | Mesa P / Montoya G | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Conformational Activation Promotes CRISPR-Cas12a Catalysis and Resetting of the Endonuclease Activity. Authors: Stefano Stella / Pablo Mesa / Johannes Thomsen / Bijoya Paul / Pablo Alcón / Simon B Jensen / Bhargav Saligram / Matias E Moses / Nikos S Hatzakis / Guillermo Montoya / ![]() Abstract: Cas12a, also known as Cpf1, is a type V-A CRISPR-Cas RNA-guided endonuclease that is used for genome editing based on its ability to generate specific dsDNA breaks. Here, we show cryo-EM structures ...Cas12a, also known as Cpf1, is a type V-A CRISPR-Cas RNA-guided endonuclease that is used for genome editing based on its ability to generate specific dsDNA breaks. Here, we show cryo-EM structures of intermediates of the cleavage reaction, thus visualizing three protein regions that sense the crRNA-DNA hybrid assembly triggering the catalytic activation of Cas12a. Single-molecule FRET provides the thermodynamics and kinetics of the conformational activation leading to phosphodiester bond hydrolysis. These findings illustrate why Cas12a cuts its target DNA and unleashes unspecific cleavage activity, degrading ssDNA molecules after activation. In addition, we show that other crRNAs are able to displace the R-loop inside the protein after target DNA cleavage, terminating indiscriminate ssDNA degradation. We propose a model whereby the conformational activation of the enzyme results in indiscriminate ssDNA cleavage. The displacement of the R-loop by a new crRNA molecule will reset Cas12a specificity, targeting new DNAs. | |||||||||
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 | ![]() | 34.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 15.2 KB 15.2 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 8.6 KB | Display | ![]() |
Images | ![]() | 141.2 KB | ||
Filedesc metadata | ![]() | 6.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6gtcMC ![]() 0062C ![]() 0063C ![]() 0064C ![]() 0065C ![]() 6gtdC ![]() 6gteC ![]() 6gtfC ![]() 6gtgC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.832 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 : Transition state complex I1 conformation
Entire | Name: Transition state complex I1 conformation |
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Components |
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-Supramolecule #1: Transition state complex I1 conformation
Supramolecule | Name: Transition state complex I1 conformation / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Molecular weight | Theoretical: 180 KDa |
-Supramolecule #2: CRISPR-associated endonuclease Cas12a
Supramolecule | Name: CRISPR-associated endonuclease Cas12a / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: RNA (28-mer)
Supramolecule | Name: RNA (28-mer) / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2 |
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Source (natural) | Organism: ![]() |
-Supramolecule #4: DNA
Supramolecule | Name: DNA / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #3-#4 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: CRISPR-associated endonuclease Cas12a
Macromolecule | Name: CRISPR-associated endonuclease Cas12a / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: deoxyribonuclease I |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 155.639828 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSIYQEFVNK YSLSKTLRFE LIPQGKTLEN IKARGLILDD EKRAKDYKKA KQIIDKYHQF FIEEILSSVC ISEDLLQNYS DVYFKLKKS DDDNLQKDFK SAKDTIKKQI SEYIKDSEKF KNLFNQNLID AKKGQESDLI LWLKQSKDNG IELFKANSDI T DIDEALEI ...String: MSIYQEFVNK YSLSKTLRFE LIPQGKTLEN IKARGLILDD EKRAKDYKKA KQIIDKYHQF FIEEILSSVC ISEDLLQNYS DVYFKLKKS DDDNLQKDFK SAKDTIKKQI SEYIKDSEKF KNLFNQNLID AKKGQESDLI LWLKQSKDNG IELFKANSDI T DIDEALEI IKSFKGWTTY FKGFHENRKN VYSSNDIPTS IIYRIVDDNL PKFLENKAKY ESLKDKAPEA INYEQIKKDL AE ELTFDID YKTSEVNQRV FSLDEVFEIA NFNNYLNQSG ITKFNTIIGG KFVNGENTKR KGINEYINLY SQQINDKTLK KYK MSVLFK QILSDTESKS FVIDKLEDDS DVVTTMQSFY EQIAAFKTVE EKSIKETLSL LFDDLKAQKL DLSKIYFKND KSLT DLSQQ VFDDYSVIGT AVLEYITQQI APKNLDNPSK KEQELIAKKT EKAKYLSLET IKLALEEFNK HRDIDKQCRF EEILA NFAA IPMIFDEIAQ NKDNLAQISI KYQNQGKKDL LQASAEDDVK AIKDLLDQTN NLLHKLKIFH ISQSEDKANI LDKDEH FYL VFEECYFELA NIVPLYNKIR NYITQKPYSD EKFKLNFENS TLANGWDKNK EPDNTAILFI KDDKYYLGVM NKKNNKI FD DKAIKENKGE GYKKIVYKLL PGANKMLPKV FFSAKSIKFY NPSEDILRIR NHSTHTKNGS PQKGYEKFEF NIEDCRKF I DFYKQSISKH PEWKDFGFRF SDTQRYNSID EFYREVENQG YKLTFENISE SYIDSVVNQG KLYLFQIYNK DFSAYSKGR PNLHTLYWKA LFDERNLQDV VYKLNGEAEL FYRKQSIPKK ITHPAKEAIA NKNKDNPKKE SVFEYDLIKD KRFTEDKFFF HCPITINFK SSGANKFNDE INLLLKEKAN DVHILSIDRG ERHLAYYTLV DGKGNIIKQD TFNIIGNDRM KTNYHDKLAA I EKDRDSAR KDWKKINNIK EMKEGYLSQV VHEIAKLVIE YNAIVVFQDL NFGFKRGRFK VEKQVYQKLE KMLIEKLNYL VF KDNEFDK TGGVLRAYQL TAPFETFKKM GKQTGIIYYV PAGFTSKICP VTGFVNQLYP KYESVSKSQE FFSKFDKICY NLD KGYFEF SFDYKNFGDK AAKGKWTIAS FGSRLINFRN SDKNHNWDTR EVYPTKELEK LLKDYSIEYG HGECIKAAIC GESD KKFFA KLTSVLNTIL QMRNSKTGTE LDYLISPVAD VNGNFFDSRQ APKNMPQDAD ANGAYHIGLK GLMLLGRIKN NQEGK KLNL VIKNEEYFEF VQNRNNGSEF ELENLYFQGE LRRQASALEH HHHHH UniProtKB: CRISPR-associated endonuclease Cas12a |
-Macromolecule #2: RNA (28-MER)
Macromolecule | Name: RNA (28-MER) / type: rna / ID: 2 / Number of copies: 1 |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 13.749146 KDa |
Sequence | String: AAUUUCUACU GUUGUAGAUG AGAAGUCAUU UAAUAAGGCC ACU |
-Macromolecule #3: DNA (5'-D(P*TP*GP*AP*CP*TP*TP*CP*TP*CP*TP*AP*AP*CP*AP*AP*GP*CP*TP...
Macromolecule | Name: DNA (5'-D(P*TP*GP*AP*CP*TP*TP*CP*TP*CP*TP*AP*AP*CP*AP*AP*GP*CP*TP*CP*G)-3') type: dna / ID: 3 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 16.898826 KDa |
Sequence | String: (DA)(DT)(DT)(DG)(DC)(DT)(DT)(DG)(DC)(DT) (DC)(DG)(DA)(DT)(DG)(DC)(DA)(DT)(DG)(DC) (DA)(DG)(DT)(DG)(DG)(DC)(DC)(DT)(DT) (DA)(DT)(DT)(DA)(DA)(DA)(DT)(DG)(DA)(DC) (DT) (DT)(DC)(DT)(DC)(DT)(DA) ...String: (DA)(DT)(DT)(DG)(DC)(DT)(DT)(DG)(DC)(DT) (DC)(DG)(DA)(DT)(DG)(DC)(DA)(DT)(DG)(DC) (DA)(DG)(DT)(DG)(DG)(DC)(DC)(DT)(DT) (DA)(DT)(DT)(DA)(DA)(DA)(DT)(DG)(DA)(DC) (DT) (DT)(DC)(DT)(DC)(DT)(DA)(DA)(DC) (DG)(DA)(DG)(DC)(DT)(DC)(DG) |
-Macromolecule #4: DNA (5'-D(P*CP*GP*AP*GP*CP*TP*CP*GP*TP*TP*AP*GP*AP*GP*AP*AP*G)-3')
Macromolecule | Name: DNA (5'-D(P*CP*GP*AP*GP*CP*TP*CP*GP*TP*TP*AP*GP*AP*GP*AP*AP*G)-3') type: dna / ID: 4 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 16.992936 KDa |
Sequence | String: (DC)(DG)(DA)(DG)(DC)(DT)(DC)(DG)(DT)(DT) (DA)(DG)(DA)(DG)(DA)(DA)(DG)(DT)(DC)(DA) (DT)(DT)(DT)(DA)(DA)(DT)(DA)(DA)(DG) (DG)(DC)(DC)(DA)(DC)(DT)(DG)(DC)(DA)(DT) (DG) (DC)(DA)(DT)(DC)(DG)(DA) ...String: (DC)(DG)(DA)(DG)(DC)(DT)(DC)(DG)(DT)(DT) (DA)(DG)(DA)(DG)(DA)(DA)(DG)(DT)(DC)(DA) (DT)(DT)(DT)(DA)(DA)(DT)(DA)(DA)(DG) (DG)(DC)(DC)(DA)(DC)(DT)(DG)(DC)(DA)(DT) (DG) (DC)(DA)(DT)(DC)(DG)(DA)(DG)(DC) (DA)(DA)(DG)(DC)(DA)(DA)(DT) |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7 |
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Grid | Material: COPPER / Pretreatment - Type: GLOW DISCHARGE |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |