6IV6

Cryo-EM structure of AcrVA5-acetylated MbCas12a in complex with crRNA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

An anti-CRISPR protein disables type V Cas12a by acetylation.

Dong, L.Guan, X.Li, N.Zhang, F.Zhu, Y.Ren, K.Yu, L.Zhou, F.Han, Z.Gao, N.Huang, Z.

(2019) Nat Struct Mol Biol 26: 308-314

  • DOI: 10.1038/s41594-019-0206-1
  • Primary Citation of Related Structures:  
    6IV6, 6IUF

  • PubMed Abstract: 
  • Phages use anti-CRISPR proteins to deactivate the CRISPR-Cas system. The mechanisms for the inhibition of type I and type II systems by anti-CRISPRs have been elucidated. However, it has remained unknown how the type V CRISPR-Cas12a (Cpf1) system is inhi ...

    Phages use anti-CRISPR proteins to deactivate the CRISPR-Cas system. The mechanisms for the inhibition of type I and type II systems by anti-CRISPRs have been elucidated. However, it has remained unknown how the type V CRISPR-Cas12a (Cpf1) system is inhibited by anti-CRISPRs. Here we identify the anti-CRISPR protein AcrVA5 and report the mechanisms by which it inhibits CRISPR-Cas12a. Our structural and biochemical data show that AcrVA5 functions as an acetyltransferase to modify Moraxella bovoculi (Mb) Cas12a at Lys635, a residue that is required for recognition of the protospacer-adjacent motif. The AcrVA5-mediated modification of MbCas12a results in complete loss of double-stranded DNA (dsDNA)-cleavage activity. In contrast, the Lys635Arg mutation renders MbCas12a completely insensitive to inhibition by AcrVA5. A cryo-EM structure of the AcrVA5-acetylated MbCas12a reveals that Lys635 acetylation provides sufficient steric hindrance to prevent dsDNA substrates from binding to the Cas protein. Our study reveals an unprecedented mechanism of CRISPR-Cas inhibition and suggests an evolutionary arms race between phages and bacteria.


    Organizational Affiliation

    HIT Center for Life Sciences, School of Life Science and Technology, Harbin Institute of Technology, Harbin, China. huangzhiwei@hit.edu.cn.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
nuclease A1261Moraxella bovoculiMutation(s): 0 
Gene Names: AAX07_00205
Find proteins for A0A0U2B2X7 (Moraxella bovoculi)
Explore A0A0U2B2X7 
Go to UniProtKB:  A0A0U2B2X7
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
RNA (59-MER)G59synthetic construct
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ALY
Query on ALY
AL-PEPTIDE LINKINGC8 H16 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31825008
National Natural Science Foundation of ChinaChina31422014

Revision History 

  • Version 1.0: 2019-04-10
    Type: Initial release
  • Version 1.1: 2019-04-17
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-06
    Changes: Data collection, Other