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TitleInsights into the inhibition of type I-F CRISPR-Cas system by a multifunctional anti-CRISPR protein AcrIF24.
Journal, issue, pagesNat Commun, Vol. 13, Issue 1, Page 1931, Year 2022
Publish dateApr 11, 2022
AuthorsLingguang Yang / Laixing Zhang / Peipei Yin / Hao Ding / Yu Xiao / Jianwei Zeng / Wenhe Wang / Huan Zhou / Qisheng Wang / Yi Zhang / Zeliang Chen / Maojun Yang / Yue Feng /
PubMed AbstractCRISPR-Cas systems are prokaryotic adaptive immune systems and phages use anti-CRISPR proteins (Acrs) to counteract these systems. Here, we report the structures of AcrIF24 and its complex with the ...CRISPR-Cas systems are prokaryotic adaptive immune systems and phages use anti-CRISPR proteins (Acrs) to counteract these systems. Here, we report the structures of AcrIF24 and its complex with the crRNA-guided surveillance (Csy) complex. The HTH motif of AcrIF24 can bind the Acr promoter region and repress its transcription, suggesting its role as an Aca gene in self-regulation. AcrIF24 forms a homodimer and further induces dimerization of the Csy complex. Apart from blocking the hybridization of target DNA to the crRNA, AcrIF24 also induces the binding of non-sequence-specific dsDNA to the Csy complex, similar to AcrIF9, although this binding seems to play a minor role in AcrIF24 inhibitory capacity. Further structural and biochemical studies of the Csy-AcrIF24-dsDNA complexes and of AcrIF24 mutants reveal that the HTH motif of AcrIF24 and the PAM recognition loop of the Csy complex are structural elements essential for this non-specific dsDNA binding. Moreover, AcrIF24 and AcrIF9 display distinct characteristics in inducing non-specific DNA binding. Together, our findings highlight a multifunctional Acr and suggest potential wide distribution of Acr-induced non-specific DNA binding.
External linksNat Commun / PubMed:35411005 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution2.1 - 3.2 Å
Structure data

31185

7elm

EMDB-31185, PDB-7elm:
Structure of Csy-AcrIF24
Method: EM (single particle) / Resolution: 2.88 Å

31186

7eln

EMDB-31186, PDB-7eln:
Structure of Csy-AcrIF24-dsDNA
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-32387: Csy1 region of the Csy-AcrIF24-dsDNA(non-sequence-specific) complex
Method: EM (single particle) / Resolution: 3.2 Å

32440

7we6

EMDB-32440, PDB-7we6:
Structure of Csy-AcrIF24-dsDNA
Method: EM (single particle) / Resolution: 3.2 Å

PDB-7dtr:
Structure of an AcrIF protein
Method: X-RAY DIFFRACTION / Resolution: 2.1 Å

Chemicals

ChemComp-HOH:
WATER

Source
  • pseudomonas aeruginosa (bacteria)
KeywordsVIRAL PROTEIN / HTH motif / protein interaction / IMMUNE SYSTEM/RNA / complex / inhibitor / IMMUNE SYSTEM / IMMUNE SYSTEM-RNA complex / IMMUNE SYSTEM/RNA/DNA / IMMUNE SYSTEM-RNA-DNA complex

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