タンパク質・ペプチド: CRISPR type I-F/YPEST-associated protein Csy2
タンパク質・ペプチド: CRISPR-associated protein Csy3
タンパク質・ペプチド: type I-F CRISPR-associated endoribonuclease Cas6/Csy4
タンパク質・ペプチド: AcrIF24
RNA: RNA (60-MER)
タンパク質・ペプチド: Type I-F CRISPR-associated protein Csy1
複合体: dsDNA
DNA: 54-MER DNA
DNA: 54-MER DNA
キーワード
complex / inhibitor / IMMUNE SYSTEM / IMMUNE SYSTEM-RNA-DNA complex
機能・相同性
CRISPR-associated protein Csy1 / CRISPR-associated protein (Cas_Csy1) / CRISPR-associated protein Csy2 / CRISPR-associated protein (Cas_Csy2) / CRISPR-associated protein Csy3 / CRISPR-associated protein (Cas_Csy3) / Uncharacterized protein / CRISPR-associated protein Csy3 / Uncharacterized protein
ジャーナル: Nat Commun / 年: 2022 タイトル: Insights into the inhibition of type I-F CRISPR-Cas system by a multifunctional anti-CRISPR protein AcrIF24. 著者: Lingguang 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 / 要旨: 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 ...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.