Specific DNA-RNA Hybrid Recognition by TAL Effectors

Ping Yin, Dong Deng, Chuangye Yan, Xiaojing Pan, Jianzhong Jeff Xi, Nieng Yan, Yigong Shi

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The transcription activator-like (TAL) effector targets specific host promoter through its central DNA-binding domain, which comprises multiple tandem repeats (TALE repeats). Recent structural analyses revealed that the TALE repeats form a superhelical structure that tracks along the forward strand of the DNA duplex. Here, we demonstrate that TALE repeats specifically recognize a DNA-RNA hybrid where the DNA strand determines the binding specificity. The crystal structure of a designed TALE in complex with the DNA-RNA hybrid was determined at a resolution of 2.5 å. Although TALE repeats are in direct contact with only the DNA strand, the phosphodiester backbone of the RNA strand is inaccessible by macromolecules such as RNases. Consistent with this observation, sequence-specific recognition of an HIV-derived DNA-RNA hybrid by an engineered TALE efficiently blocked RNase H-mediated degradation of the RNA strand. Our study broadens the utility of TALE repeats and suggests potential applications in processes involving DNA replication and retroviral infections

Original languageEnglish (US)
Pages (from-to)707-713
Number of pages7
JournalCell Reports
Issue number4
StatePublished - Oct 25 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Biochemistry, Genetics and Molecular Biology


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