Modularity and diversity of target selectors in Tn7 transposons.

Modularity and diversity of target selectors in Tn7 transposons.
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DOI:
10.1016/j.molcel.2023.05.013
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发表时间:
2023-06-15
期刊:
影响因子:
16
通讯作者:
Zhang, Feng
Zhang, Feng
中科院分区:
生物学1区
文献类型:
--
作者:
Faure, Guilhem;Saito, Makoto;Benler, Sean;Peng, Iris;Wolf, Yuri I.;Strecker, Jonathan;Altae-Tran, Han;Neumann, Edwin;Li, David;Makarova, Kira S.;Macrae, Rhiannon K.;V. Koonin, Eugene;Zhang, Feng

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To spread, transposons must integrate into target sites without disruption of essential genes while avoiding host defense systems. Tn7-like transposons employ multiple mechanisms for target-site selection, including protein-guided targeting and, in CRISPR-associated transposons (CASTs), RNA-guided targeting. Combining phylogenomic and structural analyses, we conducted a broad survey of target selectors, revealing diverse mechanisms used by Tn7 to recognize target sites, including previously uncharacterized target-selector proteins found in newly discovered transposable elements (TEs). We experimentally characterized a CAST I-D system and a Tn6022-like transposon that uses TnsF, which contains an inactivated tyrosine recombinase domain, to target the comM gene. Additionally, we identified a non-Tn7 transposon, Tsy, encoding a homolog of TnsF with an active tyrosine recombinase domain, which we show also inserts into comM. Our findings show that Tn7 transposons employ modular architecture and co-opt target selectors from various sources to optimize target selection and drive transposon spread. A broad survey of Tn7-like transposons clarifies their target selection strategies Type I-D CASTs transpose via both RNA-guided and protein-mediated mechanisms Transposon-encoded TnsF is a novel target selector that targets the comM gene Tsy is a tyrosine recombinase transposon that shares TnsF with Tn7-like Tn6022 Faure et al. use phylogenomic and structural approaches to systematically survey transposon target selectors, revealing a modular architecture that promotes transposon spread. Through this work, they identified a new target selector, TnsF, and a previously uncharacterized transposable element, Tsy.
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