Abstract
A bacteriophage can replicate and release virions from a host cell in the lytic cycle or switch to a lysogenic process in which the phage integrates itself into the host genome as a prophage. In Bacillus cells, some types of phages employ the arbitrium communication system, which contains an arbitrium hexapeptide, the cellular receptor AimR and the lysogenic negative regulator AimX. This system controls the decision between the lytic and lysogenic cycles. However, both the mechanism of molecular recognition between the arbitrium peptide and AimR and how downstream gene expression is regulated remain unknown. Here, we report crystal structures for AimR from the SPbeta phage in the apo form and the arbitrium peptide-bound form at 2.20 Å and 1.92 Å, respectively. With or without the peptide, AimR dimerizes through the C-terminal capping helix. AimR assembles a superhelical fold and accommodates the peptide encircled by its tetratricopeptide repeats, which is reminiscent of RRNPP family members from the quorum-sensing system. In the absence of the arbitrium peptide, AimR targets the upstream sequence of the aimX gene; its DNA binding activity is prevented following peptide binding. In summary, our findings provide a structural basis for peptide recognition in the phage lysis–lysogeny decision communication system.
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Acknowledgements
We thank the staff of the BL17U1/BL19U1/BL19U2 beamline of the NCPSS at the Shanghai Synchrotron Radiation Facility for assistance during data collection and research associates at the Center for Protein Research, Huazhong Agricultural University, for technical support. We thank Z. Dong and Y. Deng for helpful discussions and gene disruption in prophages. We also thank Q. Tang for help with the DNA I footprinting assay. This work was supported by funds from the National Key R&D Program of China (2018YFA0507700), the National Natural Science Foundation of China (grant no. 81601742 for T.Z.) and the Fundamental Research Funds for the Central Universities (Program No. 2662014BQ028 for T.Z. and 2662017PY031 for P.Y.).
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Q.W., Z.G., P.Y., Z.L., D.P. and T.Z. designed the project and analysed data. Q.W. and Z.G. contributed to protein production and crystallization. Q.W. and K.P. performed EMSA, AUC, SLS, ITC, size-exclusion chromatography, and crosslinking and DNase I footprinting assays. Q.W., J.W. and T.Z performed gene disruption and in vivo experiments. Z.L. performed SAXS measurements. Q.W., Z.G. and T.Z. wrote the paper. All authors contributed to editing of the manuscript.
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Wang, Q., Guan, Z., Pei, K. et al. Structural basis of the arbitrium peptide–AimR communication system in the phage lysis–lysogeny decision. Nat Microbiol 3, 1266–1273 (2018). https://doi.org/10.1038/s41564-018-0239-y
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DOI: https://doi.org/10.1038/s41564-018-0239-y
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