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Characterization of the endonuclease activity of the replication-associated protein of beak and feather disease virus

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Abstract

Beak and feather disease virus (BFDV) belongs to the family Circoviridae. A rolling-circle replication strategy based on a replication-associated protein (Rep) has been proposed for BFDV. The Rep gene of BFDV was expressed and purified, and it was shown to cleave short oligonucleotides containing the conserved nonanucleotide sequence found in the replication origin of circoviruses. This endonuclease activity was most efficient in the presence of the divalent metal ions Mg2+ and Mn2+. Rep proteins containing mutation in the ATPase/GTPase motifs and the 14FTLNN18, 61KKRLS65, 89YCSK92, and 170GKS172 motifs lacked endonuclease activity. The endonuclease activity was not affected by ATPase inhibitors, with the exception of N-ethylmaleimide (NEM), or by GTPase inhibitors, but it was decreased by treatment with the endonuclease inhibitor L-742001. Both the ATPase and GTPase activities were decreased by site-directed mutagenesis and deletion of the ATPase/GTPase and endonuclease motifs. The Rep protein was able to bind a double-stranded DNA fragment of P36 (dsP36) containing the stem-loop structure of the replication origin of BFDV. All of the Rep mutant proteins showed reduced ability to bind this fragment, suggesting that all the ATPase/GTPase and endonuclease motifs are involved in the binding. Other than NEM, all ATPase, GTPase, and endonuclease inhibitors inhibited the binding of the Rep protein to the dsP36 fragment. This is the first report describing the endonuclease activity of the Rep protein of BFDV.

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Acknowledgements

This work was supported by Grants from the Ministry of Science and Technology, Taiwan (MOST 105-2313-B-005-030 and MOST 106-2313-B-005-053-MY3), and the iEGG and Animal Biotechnology Center from the Feature Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education in Taiwan.

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Correspondence to Chi-Young Wang.

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Supplementary Fig. 1

Expression and purification of the SUMO-Rep and Rep proteins using the recombinant pETite N-His SUMO Kan plasmid. M, molecular weight marker. Proteins from bacterial lysates of the expressed SUMO-Rep without (−) (lane 1) and with (+) IPTG-induction (lane 2) and the purified SUMO-Rep (lane 3) were resolved using SDS-PAGE (A). The Rep protein, after the removal of the SUMO-tag, was analyzed using SDS-PAGE (B). The Rep protein was probed with anti-Rep monoclonal antibody by Western blotting (C) (PDF 97 kb)

Supplementary Fig. 2

(A) The untagged Rep protein cleaves and covalently binds the P10 and P12 oligonucleotides through its endonuclease activity. The red arrowheads indicate the Rep protein-oligonucleotides adducts. M, molecular weight markers. (B) The replication origin of BFDV with a stem-loop structure followed by two repeated iteron sequences (5′-GGGGCACC/T-3′) is shown. The dsDNA as probes in the EMSA assay are indicated by a grey shading for dsP36 and by double arrows for dsP16 and dsP26, and the nucleotide numbers are indicated. (C) binding of the Rep protein without the tag to the dsP36 fragment, as measured by EMSA. The arrowheads and asterisks indicate the free probes and the Rep-dsP36 complexes, respectively (PDF 52 kb)

Supplementary Fig. 3

The endonuclease activities of the Rep Δ51-55 (Rep-box-2-del) and Rep Y55A (Rep-box-2-mut) proteins for both P10 and P12 oligonucleotides are lower than that of the Rep protein. The red arrowheads indicate the Rep protein-oligonucleotides adducts (A). The relative ATPase (B) and GTPase (C) activities of the Rep Δ51-55 (Rep-box-2-del) protein and Rep Y55A (Rep-box-2-mut) protein are higher than that of the Rep protein. The relative ATPase and GTPase activities of the Rep protein were set as 100%, and significant differences are indicated by a p-value of <0.05. The Rep Δ51-55 (Rep-box-2-del) protein and Rep Y55A (Rep-box-2-mut) protein showed stronger binding to the dsP36 DNA when compared to the Rep protein (D). The arrowheads and asterisks indicate the free probes and the Rep-dsP36 complexes, respectively (PDF 244 kb)

Supplementary material 4 (DOCX 16 kb)

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Chen, JK., Hsiao, C., Wu, JS. et al. Characterization of the endonuclease activity of the replication-associated protein of beak and feather disease virus. Arch Virol 164, 2091–2106 (2019). https://doi.org/10.1007/s00705-019-04292-z

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  • DOI: https://doi.org/10.1007/s00705-019-04292-z

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