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. 2017 Oct 10;8:1960. doi: 10.3389/fmicb.2017.01960

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Copyright © 2017 Zheng, Lu, Liang, Jiang, Zhao, Zhan, Liu, Wu and Kang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Putative slippery sites and pseudoknot structures predicted in PsVs. (A) The putative slippery sequences (XXXYYYZ) involved in -1 translational frameshift. The PsVs nucleotide sequences at –3 and +4 relative to the AUG start codon are indicated by black arrows. (B) The predicted pseudoknot structures downstream of the potential slippery sequences for –1 frameshifting are shown by yellow shadow. Spacer distance represents the number of nucleotides between the slippery site and the pseudoknot. EFE (kcal/mol) indicates the minimal free energy.