Abstract
Leader sequence, located at the 3′ terminus of paramyxovirus genomes, determines the degree of viral transcription and replication. The essential nucleotides in the leader sequence that influence viral propagation, however, have not been investigated in detail. In the present study, we show that polymerase complex of human parainfluenza virus type 2 (hPIV2) uses a luciferase-encoding hPIV2 mini-genome possessing the leader sequence from other closely related viruses as a template. Furthermore, we demonstrate that although hPIV2 polymerase complex can recognize the leader sequence of hPIV4B, mumps virus (MuV) and PIV5 as well as Newcastle disease virus (NDV), it cannot recognize measles virus, hPIV1, Sendai virus (SeV) or hPIV3. We could obtain the chimeric hPIV2 possessing the leader sequence from hPIV4B, MuV and PIV5, but not from other species, including NDV and SeV. These results reveal that although hPIV2 polymerase complex can recognize the leader sequence from rubulaviruses to achieve efficient viral infection, this does not apply to viruses belonging to other genus. A comparison of leader sequence nucleotides among paramyxoviruses highlights the importance of the conservation in the first 13 nucleotides for infectious hPIV2 growth.
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Acknowledgements
We thank Natsuko Yumine, Ryo Kanehisa and Yuki Naka, Wakayama Medical University, for helping with experiments. This work was supported by Grant-in-Aid Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan (16K19143).
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Matsumoto, Y., Ohta, K. & Nishio, M. Human parainfluenza virus type 2 polymerase complex recognizes leader promoters of other species belonging to the genus Rubulavirus . Med Microbiol Immunol 206, 441–446 (2017). https://doi.org/10.1007/s00430-017-0520-3
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DOI: https://doi.org/10.1007/s00430-017-0520-3