Hantaan virus polymerase has an in vitro Terminal Nucleotidyl Transferase activity that is conserved across the Bunyaviricetes class
- 1AFMB UMR 7257 Univ Aix-Marseille/CNRS
Abstract
Bunyaviricetes is a class of segmented negative strand RNA viruses (sNSV) that includes causative agents of severe zoonotic diseases resulting in hemorrhagic fever in humans and livestock. Hantaan virus (HTNV), family Hantaviridae, is an example of life-threatening bunyavirus transmitted by rodents which leads to Hantavirus hemorrhagic fever with renal syndrome in humans. Infection relies on the replication and transcription of their tripartite genomes through multifunctional RNA-dependent RNA polymerases (RdRp) in the context of ribonucleoproteins (RNPs) made of one viral RNA fragment, one RdRp and multiple copies of viral nucleoproteins. The RdRp, also known as L protein, performs replication by de novo initiation through a prime-and-realign mechanism while transcription initiates through a cap snatching mechanism, that engages a cap-binding domain and an endonuclease (EN) domain present in the L protein C and N terminal regions, respectively. In this work we show that HTNV L protein has a terminal nucleotidyl transferase (TNTase) activity over double-stranded RNA substrates (dsRNA) in vitro. We show that the TNTase activity is also present in other bunyaviral L proteins by comparing HTNV L protein activity with La Crosse (LACV, family Orthobunyaviridae) and Crimean Congo Hemorrhagic Fever Virus (CCHFV, family Nairoviridae) L proteins. Our results show that TNTase activity appears to be a general feature of Bunyaviruses and report the differences on substrate and nucleotide specificity for each family of virus.
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BibTeX
@misc{baratagarcia2026hantaan,
title = {{Hantaan virus polymerase has an in vitro Terminal Nucleotidyl Transferase activity that is conserved across the Bunyaviricetes class}},
author = {S. Barata-Garcia and Q. Durieux Trouilleton and C. Debarnot and H. MALET and J. Reguera},
howpublished = {bioRxiv},
year = {2026},
month = sep,
doi = {10.64898/2026.09.16.751791},
url = {https://www.biorxiv.org/content/10.64898/2026.09.16.751791v1},
note = {CC BY-NC-ND},
}
RIS
TY - UNPB
TI - Hantaan virus polymerase has an in vitro Terminal Nucleotidyl Transferase activity that is conserved across the Bunyaviricetes class
AU - S. Barata-Garcia
AU - Q. Durieux Trouilleton
AU - C. Debarnot
AU - H. MALET
AU - J. Reguera
PY - 2026
DA - 2026/09/16
PB - bioRxiv
DO - 10.64898/2026.09.16.751791
UR - https://www.biorxiv.org/content/10.64898/2026.09.16.751791v1
AB - Bunyaviricetes is a class of segmented negative strand RNA viruses (sNSV) that includes causative agents of severe zoonotic diseases resulting in hemorrhagic fever in humans and livestock. Hantaan virus (HTNV), family Hantaviridae, is an example of life-threatening bunyavirus transmitted by rodents which leads to Hantavirus hemorrhagic fever with renal syndrome in humans. Infection relies on the replication and transcription of their tripartite genomes through multifunctional RNA-dependent RNA polymerases (RdRp) in the context of ribonucleoproteins (RNPs) made of one viral RNA fragment, one RdRp and multiple copies of viral nucleoproteins. The RdRp, also known as L protein, performs replication by de novo initiation through a prime-and-realign mechanism while transcription initiates through a cap snatching mechanism, that engages a cap-binding domain and an endonuclease (EN) domain present in the L protein C and N terminal regions, respectively. In this work we show that HTNV L protein has a terminal nucleotidyl transferase (TNTase) activity over double-stranded RNA substrates (dsRNA) in vitro. We show that the TNTase activity is also present in other bunyaviral L proteins by comparing HTNV L protein activity with La Crosse (LACV, family Orthobunyaviridae) and Crimean Congo Hemorrhagic Fever Virus (CCHFV, family Nairoviridae) L proteins. Our results show that TNTase activity appears to be a general feature of Bunyaviruses and report the differences on substrate and nucleotide specificity for each family of virus.
ER -