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Citation: Dahe Yang, Jun Wang, Xi Wang, Fei Deng, Qingyun Diao, Manli Wang, Zhihong Hu, Chunsheng Hou. Genomics and Proteomics of Apis mellifera Filamentous Virus Isolated from Honeybees in China [J].VIROLOGICA SINICA.  http://dx.doi.org/10.1016/j.virs.2022.02.007

Genomics and Proteomics of Apis mellifera Filamentous Virus Isolated from Honeybees in China

  • Corresponding author: Zhihong Hu, huzh@wh.iov.cn
    Chunsheng Hou, houchunsheng@caas.cn
  • Received Date: 22 October 2021
    Accepted Date: 21 February 2022
    Published Date: 25 February 2022
  • Apis mellifera filamentous virus (AmFV) is a large DNA virus that is endemic in honeybee colonies. The genome sequence of the AmFV Swiss isolate (AmFV CH-C05) has been reported but so far very few molecular studies have been conducted on this virus. We isolated and purified AmFV (AmFV CN) from Chinese honeybee (Apis mellifera) colonies and elucidated its genomics and proteomics. Electron microscopy showed ovoid purified virions with dimensions of 300–500 × 210–285 nm, wrapping a 3165 × 40 nm filamentous nucleocapsid in three figure-eight loops. Unlike AmFV CH-C05, which was reported to have a circular genome, our data suggest that AmFV CN has a linear genome of approximately 493 kb. A total of 197 ORFs were identified, among which 36 putative genes including18 homologs were annotated. The overall nucleotide similarity between the CN and CH-C05 isolates was 96.9%. Several ORFs were newly annotated in AmFV CN, including homologs of per os infectivity factor 4 (PIF4) and a putative integrase. Phylogenomic analysis placed AmFVs on a separate branch within the newly proposed virus class Naldaviricetes. Proteomic analysis revealed 47 AmFV virion-associated proteins, of which 14 had over 50% sequence coverage, suggesting that they are likely to be main structural proteins. In addition, all six of the annotated PIFs (PIF-0–5) were identified by proteomics, suggesting that they may function as entry factors in AmFV infection. This study provides fundamental information regarding the molecular biology of AmFV.

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    Genomics and Proteomics of Apis mellifera Filamentous Virus Isolated from Honeybees in China

      Corresponding author: Zhihong Hu, huzh@wh.iov.cn
      Corresponding author: Chunsheng Hou, houchunsheng@caas.cn
    • a Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing, 100093, China
    • b State Key Laboratory of Virology and National Virus Resource Center, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, 430071, China
    • c Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, China

    Abstract: Apis mellifera filamentous virus (AmFV) is a large DNA virus that is endemic in honeybee colonies. The genome sequence of the AmFV Swiss isolate (AmFV CH-C05) has been reported but so far very few molecular studies have been conducted on this virus. We isolated and purified AmFV (AmFV CN) from Chinese honeybee (Apis mellifera) colonies and elucidated its genomics and proteomics. Electron microscopy showed ovoid purified virions with dimensions of 300–500 × 210–285 nm, wrapping a 3165 × 40 nm filamentous nucleocapsid in three figure-eight loops. Unlike AmFV CH-C05, which was reported to have a circular genome, our data suggest that AmFV CN has a linear genome of approximately 493 kb. A total of 197 ORFs were identified, among which 36 putative genes including18 homologs were annotated. The overall nucleotide similarity between the CN and CH-C05 isolates was 96.9%. Several ORFs were newly annotated in AmFV CN, including homologs of per os infectivity factor 4 (PIF4) and a putative integrase. Phylogenomic analysis placed AmFVs on a separate branch within the newly proposed virus class Naldaviricetes. Proteomic analysis revealed 47 AmFV virion-associated proteins, of which 14 had over 50% sequence coverage, suggesting that they are likely to be main structural proteins. In addition, all six of the annotated PIFs (PIF-0–5) were identified by proteomics, suggesting that they may function as entry factors in AmFV infection. This study provides fundamental information regarding the molecular biology of AmFV.

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