, Volume 30, Issue 1, pp 22–31 | Cite as

Recent advances in understanding the replication initiator protein of the ssDNA plant viruses of the family Nanoviridae

  • Sangita VenkataramanEmail author
  • R. SelvarajanEmail author


The families of viruses possessing single-stranded (ss) circular genome employ a dedicated replication initiator protein (Rep) for making copies of their genome through the process of rolling circle replication. The replication begins at conserved nonanucleotide sequence at the intergenic region. The Rep protein seems to be the most conserved amongst the available proteins of the nanovirids and comprises of the N-terminal endonuclease domain and the C-terminal helicase domain. The structural studies of Faba bean necrotic yellows virus endonuclease domain suggests a α + β fold comprising of central β sheet built from five antiparallel β strands surrounded by outer short α helices. The catalysis is mediated by a conserved Tyr residue and employs divalent metal ions (Mn2+). On one hand, the Reps associate with each other and oligomerize and on the other hand interact with varied host and vector associated proteins for successful infection. The sequence analysis of Reps from previously known nanovirids and the newly found ones from metagenomics data shed light on the evolutionary pattern of nanovirids in comparison to other plant infecting ssDNA viruses.


Nanoviridae Replication initiator protein Rolling circle replication Molecular phylogeny Structural motifs Interactions 


Supplementary material

13337_2019_514_MOESM1_ESM.docx (26 kb)
Supplementary material 1 (DOC 27 kb)


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Copyright information

© Indian Virological Society 2019

Authors and Affiliations

  1. 1.Department of BiotechnologyAcharya Nagarjuna UniversityGunturIndia
  2. 2.ICAR National Research Centre for BananaTiruchirapalliIndia

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