Abstract
Geminiviruses are plant pathogens with single-stranded (ss) DNA genomes of about 2.7 kb in size. They replicate primarily via rolling-circle replication (RCR) with the help of a few virally encoded factors and various host-cell machineries. The virally encoded replication initiator protein (Rep) is essential for geminivirus replication. In this study, by interaction screening of an Arabidopsis thaliana cDNA library, we have identified a host factor, MCM2, that interacts with the Rep protein of the geminivirus mungbean yellow mosaic India virus (MYMIV). Using yeast two-hybrid, β-galactosidase and co-immunoprecipitation assays, we demonstrated an interaction between MYMIV-Rep and the host factor AtMCM2. We investigated the possible role of AtMCM2 in geminiviral replication using a yeast-based geminivirus DNA replication restoration assay and observed that the AtMCM2 protein complemented the mcm2∆ mutation of S. cerevisiae. Our data suggest the involvement of AtMCM2 in the replication of MYMIV ex vivo. The role of MCM2 in replication was confirmed in planta by a transient replication assay in both wild-type and mutant Arabidopsis plants through agroinoculation. Our data provide evidence for the involvement of AtMCM2 in geminiviral DNA replication, presumably in conjunction with other host factors, and suggest its importance in MYMIV DNA replication.
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Abbreviations
- At :
-
Arabidopsis thaliana
- 3-AT:
-
3-Amino-1,2,4-triazole
- BSA:
-
Bovine serum albumin
- CFU:
-
Colony-forming unit
- CR:
-
Common region
- CTAB:
-
Cetyltrimethylammonium bromide
- DDK:
-
Dbf4-dependent kinase
- dpi:
-
Days post-infiltration
- ds:
-
Double-stranded
- IPTG:
-
Isopropyl β-D-thio-galactopyranoside
- LD-PCR:
-
Long-distance PCR
- MCM2-7:
-
Minichromosome maintenance protein subunits 2-7
- MYMIV:
-
Mungbean yellow mosaic India virus
- PAGE:
-
Polyacrylamide gel electrophoresis
- PBS:
-
Phosphate-buffered saline
- PCNA:
-
Proliferating cell nuclear antigen
- pre-RC:
-
Pre-replication complex
- RBR1:
-
Retinoblastoma protein 1
- RCR:
-
Rolling-circle replication
- Rep:
-
Replication initiator protein
- RF-C:
-
Replication factor C
- RPA32:
-
Replication protein A 32
- Sc :
-
Saccharomyces cerevisiae
- SD:
-
Synthetic dextrose
- SDS:
-
Sodium dodecyl sulfate
- ss:
-
Single-stranded
- ToLCV:
-
Tomato leaf curl virus
- VA:
-
Viral amplicon
- WT:
-
Wild type
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Acknowledgments
The financial support from the Department of Biotechnology (DBT), Government of India, is duly acknowledged. We thank Dr. Kosalai Kaliappan for her help in the experiments related to phage display.
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Suyal, G., Mukherjee, S.K., Srivastava, P.S. et al. Arabidopsis thaliana MCM2 plays role(s) in mungbean yellow mosaic India virus (MYMIV) DNA replication. Arch Virol 158, 981–992 (2013). https://doi.org/10.1007/s00705-012-1563-9
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DOI: https://doi.org/10.1007/s00705-012-1563-9