The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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The Crucial Role of Chloroplast-Related Proteins in Viral Genome Replication and Host Defense against Positive-Sense Single-Stranded RNA Viruses

  • John, Bwalya (Department of Agriculture Biotechnology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Kook-Hyung, Kim (Department of Agriculture Biotechnology, College of Agriculture and Life Sciences, Seoul National University)
  • Received : 2022.10.04
  • Accepted : 2022.12.22
  • Published : 2023.02.01
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Abstract

Plant viruses are responsible for worldwide production losses of numerous economically important crops. The most common plant RNA viruses are positivesense single-stranded RNA viruses [(+)ss RNA viruses]. These viruses have small genomes that encode a limited number of proteins. The viruses depend on their host's machinery for the replication of their RNA genome, assembly, movement, and attraction to the vectors for dispersal. Recently researchers have reported that chloroplast proteins are crucial for replicating (+)ss plant RNA viruses. Some chloroplast proteins, including translation initiation factor [eIF(iso)4E] and 75 DEAD-box RNA helicase RH8, help viruses fulfill their infection cycle in plants. In contrast, other chloroplast proteins such as PAP2.1, PSaC, and ATPsyn-α play active roles in plant defense against viruses. This is also consistent with the idea that reactive oxygen species, salicylic acid, jasmonic acid, and abscisic acid are produced in chloroplast. However, knowledge of molecular mechanisms and functions underlying these chloroplast host factors during the virus infection is still scarce and remains largely unknown. Our review briefly summarizes the latest knowledge regarding the possible role of chloroplast in plant virus replication, emphasizing chloroplast-related proteins. We have highlighted current advances regarding chloroplast-related proteins' role in replicating plant (+)ss RNA viruses.

Keywords

Acknowledgement

This research was supported by grants from the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, and Forestry (120080-05-1-HD030), funded by the Ministry of Agriculture, Food and Rural Affairs, Republic of Korea. JB was supported by a research fellowship from the Brain Korea 21 Four Program.

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