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Published on: November 1, 2011
Rice dwarf phytoreovirus segment S12 transcript is tricistronic in vitro
N Suzuki1, M Sugawara, T Kusano
1Laboratory of Plant Genetic Engineering, Akita Prefectural College of Agriculture, Japan.
Virology
|December 1, 1992
Summary
Rice dwarf phytoreovirus segment S12 contains two open reading frames (ORFs). The small ORF is conserved across related viruses, suggesting an important function, and produces small polypeptides in vitro.
Area of Science:
- Molecular biology
- Virology
- Genetics
Background:
- Rice dwarf phytoreovirus (RDV) is a significant plant pathogen.
- Understanding viral genome organization is crucial for disease control.
- Segment S12 of RDV has a complex coding potential.
Purpose of the Study:
- To analyze the coding capacity of rice dwarf phytoreovirus segment S12.
- To investigate the function of the small open reading frame (ORF) within segment S12.
- To determine the role of specific codons in polypeptide synthesis.
Main Methods:
- Sequence analysis of RDV segment S12.
- In vitro transcription and translation of full-length cDNA.
- Site-directed mutagenesis of ATG codons within the small ORF.
Main Results:
- Segment S12 (1066 nucleotides) possesses a major ORF and a small, overlapping ORF.
- The large ORF encodes a 33 kDa polypeptide; the small ORF potentially encodes 8 kDa and 7 kDa polypeptides.
- Mutational analysis confirmed the involvement of two ATG codons in the synthesis of the 8 kDa and 7 kDa polypeptides.
Conclusions:
- The small ORF in RDV segment S12 is conserved in related Phytoreovirus species.
- This conservation suggests a significant, potentially common, functional role for the small ORF.
- Further in vivo studies are needed to confirm the expression and function of these small polypeptides.
