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1.  Leader Proteinase of the Beet Yellows Closterovirus: Mutation Analysis of the Function in Genome Amplification 
Journal of Virology  2000;74(20):9766-9770.
The beet yellows closterovirus leader proteinase (L-Pro) possesses a C-terminal proteinase domain and a nonproteolytic N-terminal domain. It was found that although L-Pro is not essential for basal-level replication, deletion of its N-terminal domain resulted in a 1,000-fold reduction in RNA accumulation. Mutagenic analysis of the N-terminal domain revealed its structural flexibility except for the 54-codon-long, 5′-terminal element in the corresponding open reading frame that is critical for efficient RNA amplification at both RNA and protein levels.
PMCID: PMC112412  PMID: 11000252

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