Structure characteristics of ORF2a gene of potato leafroll virus Chinese isolate / 生物工程学报
Chinese Journal of Biotechnology
;
(12): 744-748, 2002.
Article
in Chinese
| WPRIM
| ID: wpr-256127
ABSTRACT
According to the genomic sequence of foreign four PLRV isolates, three pairs of specific primer were designed and synthesized. The cDNA of the ORF2a gene of PLRV-Ch was synthesized by reverse transcription and followed by Polymerase Chain Reaction amplication. The synthesized 3' and 5' cDNA fragment of the PLRV-Ch ORF2a gene were inserted into pUC19 and cloned in E. coli JM109 and were sequenced respectively. The middle cDNA fragment were directly sequenced. The homology of nucleotide sequence of PLRV-Ch compared with PLRV-S (Scotland, UK), PLRV-N(Netherlands), PLRV-A(Australia) and PLRV-C(Canada) were 98.96%, 98.70%, 94.79%, 97.5%, the homology of putative amino acid sequence are 97.97%, 97.97%, 89.69%, 95.94%. In 3' region of ORF2a gene a slippery sequence for-1 frameshift and its downstream "stem-loop" or "pseudoknot" and upstream nucleotide sequence repeats were found. Authors suggested that the nucleotide repeat sequences characteristic for PLRV could form a tight successively folded complementary double stranded regions and hairpins. This structure possibly has something to do with-1 frameshift. The amino acid sequence of C terminus region of 70 kD protein translated by motif IV has a protease characteristic motif and a helicase motif IV. The amino acid sequence of polypeptide translated by ORF2a gene undergoing frameshift has a single-stranded nucleic acid binding protein-like characteristic motif.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Viral Proteins
/
Virology
/
Solanum tuberosum
/
Chemistry
/
Open Reading Frames
/
Protein Folding
/
Luteovirus
/
Reverse Transcriptase Polymerase Chain Reaction
/
Amino Acid Motifs
/
Genetics
Language:
Chinese
Journal:
Chinese Journal of Biotechnology
Year:
2002
Type:
Article
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