Authors: Guohui Li Zhaoyang Hu Xuli Guo Guangtian Li Qi Tang Peng Wang Keping Chen Qin Yao
Publish Date: 2013/01/18
Volume: 66, Issue: 6, Pages: 527-534
Abstract
Bombyx mori bidensovirus BmBDV VD1ORF4 open reading frame 4 ORF4 consists of 3318 nucleotides which codes for a predicted 1105amino acid protein containing a conserved DNA polymerase motif However its functions in viral propagation remain unknown In the current study the transcription of VD1ORF4 was examined from 6 to 96 h postinfection pi by RTPCR 5′RACE revealed the transcription initiation site of BmBDV ORF4 to be −16 nucleotides upstream from the start codon and 3′RACE revealed the transcription termination site of VD1ORF4 to be +7 nucleotides downstream from termination codon Three different proteins were examined in the extracts of BmBDVinfected silkworms midguts by Western blot using raised antibodies against VD1ORF4 deduced amino acid and a specific protein band about 53 kDa was further detected in purified virions using the same antibodies Taken together BmBDV VD1ORF4 codes for three or more proteins during the viral life cycle one of which is a 53 kDa protein and confirmed to be a component of BmBDV virionThis work was supported by the National Natural Science Foundation of China 31000080 31270192 and 31272507 China Postdoctoral Science Foundation funded project No 2011M500855 National basic Research Program of China under Grant No 2012CB114604 and starting fund projects for senior professionals 09JDG057
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