Molecular analysis of structural protein genes of the yamagata-1 strain of defective subacute sclerosing panencephalitis virus. II. Nucleotide sequence of a cDNA corresponding to the P plus M dicistronic mRNA |
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Authors: | Yasuhiro Yoshikawa Hiroshi Tsuruoka Mineo Matsumoto Takeshi Haga Tatsuo Shioda Hiroshi Shibuta Takeshi A. Sato Kazuya Yamanouchi |
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Affiliation: | (1) Laboratory Animal Research Center, Institute of Medical Science, University of Tokyo, Tokyo, Japan;(2) Department of Virus Infection, Institute of Medical Science, University of Tokyo, Tokyo, Japan;(3) Department of Measles Virus, National Institute of Health of Japan, Tokyo, Japan |
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Abstract: | The nucleotide sequence of a cloned cDNA corresponding to the P+M dicistronic mRNA of a subacute sclerosing panencephalitis (SSPE) virus was determined and compared with data of measles virus (MV). The dicistronic mRNA of the SSPE virus consisted of the 3 proximal 626 nucleotides of P mRNA, intercistronic trinucleotides, a full length of M mRNA, and 75 poly A nucleotides. The part encoding the P protein had a high homology to MV, except at the noncoding region. The terminating consensus sequence of the P gene and the intercistronic trinucleotides of the SSPE virus were CTAC(A)6 and CCT; in MV they are TTAT(A)6 and CTT, respectively. In the M gene, the starting consensus sequence was exactly the same as MV, but at the 5 proximal end, one third of this gene was different: The first ATG codon of the MV M gene signaling opening of the reading frame was changed to ACG in the SSPE virus and one long open reading frame started from the third ATG codon. The stop codon (TAG) of the MV M gene was also changed to CAG in the SSPE virus. Thus, the deduced SSPE-virus M protein lacked 50 amino acids at the amino terminal and had 15 extra amino acids at the carboxyl end when compared with the MV M protein. |
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Keywords: | SSPE virus measles virus phosphoprotein gene matrix protein gene dicistronic mRNA mutation |
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