Sequence analysis in the E1 region of adenovirus type 4 DNA - PubMed (original) (raw)
Comparative Study
Sequence analysis in the E1 region of adenovirus type 4 DNA
O Tokunaga et al. Virology. 1986 Dec.
Abstract
Adenovirus type 4 (Ad4) is the sole member of adenovirus group E based on overall DNA sequence homology, restriction endonuclease cleavage patterns, and the size of capsid proteins. We cloned the BamHI-F fragment from the left end of Ad4 in pUC13-1 between the SalI and BamHI sites in order to carry out the structural analysis of the E1A region of Ad4. The complete sequence of the BamHI-F fragment (2042 bp) has been determined. From the DNA sequence, the splice sites for the putative 12 S and 13 S mRNAs, encoded by the E1A region of Ad4 were deduced. If protein synthesis initiates at the first available AUG triplet (position 575), these 12 S and 13 S mRNAs would code for polypeptides containing 226 and 257 amino acids, respectively. Comparison of Ad4- and Ad7-13 S mRNA-coded polypeptides indicates that there is 57% homology, whereas the homology is only 38% with Ad12 and 31% with Ad2-13 S mRNA-coded polypeptides. The structural analysis in the E1 region of Ad4 also includes the coding region for the E1B 19-kDa protein. Ad4 and Ad7 shows 65% homology in the coding regions for E1B 19-kDa protein. Comparison of the DNA sequence of Ad4 with those of Ad2, Ad7, and Ad12 by using a dot matrix computer program and by Southern hybridization revealed that Ad4 bears a stronger homology with Ad7 than with Ad2 and Ad12 in this region. Hydropathy plots and alignments of the putative polypeptides coded by this region in Ad4 with those from the corresponding regions of different serotypes to reveal the highly conserved domains also support the above conclusion.
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