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. 1986 Mar;57(3):1084–1093. doi: 10.1128/jvi.57.3.1084-1093.1986

Molecular cloning and sequence determination of the genomic regions encoding protease and genome-linked protein of three picornaviruses.

G Werner, B Rosenwirth, E Bauer, J M Seifert, F J Werner, J Besemer
PMCID: PMC252842  PMID: 3512851

Abstract

To investigate the degree of similarity between picornavirus proteases, we cloned the genomic cDNAs of an enterovirus, echovirus 9 (strain Barty), and two rhinoviruses, serotypes 1A and 14LP, and determined the nucleotide sequence of the region which, by analogy to poliovirus, encodes the protease. The nucleotide sequence of the region encoding the genome-linked protein VPg, immediately adjacent to the protease, was also determined. Comparison of nucleotide and deduced amino acid sequences with other available picornavirus sequences showed remarkable homology in proteases and among VPgs. Three highly conserved peptide regions were identified in the protease; one of these is specific for human picornaviruses and has no obvious counterpart in encephalomyocarditis virus, foot-and-mouth disease virus, or cowpea mosaic virus proteases. Within the other two peptide regions two conserved amino acids, Cys 147 and His 161, could be the reactive residues of the active site. We used a statistical method to predict certain features of the secondary structures, such as alpha helices, beta sheets, and turns, and found many of these conformations to be conserved. The hydropathy profiles of the compared proteases were also strikingly similar. Thus, the proteases of human picornaviruses very probably have a similar three-dimensional structure.

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Selected References

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