PMID: 11330699May 2, 2001Paper

Primary structure and phylogenetic analysis of the coat protein of a Toyama isolate of tobacco necrosis virus

Bioscience, Biotechnology, and Biochemistry
K SaekiK Fukuyama

Abstract

The amino acid sequence of the coat protein (CP) of a tobacco necrosis virus (TNV) strain, Toyama isolate, was determined by a combination of peptide and cDNA sequencing. The deduced sequence of 276 residues was compared with CPs of other TNV isolates and other plant virus isolates of Tombusviridae. It showed the highest similarity to the TNV Nebraska isolate with 92% identity and moderate similarity to the TNV strain A with 51% identity, confirming the previous serological analysis. It also showed overall similarity with CPs of mostly genera Necrovirus and Sobemovirus, and partial similarity with CPs of genera Tombusvirus and Carmovirus. Among 13 CPs that showed overall similarity, there were 10 completely conserved residues. These included three residues that participate in Ca2+ ligation at the interfaces of virion subunits in TNV crystal structure, suggesting that similar metal binding occur in the viruses of genera Necrovirus and Sobemovirus.

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