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  • Title: A single amino acid in the helicase domain of PMMoV-S is responsible for its enhanced accumulation in C. chinense (L(3)L(3)) plants at 32°C.
    Author: Tena F, Molina-Galdeano M, Serra MT, García-Luque I.
    Journal: Virology; 2012 May 25; 427(1):34-43. PubMed ID: 22377122.
    Abstract:
    In Capsicum chinense (L(3)L(3)) plants a higher accumulation of the tobamovirus Pepper mild mottle virus strain S (PMMoV-S) as compared to the Italian strain PMMoV-I is detected when plants are grown at 32°C. By using a reverse genetic approach, we have established that a single amino acid at position 898 in the helicase domain of the polymerase protein, outside of the conserved regions of the helicase, is critical for the higher accumulation of PMMoV-S observed. It also is necessary for both increased accumulation of viral RNA of both polarities in pepper protoplasts and enhanced cell-to-cell movement in C. chinense plants. The influence of thermoresistance of PMMoV-S, a P(1,2) pathotype, and its prevalence on pepper cultivars over PMMoV-I, a P(1,2,3), pathotype, is discussed.
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