1887

Abstract

The replication of ringspot virus (CymRSV) defective interfering (DI) RNA in cells of the yeast normally takes place in association with the peroxisomal membrane, thus paralleling the replication events in infected plant cells. However, previous results with a peroxisome-deficient mutant strain of yeast had suggested that the presence of peroxisomes is not a strict requirement for CymRSV DI RNA replication. Thus, a novel approach was used to study the putative alternative sites of replication by using strain YPH499 which does not contain normal peroxisomes. In this strain, CymRSV p33 and p92 accumulated over portions of the nuclear membrane and on membranous overgrowths which were identified as endoplasmic reticulum (ER) strands, following immunofluorescence and immunoelectron microscope observations. The proteins were not released by high-pH treatment, but were susceptible to proteolytic digestion, thus indicating peripheral and not integrated association. ER-associated p33 and p92 proteins supported the replication of DI RNA. The capacity of plus-strand RNA viruses to replicate in association with different types of cell membranes was thus confirmed.

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2007-05-01
2024-03-29
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