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Enzymatic markers and electron microscopy were utilized to determine the cellular origin of the membrane types isolated from type 2 dengue virus-infected BHK cells by discontinuous sucrose gradient centrifugation. The results showed an apparent separation of plasma membrane, smooth and rough endoplasmic reticulum with increasing density. Virus-induced protein and RNA synthesis, as indicated by the incorporation of radiolabled precursors, was localized on the rough endoplasmic reticulum. Glycosylation, measured by the incorporation of radiolabeled glucosamine into membrane-associated proteins, was most active in the bands of intermediate and smooth endoplasmic reticulum. Polyacrylamide gel electrophoresis of isolated membrane bands, radiolabeled in the presence of actinomycin D, after pulse inhibition by cycloheximide, revealed seven virus-specific proteins associated with all membrane fractions. Viral structural protein V-3, and nonstructural proteins NV-3 and NV-2, increased with decreasing density, whereas NV-5 and NV-4 remained constant. The viral capsid protein V-2 was depleted in the intermediate and smooth endoplasmic reticulum, suggesting that these membranes may serve as the sites for viral maturation. NV-3 was the most prominent virus-specified protein found in the plasma membrane.

Dengue virus-induced modifications of host cell membranes