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Chemical cross-linking of the proteins of Semliki Forest virus has been performed in virus particles and in baby hamster kidney-21 (BHK-21) cells infected with Semliki Forest virus. Most of the studies were done with the reversible cross-linkers dimethyl 3,3'-thiobis(propionimidate) and dithiobis(succinimidyl propionate). The identity of the cross-linked species was determined by two-dimensional electrophoresis. The results with virus particles showed extensive cross-linking of the nucleocapsid proteins and the formation of dimers of the two large envelope glycoproteins (E1 and E2). Similar patterns for the cross-linked virus proteins were observed in plasma membranes isolated from BHK-21 cells infected with Semliki Forest virus. No cross-linking of the third envelope glycoprotein (E3) was observed. Also, there was no evidence for significant cross-linking between host and virus proteins. The addition of colchicine, a drug that disrupts microtubules, to infected BHK-21 cells had no effect on the cross-linking of virus proteins in the plasma membrane. In contrast, dibucaine, a local anesthetic, greatly inhibited the formation of envelope dimers (E1-E2) in plasma membranes, but not in virus particles. The implication of these results for the involvement of the cytoskeletal system in the morphogenesis of Semliki Forest virus is discussed.

journal of virology

Chemical cross-linking of proteins of Semliki Forest virus: virus particles and plasma membranes from BHK-21 cells treated with colchicine or dibucaine