Bovine viral diarrhea virus: affinity chromatography on Crotalaria juncea lectin

Image analysis techniques for automatic evaluation of two-dimensional electrophoresis

Techniques for automatic analysis of two-dimensional electrophoresis gels by computer-aided image analysis are described. Original gels or photographic films are scanned using a laser scanner and the files are transferred to a microcomputer. The program package first performs a compression and preevaluation of the files. Spot identification and quantification is performed by the chain code algorithm after appropriate zooming and cutting. Labeling facilitates spot identification and quantification in numerical and graphical (pseudocolor) representation on peripheral devices for camera ready output. Interpolation between measured basepoints is performed by cubic spline algorithms which are automatically switched on and off, depending on the need by the program. High speed analysis and graphic representation is achieved using fast Assembler language routines rather than high level languages. One-dimensional gels can be analyzed using the same software. Spot matching between parallel two-dimensional gels has not yet been implemented.

Characterization of the major structural proteins of purified bovine viral diarrhea virus

Bovine viral diarrhea virus (BVDV) was concentrated and purified by a combination of ultrafiltration, hydroextraction using polyethylene glycol and affinity chromatography. A lectin from Crotalaria juncea that has an affinity for galactose was used in the affinity chromatography. Virions of BVDV with classic envelopes were observed by electron microscopy. Four major proteins with estimated molecular weights of 75,000, 66,000, 54,000, and 26,000 were identified in sodium dodecyl sulfate--polyacrylamide gel electrophoresis slab gels. The proteins of 75,000 and 54,000 were glycoproteins as shown by staining with dansyl hydrazine.

Bovine viral diarrhea virus: purification of surface proteins in detergent-containing buffers by fast protein liquid chromatography

Bovine viral diarrhea virus was purified by lectin chromatography. The glycoprotein peplomers were dissociated from the virion by treatment with detergent. By a second lectin gel chromatography the glycoconjugates containing terminal galactose were prepared. In combination with lectin affinity chromatography, ion-exchange chromatography on Mono-Q in the presence of the low-UV-absorbing detergent Berol 172 proved to be a powerful technique both for analytical and preparative applications.