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[Various physical and chemical properties of the 73s unit of the foot-and-mouth disease virus]. 1976

H T Liebermann, and J Meissner, and P Schulze, and G Thalmann

At all 3 studied FMD-viruses typs O2, A5 and C we could show the 73S unit in the analytical ultracentrifuge and in the electron microscope. 73S unit is found in the normal cycle of purification of virus and by density gradient centrifugation separated and purified. In CsCl pH 7.6 its density is 1.308 +/- 0,005 g/ml. Its sedimentation coefficient has a value of 72.7 +/- 1,5S. In electron microscope it show itself as a empty virus capsid. Its diameter is in partial purified preparations with 25 +/- 1 nm the same as of the virion. Its wall diameter is 2 to 3 nm. Further purification induced defiguration of particles and increase of its diameter. 73S unit dissociates in 19S and 12S units and shows a typical protein-UV-absorption spectrum with a maximum at 276 to 278 nm and a minimum at 250 nm. Emax/Emin is 2.3. Extinction coefficient E276nm is 1,4 mg/cm2. By sucrose density gradient centrifugation and titration of fractions in the complement fixation test it was detected, that croude virus solution contained already the 73S unit.

UI MeSH Term Description Entries
D002213 Capsid The outer protein protective shell of a virus, which protects the viral nucleic acid. Capsids are composed of repeating units (capsomers or capsomeres) of CAPSID PROTEINS which when assembled together form either an icosahedral or helical shape. Procapsid,Prohead,Capsids,Procapsids,Proheads
D005537 Aphthovirus A genus of the family PICORNAVIRIDAE infecting mainly cloven-hoofed animals. They cause vesicular lesions and upper respiratory tract infections. FOOT AND MOUTH DISEASE VIRUS is the type species. Equine rhinitis A virus,Equine rhinovirus 1,Aphthoviruses
D000956 Antigens, Viral Substances elaborated by viruses that have antigenic activity. Viral Antigen,Viral Antigens,Antigen, Viral
D014461 Ultracentrifugation Centrifugation with a centrifuge that develops centrifugal fields of more than 100,000 times gravity. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
D046508 Culture Techniques Methods of maintaining or growing biological materials in controlled laboratory conditions. These include the cultures of CELLS; TISSUES; organs; or embryo in vitro. Both animal and plant tissues may be cultured by a variety of methods. Cultures may derive from normal or abnormal tissues, and consist of a single cell type or mixed cell types. Culture Technique,Technique, Culture,Techniques, Culture

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