PURIFICATION AND POLYPEPTIDE COMPOSITION OF AVIAN INFECTIOUS-BRONCHITIS VIRUS

  • 1 January 1977
    • journal article
    • research article
    • Vol. 18  (72) , 87-98
Abstract
Purification of egg-grown infectious bronchitis virus (IBV) by sucrose density gradient centrifugation alone, or sucrose density gradient centrifugation plus pH 8.0 treatment, concanavalin A precipitation or metrizamide density gradient centrifugation failed to produce any differences in the virus polypeptide pattern following sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). SDS-PAGE of purified IBV on 7.5% acrylamide gels separated 16 polypeptides which were detectable by staining with Coomassie blue or measurement of radioactivity following electrophoresis of (3H)-leucine labeled IBV. The MW of the polypeptides were within the range 15,000-135,000. The polypeptides of egg and chick kidney (CK) cell-grown IBV were identical in size and number but quantitative differences were detected. In particular the relative proportion of the major 52,000 MW polypeptide was greatly reduced in IBV grown in CK cells. SDS-PAGE of purified IBV and staining with Schiff''s reagent to detect carbohydrate revealed 4 bands with MW of 128,000, 86,000, 67,5000 and 37,000. The 128,000 band did not correspond to any of the detected polypeptides. Use of 5% acrylamide gels for SDS-PAGE of IBV failed to resolve all the minor polypeptides and only 7 bands were detected.

This publication has 0 references indexed in Scilit: