Abstract
Avian infectious bronchitis virus (IBV) causes economically important disease in chickens, affecting both respiratory and non-respiratory tissues. Like other coronaviruses IBV virions contain three virus-coded protein structures, the spike (S; surface projection, peplomer), nucleocapsid (N) and matrix (M) proteins1. The polypeptides of M and N proteins have been identified. The M protein comprises a polypeptide of mol. wt. 23 000 (23K) which is glycosylated to different extents, the major glycopolypeptide being about 30K2,3,4. A polypeptide of about 50K forms the N protein5. However, although many papers have been published on the composition of IBV, there has been a distinct lack of agreement on the number and mol. wt. of the polypeptides which form the spikes (for references see1,6.KeywordsSucrose GradientDisulphide BondInfectious Bronchitis VirusSemliki Forest VirusHigh MannoseThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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