Characterisation of lymphoproliferative disease virus of turkeys. Structural polypeptides of the C-type particles.

Lymphoproliferative disease virus of turkeys (LPDV), a C-type retrovirus, was shown to contain 3 major [32 kilodaltons (kd, p 32), 26 kd, 22/21 kd] and 2 minor (41 kd and 12 kd) polypeptides. Preliminary evidence suggests a glycoprotein of 76 kd (GP 76) and a major doublet polypeptide of 13.5/13 kd to be also of viral origin. Of these GP 76 was susceptible to bromelain action implying its surface location in the virion, while p 32, p 26 and p 13.5/13 were the main constituents of viral cores. p 13.5/13 bound an RNA probe, suggesting it to be the main constituent of viral ribonucleoprotein. p 22/21 was not cleaved by bromelain, and was absent in viral cores suggesting its intramembrane location between virion envelope and core. The polypeptide profile of LPDV is distinct from those of avian sarcoma-leukosis viruses and avian reticuloendotheliosis viruses.