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DNA-binding Proteins of Chick Embryo Lethal Orphan Virus: Lack of Complementation between Early Proteins of Avian and Human Adenoviruses

Peng Li

Department of Microbiology, John Curtin School of Medical Research, Australian National University, G.P.O. Box 334, Canberra, A.C.T. 2601, Australia

Chick cells infected by chick embryo lethal orphan (CELO) virus (fowl adenovirus type 1) contained four prominent virus-specific, structurally related DNA-binding proteins with mol. wt. of 74K, 64K, 56K, 52K, and two minor forms. The CELO virus DNA-binding proteins were phosphorylated, delayed-early nuclear proteins. CELO virus early proteins were expressed in BHK cells, but did not complement human adenovirus type 5 mutants with lesions in E1A, E2A or E2B. Moreover, CELO virus DNA-binding proteins were not produced in 293 cells, which express human adenovirus E1 genes. These results suggest that activation of transcription by adenovirus E1A genes involves specific interactions between the E1A gene products and viral early promoters.

Keywords: adenovirus, avian, DNA-binding proteins, E1A complementation

Present address: Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.

Received 27 March 1984; accepted 19 June 1984.