We have recently shown by immunoprecipitation, peptide mapping, and in vitro translation that E1, the transforming gene region of the human adenovirus 2 (Ad2) genome, encodes two or more """"""""families"""""""" of partially related polypeptides. One family, coded by Ela (mp 1.5-4.5) includes four 40K-50K polypeptides that are partially related; a second family coded by Elb (mp 4.5-ll), includes major 53K and 15K polypeptides that are highly related. Minor polypeptides of 14K-16K and 18K-20K were detected that are part of the 53K/15K family. Polypeptides of 28K and 11K-12K were also immunoprecipitated that are unrelated by peptide mapping to each other or to Ela-40K-50K or to Elb-53K/15K. In this proposal, we will (1) investigate whether the 28K and 11K-12K are E1-coded, by peptide mapping of polypeptides translated in vitro, (2) determine whether the E1-coded polypeptides are synthesized in 6 lines (F17, T2C4, 8617, F4, FRK, 293) of Ad-transformed cells, using radioimmunoprecipitation, O'Farrell 2D gels, and peptide mapping, (3) investigate the polypeptides specified by transformation-defective host range mutants with deletions in E1, in order to identify and map E1-coded polypeptides, and to relate specific polypeptides to the phenotypes of these mutants, (4) purify the Elb-53K and 15K polypeptides to homogeneity, attempt to purify Ela-40K-50Ks, and perhaps the minor E1-polypeptides prepare monospecific antisera, and attempt experiments to illuminate the functions of these polypeptides, (5) sequence the N-termini of the Elb-53K, Elb-15K, Ela-40-K-50Ks, and partially sequence the N-termini of cyanogen bromide fragments in order to align the structural genes for these polypeptides with the viral DNA sequence. We will also do limited analyses of E1-coded polypeptides of group A (Ad12) and group B (Ad12) and group B (Ad7) Ads, for comparative purposes with group C (Ad2, 5) Ads. Our studies may contribute to our understanding of the functions of the E1-coded polypeptides in cell transformation and virus replication, and to the organization and regulation of overlapping split genes.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA021824-09
Application #
3165647
Study Section
Virology Study Section (VR)
Project Start
1977-09-01
Project End
1987-08-31
Budget Start
1985-09-01
Budget End
1986-08-31
Support Year
9
Fiscal Year
1985
Total Cost
Indirect Cost
Name
Saint Louis University
Department
Type
Schools of Medicine
DUNS #
City
Saint Louis
State
MO
Country
United States
Zip Code
63103
Lillie, J W; Loewenstein, P M; Green, M R et al. (1987) Functional domains of adenovirus type 5 E1a proteins. Cell 50:1091-100
Symington, J S; Lucher, L A; Brackmann, K H et al. (1986) Biosynthesis of adenovirus type 2 i-leader protein. J Virol 57:848-56
Lucher, L A; Brackmann, K H; Symington, J S et al. (1986) Posttranslational modification at the N terminus of the human adenovirus type 12 E1A 235R tumor antigen. J Virol 58:592-9
Lillie, J W; Green, M; Green, M R (1986) An adenovirus E1a protein region required for transformation and transcriptional repression. Cell 46:1043-51
Lucher, L A; Symington, J S; Green, M (1986) Biosynthesis and properties of the adenovirus 2 L1-encoded 52,000- and 55,000-Mr proteins. J Virol 57:839-47
Lucher, L A; Loewenstein, P M; Green, M (1985) Phosphorylation in vitro of Escherichia coli-produced 235R and 266R tumor antigens encoded by human adenovirus type 12 early transformation region 1A. J Virol 56:183-93