The adenovirus E1A domains required for induction of DNA rereplication in G2/M arrested cells coincide with those required for apoptosis.
Induction of apoptosis by adenovirus E1A in rodent cells is stimulated by wild type (wt) p53 but completely suppressed by mutated p53. The suppression is overcome by coexpression with Id proteins (Ids). The cells expressing E1A and Ids undergo apoptosis after accumulation in S phase, suggesting that S phase events are perturbed by E1A and Ids. The E1A domains required for induction of apoptosis, analysed by transfection with expression vectors for E1A, Ids and their mutants, followed by flow cytometry, reside in N-terminal (positions 17 - 38), CR1 and CR2 regions. Interaction of E1A with Ids requires the N-terminal and CR1 regions. The cyclin D1 promoter activity in S phase was reduced severely by E1A and this reduction is caused through CR1 and CR2 regions required for interaction with pRB. Analysis of DNA synthesis in G2/M arrested cells indicated that E1A is capable of inducing >4 N cells and this E1A-mediated DNA rereplication is enhanced by coexpression with Id-1H. The E1A domains required for induction of DNA rereplication coincide with those required for apoptosis.
Yageta
M
M
Department of Biological Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda 278, Japan.
Tsunoda
H
H
Yamanaka
T
T
Nakajima
T
T
Tomooka
Y
Y
Tsuchida
N
N
Oda
K
K
D017500:Adenovirus E1A Proteins / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D017209:Apoptosis / Q000235:genetics*; D002460:Cell Line; D002478:Cells, Cultured; D002531:Cerebellum / Q000378:metabolism / Q000473:pathology; D019938:Cyclin D1 / Q000235:genetics / Q000378:metabolism; D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005434:Flow Cytometry; D016195:G2 Phase / Q000235:genetics*; D051798:Inhibitor of Differentiation Protein 1; D051797:Inhibitor of Differentiation Protein 2; D051379:Mice; D008938:Mitosis / Q000235:genetics*; D009154:Mutation; D011401:Promoter Regions, Genetic; D051381:Rats; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D016159:Tumor Suppressor Protein p53 / Q000235:genetics
D017500:Adenovirus E1A Proteins; D004268:DNA-Binding Proteins; C497454:ID1 protein, rat; C497451:Id2 protein, rat; C497455:Idb1 protein, mouse; C497452:Idb2 protein, mouse; D051798:Inhibitor of Differentiation Protein 1; D051797:Inhibitor of Differentiation Protein 2; D011994:Recombinant Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; D016159:Tumor Suppressor Protein p53; D019938:Cyclin D1