Association between an oncogene and an anti-oncogene: the adenovirus E1A proteins bind to the retinoblastoma gene product

Nature ◽  
1988 ◽  
Vol 334 (6178) ◽  
pp. 124-129 ◽  
Author(s):  
Peter Whyte ◽  
Karen J. Buchkovich ◽  
Jonathan M. Horowitz ◽  
Stephen H. Friend ◽  
Margaret Raybuck ◽  
...  
Keyword(s):  
Gene Product ◽  
Retinoblastoma Gene ◽  
Adenovirus E1a ◽  
Retinoblastoma Gene Product

scholarly journals Protein domains governing interactions between E2F, the retinoblastoma gene product, and human papillomavirus type 16 E7 protein.

1993 ◽  
Vol 13 (2) ◽  
pp. 953-960 ◽  
Author(s):  
P S Huang ◽  
D R Patrick ◽  
G Edwards ◽  
P J Goodhart ◽  
H E Huber ◽  
...  
Keyword(s):  
Amino Acids ◽  
Complex Formation ◽  
Gene Product ◽  
Mammalian Cells ◽  
Protein Product ◽  
Human Papillomaviruses ◽  
Retinoblastoma Gene ◽  
Adenovirus E1a ◽  
Cellular Transcription Factor ◽  
Retinoblastoma Gene Product

Human papillomaviruses (HPVs) are the etiological agents for genital warts and contribute to the development of cervical cancer in humans. The HPV E7 gene product is expressed in these diseases, and the E7 genes from HPV types 16 and 18 contribute to transformation in mammalian cells. Mutation and deletion analysis of this gene suggests that the transforming activity of the protein product resides in the same domain as that which is directly involved in complex formation with the retinoblastoma gene product (pRB). This domain is one of two conserved regions (designated CRI and CRII) shared by E7 and other viral oncoproteins which bind pRB, including adenovirus E1A protein. Binding of HPV type 16 E7 protein to pRB has previously been shown to affect pRB's ability to bind DNA and to form complexes with other cellular proteins. In the current study, we map the functional interaction between E7 protein and pRB by monitoring the association between a 60-kDa version of the pRB, pRB60, and the cellular transcription factor E2F. We observe that CRII of E7 (amino acids 20 to 29), which completely blocks binding of full-length E7 protein, is necessary but not sufficient to inhibit E2F/pRB60 complex formation. While CRI of E1A (amino acids 37 to 55) appears to be sufficient to compete with E2F for binding to pRB60, the equivalent region of E7 is neither necessary nor sufficient. Only E7 fragments that contained both CRII and at least a portion of the zinc-binding domain (amino acids 60 to 98) inhibited E2F/pRB60 complex formation. These results suggest that pRB60 associates with E7 and E2F through overlapping but distinct domains.

Protein domains governing interactions between E2F, the retinoblastoma gene product, and human papillomavirus type 16 E7 protein

1993 ◽  
Vol 13 (2) ◽  
pp. 953-960
Author(s):  
P S Huang ◽  
D R Patrick ◽  
G Edwards ◽  
P J Goodhart ◽  
H E Huber ◽  
...  
Keyword(s):  
Amino Acids ◽  
Complex Formation ◽  
Gene Product ◽  
Mammalian Cells ◽  
Protein Product ◽  
Human Papillomaviruses ◽  
Retinoblastoma Gene ◽  
Adenovirus E1a ◽  
Cellular Transcription Factor ◽  
Retinoblastoma Gene Product

Human papillomaviruses (HPVs) are the etiological agents for genital warts and contribute to the development of cervical cancer in humans. The HPV E7 gene product is expressed in these diseases, and the E7 genes from HPV types 16 and 18 contribute to transformation in mammalian cells. Mutation and deletion analysis of this gene suggests that the transforming activity of the protein product resides in the same domain as that which is directly involved in complex formation with the retinoblastoma gene product (pRB). This domain is one of two conserved regions (designated CRI and CRII) shared by E7 and other viral oncoproteins which bind pRB, including adenovirus E1A protein. Binding of HPV type 16 E7 protein to pRB has previously been shown to affect pRB's ability to bind DNA and to form complexes with other cellular proteins. In the current study, we map the functional interaction between E7 protein and pRB by monitoring the association between a 60-kDa version of the pRB, pRB60, and the cellular transcription factor E2F. We observe that CRII of E7 (amino acids 20 to 29), which completely blocks binding of full-length E7 protein, is necessary but not sufficient to inhibit E2F/pRB60 complex formation. While CRI of E1A (amino acids 37 to 55) appears to be sufficient to compete with E2F for binding to pRB60, the equivalent region of E7 is neither necessary nor sufficient. Only E7 fragments that contained both CRII and at least a portion of the zinc-binding domain (amino acids 60 to 98) inhibited E2F/pRB60 complex formation. These results suggest that pRB60 associates with E7 and E2F through overlapping but distinct domains.

Retinoblastoma gene product activates expression of the human TGF-β2 gene through transcription factor ATF-2

Nature ◽  
1992 ◽  
Vol 358 (6384) ◽  
pp. 331-334 ◽  
Author(s):  
Seong-Jin Kim ◽  
Susanne Wagner ◽  
Fang Liu ◽  
Michael A. O'Reilly ◽  
Paul D. Robbins ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Gene Product ◽  
Retinoblastoma Gene ◽  
Retinoblastoma Gene Product

scholarly journals Control of Cell Cycle Progression in Human Natural Killer Cells Through Redox Regulation of Expression and Phosphorylation of Retinoblastoma Gene Product Protein

Blood ◽  
1997 ◽  
Vol 89 (11) ◽  
pp. 4092-4099 ◽  
Author(s):  
Akira Yamauchi ◽  
Eda T. Bloom
Keyword(s):  
Cell Cycle ◽  
Nk Cells ◽  
Natural Killer ◽  
Gene Product ◽  
Redox Regulation ◽  
Interleukin 2 ◽  
Retinoblastoma Gene ◽  
Regulation Of Expression ◽  
Retinoblastoma Gene Product

Abstract Using thiol deprivation, we have previously shown that the response of natural killer (NK) cells to interleukin-2 (IL-2) is subject to redox regulation downstream of IL-2 binding and internalization. We have now used the IL-2–dependent cell line, NK3.3 to study redox regulation of NK cells further, and found that NK3.3 cells neither incorporated [3H]-thymidine nor completed the G1-S phase transition in medium lacking the thiol-related compounds, L-cystine, and glutathione, despite the presence of sufficient IL-2. Thiol deprivation did not alter the induction of DNA interferon-γ activated sequence (GAS)-binding activity in response to IL-2. However, the retinoblastoma gene product (RB), a cyclin-dependent kinase (CDK) substrate, was phosphorylated within 24 hours after IL-2 stimulation in standard medium, but its expression and phosphorylation were reduced in thiol-depleted medium in both NK3.3 cells and freshly isolated NK cells. These reductions were not associated with an increased level of p27Kip1, an inhibitor of CDKs CDK6/2 in association with G1 cyclins. Reducing agents, N-acetylcysteine, reduced glutathione or 2-ME restored both RB phosphorylation and DNA synthesis in thiol-deprived NK3.3 cells. The in vitro kinase activities of CDK6 and CDK2 were prematurely increased by thiol deprivation. This enhancement was associated with CDK hyperphosphorylation and prolonged phosphorylation, and could be observed before and beyond IL-2 stimulation. The data suggest the possibility that the premature and prolonged enhancement of CDK activity in thiol-deprived NK cells is associated with, and therefore may contribute to, the reduced expression and phosphorylation of RB, and the associated cell cycle arrest.

Expression of retinoblastoma gene product and p21 (WAF1/Cip 1) protein in gliomas: correlations with proliferation markers, p53 expression and survival

1998 ◽  
Vol 95 (6) ◽  
pp. 617-624 ◽  
Author(s):  
Penelope Korkolopoulou ◽  
Konstantinos Kouzelis ◽  
Panayota Christodoulou ◽  
Athanassios Papanikolaou ◽  
Euphemia Thomas-Tsagli
Keyword(s):  
Gene Product ◽  
Retinoblastoma Gene ◽  
Proliferation Markers ◽  
P53 Expression ◽  
Retinoblastoma Gene Product ◽  
P21 Waf1
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