Table of Contents
Does E2F bind DNA?
Typical E2Fs bind to DNA as heterodimers with the related dimerization partner (DP) proteins, whereas the atypical E2Fs, E2F7 and E2F8 contain two DNA-binding domains (DBDs) and act as repressors.
What is E2F in cell cycle?
E2F is a group of genes that encodes a family of transcription factors (TF) in higher eukaryotes. Three of them are activators: E2F1, 2 and E2F3a. Six others act as suppressors: E2F3b, E2F4-8. All of them are involved in the cell cycle regulation and synthesis of DNA in mammalian cells.
What does E2F transcription?
The E2 factor (E2F) family of transcription factors are downstream effectors of the retinoblastoma (RB) protein pathway and are believed to play a pivotal role in cell division control. Since its discovery, E2F has been viewed as a positive regulator of genes required for DNA synthesis.
What is E2F protein?
E2F1 Gene – E2F Transcription Factor 1 The protein encoded by this gene is a member of the E2F family of transcription factors. The E2F family plays a crucial role in the control of cell cycle and action of tumor suppressor proteins and is also a target of the transforming proteins of small DNA tumor viruses.
What is the role of E2F?
Role of E2F targets in DNA replication. E2F plays central roles in DNA replication by activating genes coding for factors involved in initiation of DNA replication, DNA synthesis, DNA damage checkpoint, and DNA repair.
What is Rb E2F?
The RB/E2F pathway regulates apoptosis, and RB inhibition of apoptosis is an important mechanism of tumor suppression whereby cells deficient for RB function can be eliminated by apoptosis. One manner through which RB can inhibit apoptosis is through its binding to RNA processing factors.
How does Rb bind E2F?
The Rb proteins repress gene transcription, required for transition from G1 to S phase, by directly binding to the transactivation domain of E2F and by binding to the promoter of these genes as a complex with E2F (Adams et al., 1995).
Where does Rb bind E2F?
promoter
The Rb proteins repress gene transcription, required for transition from G1 to S phase, by directly binding to the transactivation domain of E2F and by binding to the promoter of these genes as a complex with E2F (Adams et al., 1995).
Does Rb inhibit E2F?
A number of studies have shown that transcriptional activation by E2F is important for the progression of cells through the cell cycle (Johnson et al. 1993), suggesting that Rb arrests cells in G1by inhibiting E2F transcriptional activity (Zhu et al. 1993; Qin et al. 1995).
What does E2F do to Rb?
How E2F and retinoblastoma function together in the regulation of the cell cycle?
The retinoblastoma protein (RB1) is a critical tumor suppressor gene that blocks cell cycle progression by inhibiting E2F transcription factors when unphosphorylated. On phosphorylation by cyclin-dependent kinases, RB1 is targeted for degradation and the E2F transcription factors are allowed to be active.
Does Rb activate E2F?
Rb can repress transcription by at least two different mechanisms. First, it can bind transcription factors such as E2F and block their ability to activate transcription (Flemington et al.
Can E2Fs bind to isolated regions that lack consensus motifs?
Our findings suggest that in vivo (1) a consensus motif is not sufficient to recruit E2Fs, (2) E2Fs can bind to isolated regions that lack a consensus motif, and (3) binding can require regions other than the best match to the E2F motif. 3T3 Cells Animals Binding Sites / genetics
What is the function of E2F PRB?
E2F/pRb complexes. pRb is one of the targets of the oncogenic human papilloma virus protein E7, and human adenovirus protein E1A. By binding to pRB, they stop the regulation of E2F transcription factors and drive the cell cycle to enable virus genome replication.
What is the function of E2F1?
E2F is a group of genes that encodes a family of transcription factors (TF) in higher eukaryotes. Three of them are activators: E2F1, 2 and E2F3a. Six others act as suppressors: E2F3b, E2F4-8.
Is a consensus motif sufficient to recruit E2Fs in vivo?
Our findings suggest that in vivo (1) a consensus motif is not sufficient to recruit E2Fs, (2) E2Fs can bind to isolated regions that lack a consensus motif, and (3) binding can require regions other than the best match to the E2F motif. 3T3 Cells Animals Binding Sites / genetics Chromatin Immunoprecipitation / methods Consensus Sequence