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The G1/S regulatory network or regulon in budding yeast includes the G1 cyclins Cln1, Cln2 and Cln3, Cdc28 (Cdk1), the transcription factors SBF and MBF, and the transcriptional inhibitor Whi5. [3] Cln3 interacts with Cdk1 to initiate the sequence of events by phosphorylating a large number of targets, including SBF, MBF and Whi5.
During early G1, there are three transcriptional repressors, known as pocket proteins, that bind to E2F transcription factors. The E2F gene family is a group of transcription factors that target many genes that are important for control of the cell cycle, including cyclins , CDKs, checkpoint regulators, and DNA repair proteins.
The eukaryotic cell cycle consists of four distinct phases: G 1 phase, S phase (synthesis), G 2 phase (collectively known as interphase) and M phase (mitosis and cytokinesis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's nucleus divides, and cytokinesis, in which the cell's cytoplasm and cell membrane divides forming two daughter cells.
Three methods of preventing Cdk activity are found in G 1 phase: pRB binding to E2F family transcription factors downregulate expression of S phase cyclin genes; anaphase-promoting complex (APC) is activated, which targets and degrades S and M cyclins (but not G 1 /S cyclins); and a high concentration of Cdk inhibitors is found during G 1 phase ...
19645 Ensembl ENSG00000139687 ENSMUSG00000022105 UniProt P06400 P13405 RefSeq (mRNA) NM_000321 NM_009029 RefSeq (protein) NP_000312 NP_000312.2 NP_033055 Location (UCSC) Chr 13: 48.3 – 48.6 Mb Chr 14: 73.42 – 73.56 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse The retinoblastoma protein (protein name abbreviated Rb or pRb ; gene name abbreviated Rb, RB or RB1) is a tumor ...
Whi5 is a transcriptional regulator in the budding yeast, notably in the G1 phase. [1] It plays an important role in cell size control in G1 phase, similarly with Retinoblastoma (Rb) protein in human, although the two have no similarity in sequence [2] Whi5 is an inhibitor of SBF (SCB binding factor), which is involved in the transcription of G1-specific genes.