How enzymes control the cell cycle?
The enzyme production is directed by genes located on the chromosomes. A general is a segment of DNA that control the production ofrece a protein.and the protein calles cyclins control the cell cycle.the interactions ofrece these molecules,based on conditions both in the cell's environment and inside The cell, controlar the cell cycle
There are many different kinds of proteins called cyclins for just about each phase in the cell cycle. throughout the cycle, they accumulate. When they reach a certain number, they activate Kinases enzymes that help the cycle proceed to the next phase. Once the cyclins have reached a certain number, enough to activate the kinases enzymes, they vanish instantly.
NOTHING happens within a cell that is not under the STRICT control of [proteinaceous] ENZYMES. Both structural and functional, all enzymes have ON and OFF switches that are, not too surprisingly, controlled by other proteins, which are themselves, in turn, Governed by The Cell Cycle: which begins when the Cell's cell-size-of-growth-indicators say-time-to-divide.
The timings of the cell cycle are controlled by cyclins (protein complexes) and cyclin-dependent kinases / CDKs (enzymes). The cyclins activate the CDKs, which affect the cell cycle at three important checkpoints: Late in the G1 stage of the cell cycle, triggering the cell to move into the S phase. Late in the G2 stage of the cell cycle, triggering the cell to move into mitosis. The M (metaphase) checkpoint, triggering entry into anaphase.
What are Cyclins and what are their functions? ^^ haha I agree They are different proteins within the cell which begin to accumulate and then rapidly disappear as the cell cycle progresses. They bind to kinases (enzymes that transfer a phosphate group from ATP to other enzymes) and activate them, which activate some enzymes directly and signal the cell to synthesize other proteins needed to progress to the next phase in the cycle. Their function…
Loss of cell cycle control is typically an oncogenic process. For cancer to occur, the cells need to replicate beyond any normal physiological control. To answer your question, one factor that in important in controlling the cell cycle is p53. p53 is a checkpoint control in the G1 phase of the cell cycle. Defects in p53 cause a loss of cell cycle regulation and are considered an oncogenic transformation.