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#M phase

2 public questions tagged with this topic.

Cell Division

Which phase of the cell cycle is the most metabolically active?

Cellular metabolism is tightly coupled to cell cycle progression, with G1 phase exhibiting maximal biosynthetic activity to support doubling of mass before DNA replication. Upon growth factor binding, PI3K-Akt-mTORC1 pathway stimulates glucose uptake through GLUT1, increases glycolytic flux and pentose phosphate pathway for nucleotide precursors, enhances mitochondrial biogenesis via PGC1-alpha and mitochondrial transcription factor TFAM, and activates ribosome biogenesis through RNA polymerase I mediated rDNA transcription and S6K phosphorylation of ribosomal protein S6. Translation initiatio

Ref: Alberts et al., Molecular Biology of the Cell, 7th ed., Chapter 17: G1 Metabolism and Growth.

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Cell Cycle Regulation

The M-phase regulator known as MPF (Maturation Promoting Factor) consists of:

Experiments in amphibian oocytes and in yeast genetics converged upon identification of universal M-phase regulator historically called Maturation Promoting Factor for its ability to induce meiotic maturation when cytoplasm from M-phase cells injected into G2 oocytes. Molecular composition resolved as complex of catalytic subunit CDK1 originally named cdc2 or p34cdc2 and regulatory subunit Cyclin B. CDK1 provides serine-threonine kinase activity requiring activating phosphorylation on activation loop Thr161 by CAK complex CDK7-Cyclin H-MAT1 and removal of inhibitory phosphates Thr14 Tyr15 via

Ref: Nurse, Universal Control of Cell Division by CDK1-Cyclin B MPF, Nature 1990; Alberts et al., Molecular Biology of the Cell, Chapter 17, Discovery of MPF.

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