DNA synthesis occurs in the S phase, or the synthesis phase, of the cell cycle. The cell duplicates its hereditary material, and two copies of the chromosome are formed. As DNA replication continues, the E type cyclins shared by the G1 and S phases, are destroyed and the levels of the mitotic cyclins rise.
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In this final phase of mitosis, new membranes are formed around two sets of chromatids and two daughter cells are formed. The chromosomes and the spindle fibers disperse, and the fiber ring around the center of the cell, composed of actin, contracts, pinching the cell into two daughter cells.
The dissolution of the nuclear membrane marks the beginning of the prometaphase. Kinetochores are created when proteins attach to the centromeres. Microtubules then attach at the kinetochores, and the chromosomes begin to move to the metaphase plate.
The actual synthesis of DNA occurs in the S phase of the cell cycle. This includes the initiation of DNA replication, when the first nucleotide of the new strand is laid down during the synthesis of the primer. The DNA replication preinitiation events begin in late M or early G1 phase.
The pRB C-terminus contains a cluster of seven candidate in vivo cdk phosphorylation sites (residues 795, 807, 811, 821, and 826) and is phosphorylated in vitro by cyclin A, cyclin E, and cyclin D-associated kinases.
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A:Cdk2:p21/p27
complexChromosomal
Arms:Ac-Cohesin:PDS5:CDCA5:WAPALphospho-(T286)
Cyclin D1Annotated Interactions