Priming activity is required to provide 3'-0H ends to start off the DNA chains on both the leading and lagging strands.

TLS Online TPP Program

#Id: 2965

#Unit 3. Fundamental Processes

In yeast, Cdc6 is a highly unstable protein, with a half-life of <5 minutes. It is synthesized during G1 and typically binds to ORC between the exit from mitosis and late G1.

TLS Online TPP Program

#Id: 2966

#Unit 3. Fundamental Processes

pathway. Cdt1  is initially stabilized by the protein Geminin, which prevents its degradation, and subsequent Geminin binding prevents its reuse.

TLS Online TPP Program

#Id: 2967

#Unit 3. Fundamental Processes

In yeast, the replication helicase MCM2-7 (minichromosome maintenance) complex enters the nucleus as an inactive double hexamer during mitosis.

TLS Online TPP Program

#Id: 2968

#Unit 3. Fundamental Processes

The presence of Cdc6 and Cdtl at the yeast origin allows the MCM proteins to bind to the complex in G I in the inactive state. Their presence is necessary forinitiation.

TLS Online TPP Program

#Id: 2969

#Unit 3. Fundamental Processes

In yeast,  The origin enters S phase in the condition of a prereplication complex, which contains ORC, Cdc6, Cdt1, and the inactive helicase, the MCM proteins

TLS Online TPP Program

#Id: 2970

#Unit 3. Fundamental Processes

The M C M 2 - 7 proteins form a six-member ring-shaped complex around DNA. MCM 2, 3, 5 are regulatory, while MCM4,6,7 have helicase activity.