Once the prepriming complex is loaded onto the replication forks, the next step is the recruitment of the primase, DnaG, which is then loaded onto the DnaB hexamer.

TLS Online TPP Program

#Id: 2948

#Unit 3. Fundamental Processes

Related ORC complexes are found in multicellular eukaryotes.

TLS Online TPP Program

#Id: 2949

#Unit 3. Fundamental Processes

an ARS for autonomously replicating sequence, ARS elements are derived from origins of replication.

TLS Online TPP Program

#Id: 2950

#Unit 3. Fundamental Processes

An ARS element consists of an A-T-rich region that contains discrete sites in which mutations affect origin function.

TLS Online TPP Program

#Id: 2951

#Unit 3. Fundamental Processes

An ARS extends for -so bp and includes a consensus sequence (A} and additional elements (B1-B3).

TLS Online TPP Program

#Id: 2952

#Unit 3. Fundamental Processes

Mutations in three adjacent elements, numbered B 1 to B3, reduce origin function.

TLS Online TPP Program

#Id: 2953

#Unit 3. Fundamental Processes

By counting the number of sites to which ORC binds, we can estimate that there are about 400 origins of replication in the yeast genome.