Opening oriC involves action at two types of sequence in the origin: 9-bp and 13 -bp repeats.

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.

TLS Online TPP Program

#Id: 2954

#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. This means that the average length of a replicon is -35,000 bp.

TLS Online TPP Program

#Id: 2955

#Unit 3. Fundamental Processes

ORC was first found in S. cerevisiae (where it may be called scORC),but similar complexes have now been characterized in Schizosaccharomyces pombe (spORC), Drosophila (DmORC ), and Xenopus (XIORC).

TLS Online TPP Program

#Id: 2956

#Unit 3. Fundamental Processes

ORC is an initiation complex whose binding identifies an origin of replication.

TLS Online TPP Program

#Id: 2957

#Unit 3. Fundamental Processes

The yeast ARS elements satisfy the classic definition of an origin as a cis-acting sequence that causes DNA replication to initiate.