Nucleotide excision repair (NER) systems excise a sequence that includes the damaged base(s). a new stretch of DNA is then synthesized to replace the excised material.

TLS Online TPP Program

#Id: 3129

#Unit 3. Fundamental Processes

Before replication, the palindromic target site is methylated on the adenines of each strand.

TLS Online TPP Program

#Id: 3130

#Unit 3. Fundamental Processes

Replication inserts the normal (nonmodified) bases into the daughter strands. This generates hemimethylated DNA, in which one strand is methylated and one strand is unmethylated.

TLS Online TPP Program

#Id: 3131

#Unit 3. Fundamental Processes

Initiation may require full methylation of the Dam target sites in the origin, or it may be inhibited by hemimethylation of these sites.

TLS Online TPP Program

#Id: 3132

#Unit 3. Fundamental Processes

The GATC sites at the origin remain hemimethylated for -13 minutes after replication.

TLS Online TPP Program

#Id: 3133

#Unit 3. Fundamental Processes

Initiation at oriC requires the sequential assembly of a large protein complex on the membrane.

TLS Online TPP Program

#Id: 3134

#Unit 3. Fundamental Processes

The ability of a plasmid relying upon oriC to replicate in dam- E. coli depends on its state  of methylation.