The Process of Restoring DNA After Damage. Genomes Are Subject to Damage by Chemical and Physical Agents in the Environment (e.g. Uv and Ionizing Radiations Chemical Mutagens Fungal and Bacterial Toxins Etc.) and by Free Radicals or Alkylating Agents Endogenously Generated in Metabolism. DNA Is Also Damaged Because of Errors During Its Replication. a Variety of Different DNA Repair Pathways Have Been Reported That Include Direct Reversal Base Excision Repair Nucleotide Excision Repair Photoreactivation Bypass Double Strand Break Repair Pathway and Mismatch Repair Pathway.
A Membrane Bounded Organelle of Eukaryotic Cells in Which Chromosomes Are Housed and Replicated. in Most Cells the Nucleus Contains All of the Cell's Chromosomes Except the Organellar Chromosomes and Is the Site of RNA Synthesis and Processing. in Some Species or in Specialized Cell Types RNA Metabolism or DNA Replication May Be Absent.
Pyrimidine Specific Mismatch Base Pair DNA N Glycosylase Activity
Catalysis of the Removal of Mismatched Pyrimidine Bases in Dna. Enzymes with This Activity Recognize and Remove Pyrimidines Present in Mismatches by Cleaving the N C1' Glycosidic Bond Between the Target Damaged DNA Base and the Deoxyribose Sugar. the Reaction Releases a Free Base and Leaves an Apyrimidinic (ap) Site.