5' to 3' exonuclease activity is seen in:
Proof reading
Repair of damaged DNA
DNA synthesis
DNA polymerase
Ans. (b) Repair of damaged DNARef: Harpers Biochemistry, 30th ed. pg. 389-90Two types of exonuclease activity has been described:* 5' to 3' exonuclease activity: responsible for cleavage of phosphodiester bond starting from 5' end of the strand. It is considered as the error correcting activity in damaged DNA.* 3' to 5' exonuclease activity: responsible for cleavage of phosphodiester bond starting from 3' end of the strand. This activity provides a means for proofreading if in case any wrong base is mistakenly incorporated by DNA polymerase III during DNA synthesis.
Proteins and Amino Acids