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Which of the following is not a function of APE1?(a) 5’->3’ exonuclease(b) Generating nick at 5’ end(c) Generating abasic site(d) Improving fidelity of pol betaThis question was addressed to me in an international level competition.My enquiry is from Repair of DNA Damage: MMR, BER in division DNA Mutation, DNA Repair, Transposable Elements of Cytogenetics

Answer»

The correct CHOICE is (C) GENERATING abasic site

Explanation: While APE1 has a 5’-> 3’ exonuclease activity, it is not a BIFUNCTIONAL glycosylase and can’t generate an abasic site.



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