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E. coli DNA ligase is commonly associated with which cofactor?

Answer and explanation

Correct answer: NAD⁺ / NAD plus

The relevant biochemical distinction is that the usual E. coli DNA ligase is NAD⁺-dependent, whereas bacteriophage T4 DNA ligase is commonly described as ATP-dependent. NAD⁺ participates in activation of the DNA-adenylate intermediate required for ligation, allowing the enzyme to seal a nick by forming a phosphodiester bond. Therefore option A, NAD⁺, is correct. ATP is an important cofactor for several other ligases, including T4 ligase, but “ATP only” is not the standard association for the E. coli enzyme in this school-level comparison. Chlorophyll is a photosynthetic pigment and starch is a storage carbohydrate, so neither is a ligase cofactor.

Related tags

E Coli Dna LigaseNad PlusEnzyme CofactorLigase EnzymesPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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