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Chapter 25: Q21CP (page 915)

What are the functions of DNA phtolyases and alkytransfarses?

Short Answer

Expert verified

The enzymes Photolyase and alkytranferases are the phylogenetically old enzymes which is present and junctional in many species.

Step by step solution

01

Step-1: Photolyase Reactivity 

DNA photolyase are the photo reactivating enzymes that convert light energy to chemical energy to break the cyclo-butane ring in the pyrimidine dimers of the DNA.

02

Step-2: Alkytranferases Effect 

Thus, these enzymes prevent the lethal remutagenic effect of UV repair of DNA. Alkytranferases are the widely distributed unique DNA repair protein that acts as a single agent to directly remove alkyl group of gualine is restoring DNA.

Hence, DNA photolypase to alkyltransferoses are unique in as functions in the DNA repair mechanism.

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Most popular questions from this chapter

How many sliding clamps and clamp loading events are required for synthesis of the leading and lagging strands?

E.coli ori C is rich in A 路 T base pairs. Why is this advantageous?

What is the function of the pre-replication complex?

What is the role of the metal ions in the polymerase active site?

In E. coli, all newly synthesized DNA appears to be fragmented (an observation that could be interpreted to mean that the leading strand as well as the lagging strand is synthesized discontinuously). However, inmutants that are defective in uracil鈥揇NA glycosylase, only about half the newly synthesized DNA is fragmented. Explain.
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