Biochemistry (Looseleaf)
Biochemistry (Looseleaf)
9th Edition
ISBN: 9781319114800
Author: BERG
Publisher: MAC HIGHER
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Chapter 29, Problem 1P
Interpretation Introduction

Interpretation:

The activated intermediate present in the linkage of the enzymes, DNA polymerase I, DNA ligase and topoisomerase I are to be stated. The leaving groups present in the enzymes are to be stated.

Concept introduction:

DNA stands for deoxyribonucleic acid, is a biological macromolecule. DNA contains double helical strands along with the complementary base pairs. The four complementary bases of DNA are adenine (A), thymine (T), guanine (G) and cytosine (C). In the formation of recombinant DNA, the restriction enzymes are involved to cut the particular region in the DNA molecule.

Expert Solution & Answer
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Answer to Problem 1P

The activating intermediate present in the linkage of the enzymes, DNA polymerase I, DNA ligase and topoisomerase I are deoxynucleotide triphosphate, DNA adenylate and DNA-tyrosyl intermediate respectively. The leaving groups present in the enzymes, DNA polymerase I, DNA ligase and topoisomerase I are pyrophosphate, AMP and DNA- tyrosine residue respectively.

Explanation of Solution

It is given that the enzymes, DNA polymerase I, DNA ligase and topoisomerase I help in catalyzing the formation of phosphodiaster bonds.

The activated intermediate present in case of DNA polymerase I is deoxynucleotide triphosphate and the leaving group present in this enzyme is pyrophosphate.

The activated intermediate present in case of DNA ligase is DNA adenylate, in which AMP is attached to 5' phosphate and the leaving group present in this enzyme is adenosine monophosphate(AMP).

The activated intermediate present in case of topoisomerase I is DNA-tyrosyl intermediate, in which 5' phosphate is attached to phenolic OH group and the leaving group present in this enzyme is the tyrosine residue.

Conclusion

The activating intermediate present in the linkage of the given enzymes are deoxynucleotide triphosphate, DNA adenylate and DNA-tyrosyl intermediate respectively. The leaving groups present in the enzymes are pyrophosphate, AMP and DNA- tyrosine residue respectively.

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