Fundamentals of Biochemistry: Life at the Molecular Level
Fundamentals of Biochemistry: Life at the Molecular Level
5th Edition
ISBN: 9781118918401
Author: Donald Voet, Judith G. Voet, Charlotte W. Pratt
Publisher: WILEY
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Chapter 26, Problem 2E

(a)

Summary Introduction

To write: An equation for mRNA phosphorolysis reaction.

Introduction: Polynucleotide phosphorylase (PNPase) is an exoribonuclease that is involved in the degradation and processing of mRNA. It catalyzes 3ʹ-5ʹ phosphorolysis reaction using inorganic phosphate for degradation and nucleotide diphosphate (NDP) for polymerization process.

(b)

Summary Introduction

To explain: How PNPase accomplish the reverse of phosphorolysis reaction in vitro and how it differs from the reaction carried out by RNA polymerase.

Introduction: Polynucleotide phosphorylase (PNPase) is an exoribonuclease that is involved in the degradation and processing of mRNA. It catalyzes 3ʹ-5ʹ phosphorolysis reaction using inorganic phosphate for degradation and nucleotide diphosphate (NDP) for polymerization process.

(c)

Summary Introduction

To explain: How the property of PNPase having a binding site for long ribonucleotides is an advantage for its primary activity in vivo.

Introduction: Polynucleotide phosphorylase (PNPase) is an exoribonuclease that is involved in the degradation and processing of mRNA. It catalyzes 3ʹ-5ʹ phosphorolysis reaction using inorganic phosphate for degradation and nucleotide diphosphate (NDP) for polymerization process.

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