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Nucleic Acid Base Modifications and Nucleotide Functions Study Guide

This guide covers the chemical modifications of nucleic acid bases, such as deamination, hydrolysis, radiation damage, alkylation, and methylation. It also details the essential roles of nucleotides beyond their structural function in DNA and RNA, including their involvement in energy transfer (ATP), as enzyme cofactors (NAD+, FAD, Coenzyme A), and as signaling molecules (cAMP, cGMP). Understanding these modifications and functions is crucial for comprehending DNA integrity, mutation, and cellul

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Structure and Functions of Nucleotides

Structure and Functions of Nucleotides

Nucleotides are organic compounds consisting of a nitrogenous base, a pentose sugar, and a phosphate group that serve as structural units of DNA and RNA.

  • DNA
  • RNA
  • Ribosomal RNA
  • Messenger RNA
  • Transfer RNA
  • Nucleotides
  • Nitrogenous base
  • Pentose sugar
  • Phosphate group
  • Purines
  • Pyrimidines
  • Ribose
  • Deoxyribose
  • N-beta-glycosyl bond

Chemistry and Structure of Nucleic Acids

Purine and Pyrimidine Nucleic Acid Bases

DNA and RNA contain purine and pyrimidine bases, pentoses, nucleosides, and nucleotides including major and minor bases.

  • Purine and Pyrimidine Bases
  • Cytosine
  • Uracil
  • 2’-Deoxyribose
  • D-ribose
  • β-furanose
  • Nucleosides
  • Nucleotides
  • Deoxyadenosine
  • Deoxyguanosine
  • Deoxycytidine
  • Deoxythymidine
  • Adenosine
  • Cytidine
  • Minor bases

Chemistry and Structure of Nucleic Acids

Nucleic acids consist of polynucleotides linked by phosphodiester bonds, featuring purine and pyrimidine bases that influence structure, solubility, and UV light absorption.

  • phosphodiester bonds
  • polynucleotides
  • oligonucleotides
  • nonenzymatic hydrolysis
  • purines and pyrimidines
  • resonance
  • UV light absorption
  • hydrogen bonds
  • DNA forms (A, B, and Z)
  • denaturation
  • renaturation
  • hybridization

Base Modifications and Other Nucleotide Functions

Nucleic Acid Base Modifications and Nucleotide Functions

This topic explores spontaneous alterations in purines and pyrimidines, DNA mutations, and the diverse biological functions of nucleotides.

  • Base modifications
  • Deamination of bases
  • Hydrolysis of the N-glycosyl bond
  • Cyclobutane pyrimidine dimers
  • Alkylation
  • DNA methylation
  • Nucleotide functions
  • Coenzyme A
  • Nicotinamide adenine dinucleotide (NAD+)
  • Cyclic AMP
  • Cyclic GMP

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