Nucleotides and Nucleic Acids
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1 Nucleotides and Nucleic Acids Brief History Miescher Isolated nuclein from soiled bandages Garrod Studied rare genetic disorder: Alkaptonuria; concluded that specific gene is associated with absence of a specific enzyme Sutton Chromosome structure Morgan Gene mapping Sumner Purified Urease; identified enzyme to be proteins Griffith Transforming Principle a chemical transferred from dead bacteria to living cells caused genetically converted strains ( transformation ) Avery, McCarty, and Macleod Identified Griffith s transformation principle as DNA Chargaff Base pairing 1950 s - Franklin X-ray of DNA Watson and Crick DNA double helix Three components make up a nucleotide: 1. Heterocyclic base either a pyrimidine or a purine - Heterocyclic molecule with at least one ring containing an atom other than carbon 2 Pyrimidine aromatic organic compound with 2 nitrogens at C1 & C3 of a sixmembered ring Hardinger. Chem14C Thinkbook. p. 101.
2 o Pyrimidines in DNA & RNA: Purine aromatic organic compound that consists of a pyrimidine ring and an imadazole ring (C 3 H 4 N 2 ). o Purines in DNA & RNA: o Other common purines: Caffeine Theobromine (found in chocolate) - Properties of pyrimidines & purines - Pyrimidine conformations are planar; purines are somewhat puckered - Plain pyrimidines and purines have low solubility (not many polar bonds)
3 - Cytosine, Thymine, Uracil, Guanine, and Adenine are more soluble because they have many polar groups that are available for hydrogen bonding. - Because they are aromatic, pyrimidines and purines can all absorb UV light. - DNA & RNA concentration in a sample can be found by measuring UV absorbance Carbohydrate The carbohydrate component consists of a sugar, which is usually a pentose. Each nucleic acid has a different carbohydrate. Note: Superscript prime is used to number the carbons when a heterocyclic base is attached to the carbohydrate (i.e. 1, 2 instead of 1, 2). 3. Phosphoric acid forms phosphodiester bonds between nucleotides Phosphoric acid Nucleosides - formed by covalently joining the sugar to a heterocyclic base (bond formed is called a glycosidic bond.) Nucleotides - formed by joining phosphoric acid to a nucleoside at the C5 or the C3. Helpful mnemonic (maybe): Nucleotides = has two groups joined to the sugar. Nucleoside = has only a nitrogenous base joined to one side. 3
4 Nucleoside Nomenclature 4 - add suffix -idine to pyrimidine; add -osine to purine. - Pyrimidine nucleosides: Cytidine, Thymidine, Uridine - Purine nucleosides: Adenosine, Guanosine Conformations of bases in Nucleosides 5 - syn and anti orientations - Rotation around glycosidic bond has a slight barrier because of the H on the C2 of the ribose. DNA - Deoxyribonucleic Acid polymer of nucleic acids (polynucleotide) - Functions as storage for genetic information. - DNA polymerase is used to catalyze the synthesis of DNA. Synthesis occurs in the 5 3 direction. - Each strand of the double helix is orientated in the opposite direction. - DNA is acidic due to the phosphate groups between each 2 deoxyribose. - Contains Adenine, Guanine, Cytosine, and Thymine - Primary structure: nucleic acid sequence; Secondary structure: double helix; Tertiary structure: nucleic acids supercoil and wrap around histones (proteins) - In eukaryotic cells (plants, animals, fungi, & protists), DNA is located in the cell nucleus. - In prokaryotic cells (eubacteria & archaea), DNA is located in the nucleoid; there is no nuclear envelope to separate DNA from the cytoplasm. RNA - Ribonucleic Acid polymer of nucleic acids (polynucleotide) - Functions as template for translating genes into proteins, transfers amino acids to the ribosome site on a growing polypeptide chain, etc. - Unlike DNA, RNA is single-stranded and consists of a shorter nucleotide chain
5 - Hydroxyl group on the ribose causes RNA to be less stable than DNA because it is easier to undergo hydrolysis. - Contains Adenine, Guanine, Cytosine, and Uracil - Many types of RNA 6 Examples: - mrna Messenger RNA; brings information from DNA to ribosome sites for protein synthesis. - trna Transfer RNA; transfers a specific amino acid to a polypeptide chain during the translation phase of protein synthesis. Chargaff s Rules - A pairs with T (ratio 1:1); G pairs with C (ratio 1:1) Note: Ratios are random in RNA 6
6 Stability of DNA - DNA must be stable in order to store genetic information. What accounts for DNA s stability? - Aromatic Stacking - Weak noncovalent force caused by overlapping of p-orbitals; also called pi stacking. In DNA, aromatic stacking between the nucleotides contributes to its stability. The pyrimidine and purine bases, which are parallel to each other in DNA, participate in aromatic stacking due to the overlap of their p-orbitals. - Hydrogen Bonding - Millions of hydrogen bonds in DNA is the main structural feature that explains why DNA is stable. Hydrogen bonding is strong, but can easily be broken for DNA replication. Practice problem: Coenzyme A (acetyl CoA) is important in the oxidation of fatty acids and lipid biosynthesis (ie. from acetyl CoA to cholesterol). 7 Its structure is shown above. 1. Which heterocyclic base is a part of acetyl CoA? 2. Which carbohydrate is a part of acetyl CoA? Answers: 1. Adenine 2. Ribose * Pictures taken from or unless otherwise stated. 7
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