Domanda del libro di testo
The first amino acid in the pentapeptide of Figure 26.50, Pyr, is not one of the 20 amino acids in Table 26.1. Based on the following structure of Pyr, from which natural amino acid is it likely derived?
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Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases/Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 26 - Amino Acids, Proteins, and Peptide SynthesisProblema 46b
Mullins 1st EditionCh. 26 - Amino Acids, Proteins, and Peptide SynthesisProblema 46bCapitolo 25, Problema 46b
Draw the following amino acids in all possible protonation states as you move from high pH to low pH.
b. His
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Identify the functional groups in histidine: an amino group (-NH2), a carboxyl group (-COOH), and an imidazole side chain.
At high pH, all groups are deprotonated. Draw histidine with the amino group as -NH2, the carboxyl group as -COO-, and the imidazole ring with a neutral nitrogen.
As the pH decreases, the carboxyl group will protonate first. Draw histidine with the carboxyl group as -COOH, while the amino group remains -NH2 and the imidazole ring remains neutral.
At a lower pH, the imidazole ring will protonate. Draw histidine with the imidazole ring having a positively charged nitrogen, while the carboxyl group is -COOH and the amino group is still -NH2.
At the lowest pH, the amino group will protonate. Draw histidine with the amino group as -NH3+, the carboxyl group as -COOH, and the imidazole ring with a positively charged nitrogen.
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Amino Acid Structure
Amino acids are organic compounds composed of an amino group, a carboxyl group, a hydrogen atom, and a distinctive side chain (R group) attached to a central carbon atom. Histidine, specifically, has an imidazole ring in its side chain, which plays a crucial role in its behavior under varying pH conditions.
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7:19
Charged Amino Acids
Protonation States
Protonation states refer to the different forms an amino acid can take depending on the pH of the environment. As pH decreases, amino acids gain protons, affecting their charge and structure. Histidine can exist in multiple protonation states due to its imidazole ring, which can accept or donate protons.
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03:08Ground vs. Excited States
pH and Amino Acid Ionization
The pH of a solution influences the ionization of amino acids, affecting their charge and solubility. At high pH, amino acids tend to lose protons, becoming negatively charged, while at low pH, they gain protons, becoming positively charged. Understanding the pKa values of functional groups in histidine is essential for predicting its behavior across different pH levels.
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04:10The 7 Ionizable Amino Acids
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