BIOCHEMISTRY BOOKS ALC&MOD MST/ET PKG
BIOCHEMISTRY BOOKS ALC&MOD MST/ET PKG
1st Edition
ISBN: 9780134172507
Author: APPLING
Publisher: Pearson Education
Question
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Chapter 5, Problem 15P
Interpretation Introduction

(a) Interpretation:

Acetylating agents such as acetic anhydride react preferentially with primary amines, iodoacetate reacts preferentially with sulfhydryl group, and ATP- dependent kinases preferentially add a phosphoryl group to side-chain hydroxyl or phenolic- OH groups. From this it should be identified which amino acid side chains or main-chain groups, in a polypeptide are most likely to be modified by treated with acetic anhydride.

Concept Introduction:

Amino acid has one central carbon atom which is capable of having four covalent bonds. The other four parts of amino acids are bound to each central carbon atom. A unique chemical group is bonded to each amino acid which is known as its side chain.

Proteins are large biological molecules made up of long chains of amino acid residues. Single polypeptide chain or two or more numbers of polypeptide chains are responsible for developing proteins. Proteins are the building block of the body. They have diverse functions like catalyzing metabolic reaction, DNA (deoxyribonucleic acid) replication, transporting hormones and other molecules throughout the body, and responding to different stimuli. Post-translational modification (PTM) is a biological process post protein translation in which enzymatic modification of protein takes place either during the process of translation or post protein biosynthesis.

Interpretation Introduction

(b) Interpretation:

Acetylating agents such as acetic anhydride react preferentially with primary amines, iodoacetate reacts preferentially with sulfhydryl group, and ATP- dependent kinases preferentially add a phosphoryl group to side-chain hydroxyl or phenolic- OH groups. From this it should be identified which amino acid side chains or main-chain groups, in a polypeptide are most likely to be modified by treated with iodoacetate.

Concept Introduction:

Amino acid has one central carbon atom which is capable of having four covalent bonds. The other four parts of amino acids are bound to each central carbon atom. A unique chemical group is bonded to each amino acid which is known as its side chain.

Proteins are large biological molecules made up of long chains of amino acid residues. Single polypeptide chain or two or more numbers of polypeptide chains are responsible for developing proteins. Proteins are the building block of the body. They have diverse functions like catalyzing metabolic reaction, DNA (deoxyribonucleic acid) replication, transporting hormones and other molecules throughout the body, and responding to different stimuli. Post-translational modification (PTM) is a biological process post protein translation in which enzymatic modification of protein takes place either during the process of translation or post protein biosynthesis.

Interpretation Introduction

(c) Interpretation:

Acetylating agents such as acetic anhydride react preferentially with primary amines, iodoacetate reacts preferentially with sulfhydryl group, and ATP- dependent kinases preferentially add a phosphoryl group to side-chain hydroxyl or phenolic- OH groups. From this it should be identified which amino acid side chains or main-chain groups, in a polypeptide are most likely to be modified by treated with kinase + ATP.

Concept Introduction:

Amino acid has one central carbon atom which is capable of having four covalent bonds. The other four parts of amino acids are bound to each central carbon atom. A unique chemical group is bonded to each amino acid which is known as its side chain.

Proteins are large biological molecules made up of long chains of amino acid residues. Single polypeptide chain or two or more numbers of polypeptide chains are responsible for developing proteins. Proteins are the building block of the body. They have diverse functions like catalyzing metabolic reaction, DNA (deoxyribonucleic acid) replication, transporting hormones and other molecules throughout the body, and responding to different stimuli. Post-translational modification (PTM) is a biological process post protein translation in which enzymatic modification of protein takes place either during the process of translation or post protein biosynthesis.

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12. When glutamic acid is heated to 180°C., it loses a molecule of water to form a lactam. The bond that creates the lactam is an amide bond that forms between the amino nitrogen and the carbon of the side chain -COOH group. What is the most reasonable structure for this lactam? (NOTE: The structure of glutamic acid is shown in Question 1.) COOH COOH ا کچھ جو کچھ C D COOH B COOH E COOH
10. Which one of the following compounds is the major organic product of the series of reactions shown here? Ph A OH Ph B CO₂Et Br -H Ν ΚΑ CO₂Et 1. NaOEt 1. NaOH, H₂O 2. H3O+ 2. PhCH2CH2Br 3. heat NH2 Ph OH NH2 0 OH Ph OH NH2 Ph D NH2 E OH
1. What is the isoelectric point of glutamic acid? (Glutamic acid has pKa1 2.10, pKa2 4.07, pKaз 9.47) A) pH 2.1 D) pH 6.8 B) pH 3.1 C) pH 4.1 E) pH 9.5 HO NH2 Glutamic acid (shown without charges) OH
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