Chapter-16 Composition and Metabolism of Amino Acids and Proteins

BOOK TITLE: Essentials of Nutrition and Biochemistry for Basic BSc Nursing

1. Clement I
Publishing Year
Author Affiliations
1. RV College of Nursing, Bengaluru, Karnataka, India; Columbia College of Nursing, VSS College of Nursing, Bengaluru, Karnataka, India; Rajiv Gandhi University of Health Sciences, Bengaluru, Karnataka, India; Christian Medical Association of India, New Delhi, Indian Society of Psychiatric Nursing, Bengaluru, Medical Surgical Nursing Society of ndia, Chennai; Indian Society of Neuroscience Nursing, New Delhi; Asian Association of Cardiac Nurses, Kolkata, West Bengal, India; Indian Red Cross Society, Bengaluru, St. Johns Ambulance Association, Bengaluru; National Editorial Advisory Board, New Delhi, Nurses of India (Former) Bengaluru
Chapter keywords
Amino acid, protein, protein metabolism, urea cycle, niacin, melanin, thyroid hormone, catecholamines, protein metabolism disorder, nonprotein nitrogenous substance


This chapter describes the composition and metabolism of amino acids and proteins. Proteins contain carbon, hydrogen, nitrogen and sulfur as major constituents. Some proteins also contain phosphorus as the chief constituent. Proteins are present as the main constituent of all living matter. Proteins are among the central molecules of biology. Proteins transmit and commute signals from the external environment to cell interior, duplicate genetic information, transform the energy in light, carryout chemical reactions with tremendous efficiency, transport molecules between cell compartments, etc. This chapter covers the importance of protein, general properties of protein, classifications of protein, color reaction of proteins, amino acid, classifications of amino acids, properties of amino acids, functions of amino acids, digestion and absorption of proteins, mechanism of amino acid absorption, biosynthesis of protein, protein metabolism, urea cycle, formation of niacin, formation of melanin, formation of thyroid hormone, formation of catecholamines, protein metabolism disorders, and nonprotein nitrogenous substances.

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