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Lecture 9

KIN 346 Lecture 9: Protein


Department
Kinesiology
Course Code
KIN346
Professor
Danny M Pinicero
Lecture
9

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122
KIN 346 Human Nutrition
D.M. Pincivero, Fall 2016
LECTURE - PROTEIN
WHAT ARE PROTEINS?
Protein, Greek derivative “protos”, meaning “of prime importance”
Organic molecules
2nd most abundant component of plants and animals (2nd to water)
Food sources:
Animal-based food (meat, fish, milk)
Plant sources: dried beans, peas, nuts, seeds, some vegetables
WHAT ARE PROTEINS?
Assemblies of amino acids
What is an amino acid?
How many amino acids?
20 (same 20 in all animals), 9 are essential, 11 are non-essential
Essential amino acid:
Refers to an amino acid that the body CANNOT synthesize….must be ingested.
Non-essential amino acid:
Refers to an amino acid that the body CAN synthesize.
Conditionally essential amino acids
Examples:
Tyrosine is made from phenylalanine
Cysteine is made from methionine

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123
KIN 346 Human Nutrition
D.M. Pincivero, Fall 2016
Conditionally essential amino acids (cont'd)

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124
KIN 346 Human Nutrition
D.M. Pincivero, Fall 2016
Primary structure: formation of a DIPEPTIDE
Tripeptide = 3 amino acids
Oligopeptide = 4-10 amino acids
Polypeptide > 10 amino acids
Most natural polypeptides = 50-200 amino acids…..called a PROTEIN
PROTEIN STRUCTURE
So how many different proteins can we form?
Example:
Polypeptide length = 200 amino acids (most common length)
How many amino acids to choose from? 20
Therefore, calculate:
Number of different protein = 20200= ??
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