Proteins

Derived from the Greek word protos that means I occupy

Importanance

• Take an essential part in the formation Of protoplasm.

• Nucleoproteins which are complexes of

• Proteins with nucleic acid serve as carriers of heredity.

• Enzymes are protein

• Proteins are an integral part of all viruses

• One gram of protein furnishes 4.1 kilocalories

• Have specialized functions e.g. hemoglobin, hormone

• Present in blood plasma as colloidal particle

• Plasma protein take part in blood coagulation

• Antibodies are proteins

• Act as transporting or carrier molecule

• Make complexes with carbohydrates and Lipids.

Classification

• Physico-chemical classification

• Functional classification

• Structural classification

Physico-chemical classification

• Simple proteins

• Compound proteins

• Derived proteins

Simple proteins

• Albumin

• Globulin

• Globin

• Prolamin

• Histones

• Protamin

• Albuminoids: keratin ,collagen ,elastin