Lecture  Proteins Classification of protein A

Lecture Proteins Classification of protein A - Description

Classification based on solubility and composition simple conjugated and derived proteins i Simple proteins only amino acids Albumins salting out glycine Globulins insoluble or sparingly soluble in water methionine Prolamins brPage 2br lysine Glutel ID: 28384 Download Pdf

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Lecture Proteins Classification of protein A

Classification based on solubility and composition simple conjugated and derived proteins i Simple proteins only amino acids Albumins salting out glycine Globulins insoluble or sparingly soluble in water methionine Prolamins brPage 2br lysine Glutel

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Lecture Proteins Classification of protein A




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Page 1
Lecture 12 Proteins Classification of protein A. Classification based on solubility and composition simple, conjugated and derived proteins (i) Simple proteins only amino acids. Albumins 'salting out' glycine. Globulins insoluble or sparingly soluble in water methionine Prolamins
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lysine Glutelins insoluble in water absolute alcohol but soluble in dilute alkalies and acids. plant proteins Histones histidine globin of hemoglobin and nucleoproteins Protamines soluble in water and are not coagulated by heat arginine. Tyrosine and tryptophan Albuminoids

characterized by great stability and insolubility in water and salt solutions. ii. Conjugated or compound proteins simple proteins combined with some non-protein substances known as prosthetic groups.
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Nucleoproteins Mucoproteins simple proteins in combination with carbohydrates mucopolysaccharides hyaluronic acid and chondroitin sulphates. ovomucoid glycoproteins Chromoproteins coloured prosthetic groups Lipoproteins lipids such as neutral fat, phospholipids and cholesterol Metalloproteins metal-binding proteins transferrin iron, copper and zinc. ceruloplasmin copper.

Phosphoproteins phosphoric acid iii. Derived proteins
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primary-derived proteins and secondary-derived proteins. Primary-derived proteins Proteans myosan from myosin, fibrin from fibrinogen Metaproteins Coagulated proteins Secondary-derived proteins proteoses, peptones and peptides according to average molecular weight.
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b. Classification of prot eins based on function Catalytic proteins Enzymes function within the living cells as biocatalysts. biocatalysts enhance the reaction rates Regulatory protei ns - Hormones play highly important regulatory role in

maintaining order in complex metabolic reactions Protective proteins - Antibodies protective defense function antibody Fibrin blood Storage proteins storing amino acids as nutrients and as building blocks for the growing embryo source of essential amino acids globulins and prolamins in cereals.
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Transport proteins Haemoglobin globin ferroprotoporphyrin or haem Myoglobin, Lipids Toxic proteins Ricin castor bean Enzyme inhibitors such as trypsin inhibitor Lectin agglutinates red blood cells Snake venom Structural proteins structural materials or as important components of extra

cellular fluid. myosin of muscles, keratin of skin and hair and collagen of connective tissue. Contractile proteins actin and myosin Secretary proteins Fibroin Exotic proteins
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antifreeze glycoproteins C. Classification based on size and shape globular and fibrous proteins. Globular proteins enzymes, hormones and antibodies. Fibrous proteins