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Biochemistry

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Amino Acids, Proteins and Porphyrins

Question
8 out of 107
 

Albumins and globulins are proteins



A Simple
B Derived

C Conjugated
D Structural

E Lipoproteins

Ans. A simple protein

Classification of proteins

A. Simple proteins (on complete hydrolysis yield only amino acids)

a. Albumin: - coagulated by Heat and ppt by saturating (full saturation) with Nl-L (salt), deficit in

glycineeg. serum Albumin, Egg albumin, Lactalbumin (milk) Leucosin (cereals wheat) Legumelin

(soybeans)

b. Globulins — coagulated by Heat, ppt. by half salt saturation insoluble in water. Eg. serum globulin

Legumin (pea) Tuberin

c. A. Glutamines — rich in glutamic acids egGlutenin (wheat) oryzenin (rice)

B. Prolamines soluble in 50-80% alcohol but insoluble in absolute alcohol * rich in proline but

poor in lysine egGliadin (wheat) Zein (maize)

d. Protamines Basic protein do not contains cysteine Tryptophan and tyrosine but rich in Arginine. * Not coagulated by Heat Egsalmine, sardinine and cyprinine of fish (salmon) sperm and testies

e. Histones eg globin of HbNucleohistone thymus histones

f. Scieroproteins (Albuminoids) eg Keratin collagen and Elastins

B. Conjugated proteins (simple proteins combines with prosthetic groups):-

a. Nucleoproteins — eg. Nucleoproteins and Nucleohistone

b. Lipoproteins

c. Glycoprotein eg. Mucin,

d. Phosphoproteineg. caseinogen (milk), ovovitellin (egg yolk)

e. Metalloproteinseg. siderophilin (Fe), ceruloplasmin (Cu)

f. Chromoproteinscontain porphyrineg. Hemoglobin (Fe) cyto. Oxidase, catalase, peroxidases.

g. Flavo protein, visual purple

C. Derived Proteins: -

a. Primary derivatives (denaturated protein in which peptide bonds remains intact): eg.

i. Proteins — in early stage of hydrolysis eg. fibrin from fibrinogen

ii. Metaprotein: (in later stage) eg. Acid and alkali metaproteins

iii. Coagulated proteins cooked protein

b. Secondary Derivatives — Due to cleavage of peptides bonds.

i. Proteosesby action of pepsin or trypsin Eg. Albumose from Albumin, globulose from

globulin

ii. B. Peptones further stage of cleavage than the proteoseseg. proteins product by Enzymatic digestion.

iii. Peptides eg. di-, tri, and polypeptides.

Amino Acids, Proteins and Porphyrins Flashcard List

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