PROTEINS

C

C

N

R

H

H

H

O

O

H

.

STRUCTURE OF A PROTEIN- The R group is different for all 20 amino acids

PRIMARY STRUCTURE

SECONDARY STRUCTURE

TERTIARY STRUCTURE

QUATERNARY STRUCTURE

sequence of amino acid chain

hydrogen bonds causes amino acids to fold into beta pleated sheet or alpha helix

the amino acids fold again and the types of bonds occur- hydrophilic/phobic interactions, ionic bonds, disulphide bonds.

has α- and β- subunits. an example of this is haemoglobin

GLOBULAR

CONJUGATED

FIBROUS

globular proteins are compact and water soluble an example of this is insulin

Conjugated proteins have a non protein component called a prosthetic group. an example of this is haemoglobin

are long insoluble molecules. an example of this is keratin