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