Proteins can be classified on many different bases as:
on the basis of chemical nature and solubility: It is based on the amino acid composition and is divided into three major classes as
SIMPLE...
They may be integral (transmembrane) or peripheral (attached to membrane or integral proteins). Different membrane proteins may be ion channels (ligand-gated, voltage-gated), cytoskeleton related...
We should note that enzymes are proteineous but not all enzymes are protein,actually it depends in the sequence of the amino acid polymerization,for instance in the change of valine of normal...
This is far too complicated to give a detailed answer to here, but a brief overview: A portion of a DNA sequence is transcribed to an mRNA strand.The mRNA strand is translated into a peptide sequence...