Proteins
Proteins
Definition z Protein from the Greek proteios, meaning primary. z Proteins are the work horses of biological systems. – They play key roles in constructing and maintaining living cells z Our genes code for proteins z Proteins are polymers of amino acids
Definition z Protein from the Greek proteios, meaning primary. z Proteins are the work horses of biological systems. – They play key roles in constructing and maintaining living cells z Our genes code for proteins z Proteins are polymers of amino acids
Proteins are: Polypeptides + (cofactors, coenzymes, prosthetic groups, other modifications) z Polypeptides are covalently linked α-amino acids z Cofactors are non-amino acid components e.g. metal ions like Zn2+ in carboxypeptidase z Coenzymes are organic cofactors e.g. nucleotides in lactate dehydrogenase z Prosthetic groups are covalently attached cofactors e.g. heme in myoglobin
Proteins are: Polypeptides + (cofactors, coenzymes, prosthetic groups, other modifications) z Polypeptides are covalently linked α-amino acids z Cofactors are non-amino acid components e.g. metal ions like Zn2+ in carboxypeptidase z Coenzymes are organic cofactors e.g. nucleotides in lactate dehydrogenase z Prosthetic groups are covalently attached cofactors e.g. heme in myoglobin
Roles played by proteins include z Enzymes (biological catalysts) z Hormones z Storage proteins z Transport proteins z Structural proteins z Protective proteins z Contractile proteins z Toxic proteins
Roles played by proteins include z Enzymes (biological catalysts) z Hormones z Storage proteins z Transport proteins z Structural proteins z Protective proteins z Contractile proteins z Toxic proteins
Food Proteins z Palatable z Digestible z Non-toxic z Available Economically
Food Proteins z Palatable z Digestible z Non-toxic z Available Economically