Proteins are strings of amino acids. Proteins can perform many types of functions such as providing structure, informational signaling, or performing chemistry. Enzymes are proteins that accomplish chemical reactions.

Amino Acids

Amino Acid 3-letter 1-letter Structure
Alanine Ala A
Arginine Arg R
Asparagine Asn N
Aspartate Asp D
Cysteine Cys C
Glutamate Glu E
Glutamine Gln Q
Glycine Gly G
Histidine His H
Isoleucine Iso I
Leucine Leu L
Lysine Lys K
Methionine Met M
Phenylalanine Phe F
Proline Pro P
Serine Ser S
Threonine Thr T
Tryptophan Trp W
Tyrosine Tyr Y
Valine Val V
Amino Acid 3-letter 1-letter Structure
Pyrrolysine Pyl O
Selenocysteine Sec U

Protein Structure

Primary Structure

Secondary Structure

alpha-helix beta-sheet

Tertiary Structure


Quartenary Structure