Proteins are simply chains of amino acids that are linked together in different ways. Amino acids are divided into two general groups: those essential in our diet (must be obtained from food), and those that are non-essential in our diet (can be made in our bodies by different amino acids). The essential amino acids include leucine, isoleucine, valine, lysine, threonine, tryptophan, methionine, penylalanine, and histidine. The non-essential amino acids include arginine, alaninie, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, prolene, serine, and tyrosine. Complete proteins contain all of the essential amino acids in balanced proportion. Most animal and certain vegetable proteins are complete.
Protein function is typically dependent upon its shape. The ‘tertiary structure’ refers to how amino acid sequences are folded upon each other to give each protein its unique shape, and therefore function.
Proteins serve as the major structural component of all the cells in our bodies, and are second only to water in abundance. We need proteins for proper growth and maintenance, and for many routine body functions including the production of hemoglobin (our blood cells that carry oxygen), formation of antibodies to fight foreign threats, and supply the nitrogen needed to make DNA and RNA. Read the rest of this entry »