Protein Structure
The proteins are an important class of present biological macromolecules in all the biological organisms, composed of the elements such as the coal, hydrogen, nitrogen, phosphorus, oxygen, and sulfide. In order to understand the functions of proteins at a molecular level, it is often necessary to determine the three dimensional structure of proteins. The primary structure is held together by covalent or peptide bonds, which are made during the process of protein biosynthesis or translation. These peptide bonds provide rigidity to the protein. Several the types of secondary structures are defined from their models of the ties of hydrogen between the groups of the peptide of the main-chain. However, these ties of hydrogen are not generally stable alone, since the tie of hydrogen of water-amide is generally more favorable of the tie of hydrogen of amide-amide.
All protein are the amino acid polymers. The polymers, also known under the name of polypeptides are composed of an order of 20 different L-a-amino acids, also indicated under the name of the residues. The tertiary structure of extracellular proteins can also be stabilized by disulfide bonds, which reduce the entropy of the unfolded state; disulfide bonds are extremely rare in cytosolic proteins, since the cytosol is generally a reducing environment. The generation of a protein sequence is much simpler than the generation of a protein structure. However, the structure of a protein gives much more insight in the function of the protein than its sequence. Proteins are formed by one or several polypeptide chains. The sequence of the polypeptide chain is defined by a gene with genetic code. There are only 20 standard amino acids are exists in living organism. Sometimes these amino acids are chemically modified in protein after the protein synthesis. Protein shakes and protein powder helps also to slow down the absorption down glucose into the bloodstream.
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