In alpha helix structure of protein, carbonyl group oxygen bonded with amine hydrogen as a hydrogen bond. The alpha helix (-helix) is a right-hand helix shape wherein every backbone NH group hydrogen bonds to the backbone C=O. group of the amino acid four positions ahead in the protein.
Alpha () amino acids are a protein's main building block. As their name suggests, they have both an amine functional group and a carboxylic acid functional group. These two functional groups are separated from one another by one carbon group, as indicated by the alpha designation. The alpha carbon is also joined to a hydrogen and a third group, which can be any size or length, in addition to the amine and carboxylic acid. This group is shown as an R-group in the diagram below. Twenty amino acids are employed as the building blocks for proteins in living things. Only at the R-group position do they diverge from one another.The fundamental structure of a protein is only the arrangement of the amino acids in a polypeptide chain. For instance, the polypeptide chains A and B of the hormone insulin.
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