HNSC 1200 Chapter Notes - Chapter 6: Protein Structure, Beta Sheet, Protein Quality
13 May 2017
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Several dozen to 300 amino acids join to form a protein. The strand of protein does not remain in a straight chain. The electrical charges of the amino acids (caused by the side chain) cause the strand to bend and coil, as amino acids attract and repel one another. This forms either a globular shape (soluble in water), or a fibrous shape (insoluble in water) The amino acids with electrically charged side chains attract water and are oriented on the outside of the protein structure. The neutral amino acids repel water and are attracted to one another, so orientate in the centre of the protein away fro body fluids. These interactions give each protein a unique structure. Repeating pattern of linear amino acids; alpha-helix (coiling) or beta sheet: tertiary. Three dimensional shape, coils fold back on themselves resulting gin a more compact, globular shape: quaternary, globular proteins combined with each other; more complex structure (e. g. , hemoglobin, insulin)
