What are the three levels of protein structure?
Different Levels of Protein Structure: The wide variety of 3-dimensional protein structures corresponds to the diversity of functions proteins fulfill. Proteins fold in three dimensions. Protein structure is organized hierarchically from so-called primary structure to quaternary structure. Higher-level structures are motifs and domains. Above all the wide variety of conformations is due to the huge amount of different sequences of amino acid residues. The primary structure is the sequence of residues in the polypedptide chain. Secondary structure is a local regulary occuring structure in proteins and is mainly formed through hydrogen bonds between backbone atoms. So-called random coils, loops or turns don’t have a stable secondary structure. There are two types of stable secondary structures: Alpha helices and beta-sheets. Alpha-helices and beta-sheets are preferably located at the core of the protein, whereat loops prefer to reside in outer regions. Tertiary structure describes the pa
