What do x-helices and B-sheets have in common?
Alpha helix and beta sheets are two types of secondary structure present in the protein structure. Alpha helical structure is a rod like structure its inner structure is formed by tightly coiled main chain, and its side chains extends outward in a helical array. Alpha helix consist of hydrogen bond between the -CO and -NH group within the polypeptide backbone (intrachain). While, beta sheets is a sheet like structure which is formed by the hydrogen bonds between the -CO and -NH group of adjacent polypeptide chains (interchain). Propensity of amino acids in alpha helix - MALEK and amino acids Proline is found as first aa in helical structure. Beta sheets contains higher propensity of amino acids like Gly and Ala (smaller side chain).
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