β structures of alternating polypeptides and their possible prebiotic significance

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Abstract
A survey of the commonest amino acids formed in prebiotic conditions suggests that the earliest form of genetic coding may have specified polypeptides with a strong tendency to form stable Beta-sheet structure. Poly(Val-Lys), like other polypeptides in which hydrophobic and hydrophilic residues alternate, tends to form Beta structures. We show that bilayers with a hydrophobic interior and a hydrophilic exterior may be present in aqueous solution.