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Naturally occurring peptides, such as those produced by the poisonous marine snails of the genus Conus , have the ability to form tight, highly specific molecular interactions. The rigidity of the peptide framework which promotes these interactions is usually maintained by disulphide bonds, and it seems that the overall main chain conformation (or fold) of the peptide is determined by its length and the sequence distribution of the pairs of cysteine residues participating in these bonds. The fold of the peptide in turn is largely responsible for its shape. Since highly effective molecular interactions occur between species complementary in shape, we reasoned that peptides with the greatest potential in therapy or diagnosis would be found in a library of shapes, those peptides with a shape complementary to a given target being identified, for example, by selection. As a first step towards constructing such a peptide shape library, we have developed a method for assembling DNA fragments which encode an even number of cysteine residues and which are of variable length. We describe this method here.

Sticky egyptians: a technique for assembling genes encoding constrained peptides of variable length