The rearrangement or permutation of protein substructures is an important mode of divergence. Recent explored one possible underlying mechanism called permutation-by-duplication, which produces special forms of motif rearrangements called circular permutations. Permutation-by-duplication, involving gene duplication, fusion and truncation, can produce fully functional intermediate proteins((1)) and thus represents a feasible mechanism of protein evolution. In spite of this, circular permutations are relatively rare and we discuss possible reasons for their existence.
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