Protein and Peptide Letters 2005-Jul
Structure and folding of potato type II proteinase inhibitors: circular permutation and intramolecular domain swapping.
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Potato type II serine proteinase inhibitors are proteins that consist of multiple sequence repeats, and exhibit a multidomain structure. The structural domains are circular permutations of the repeat sequence, as a result of intramolecular domain swapping. Structural studies give indications for the origins of this folding behaviour, and the evolution of the inhibitor family.