[structure: see text] Matriptase is a member of the emerging class of type II transmembrane serine proteases. It was found that the sunflower trypsin inhibitor (SFTI-1), isolated from sunflower seeds, inhibits matriptase with a subnanomolar Ki of 0.92 nM. On the basis of this result, we designed and synthesized its proteolytically stable analogues, SFTI-2 and SFTI-3. SFTI-3 exhibited very good binding affinity to matriptase, and it was metabolically stable.
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