WikiJournal Preprints/Sunflower Trypsin Inhibitor

Introduction
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Enzymatic Activity
SFTI-1 is the smallest member of the Bowman-Birk family of serine protease inhibitors. With only 14 amino acid residues, it is much smaller than any other Bowman-Birk inhibitor. It has only one active site, whereas most Bowman-Birk inhibitors have two. Despite its name SFTI-1 can inhibit a range of serine proteases, not just trypsin.

Evolution and Distribution
SFTI-1 and two other PDPs are protease inhibitors. The function of other PDPs is unknown, thought it si speculated that they may have defensive properties.

Acknowledgements
M.F. was supported by the Australian Government’s Research Training Program and a Bruce and Betty Green Postgraduate Research Scholarship.

Competing interests
The authors have no competing interests.

Ethics statement
Not applicable.