Human mesotrypsin-S39Y complexed with bovine pancreatic trypsin inhibitor (BPTI)

Presence versus absence of hydrogen bond donor Tyr-39 influences interactions of cationic trypsin and mesotrypsin with protein protease inhibitors.

Aprotinin, Basic protease inhibitor, BPI, BPTI

IVGGYTCEENSLPYQVSLNSGYHFCGGSLISEQWVVSAAHCYKTRIQVRLGEHNIKVLEGNEQFINAAKIIRHPKYNRDT
LDNDIMLIKLSSPAVINARVSTISLPTAPPAAGTECLISGWGNTLSFGADYPDELKCLDAPVLTQAECKASYPGKITNSM
FCVGFLEGGKDSCQRDAGGPVVCNGQLQGVVSWGHGCAWKNRPGVYTKVYNYVDWIKDTIAANS

1.6M ammonium sulfate, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Human mesotrypsin, canonical inhibitor, BPTI, HYDROLASE-HYDROLASE INHIBITOR complex

IVGGYTCEENSLPYQVSLNSGSHFCGGSLISEQWVVSAAHCYKTRIQVRLGEHNIKVLEGNEQFINAAKIIRHPKYNRDT
LDNDIMLIKLSSPAVINARVSTISLPTAPPAAGTECLISGWGNTLSFGADYPDELKCLDAPVLTQAECKASYPGKITNSM
FCVGFLEGGKDSCQRDSGGPVVCNGQLQGVVSWGHGCAWKNRPGVYTKVYNYVDWIKDTIAANS