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- W2008649176 abstract "Textilinin-1 is a Kunitz-type serine protease inhibitor from Australian brown snake venom. Its ability to potently and specifically inhibit human plasmin (Ki = 0.44 nM) makes it a potential therapeutic drug as a systemic anti-bleeding agent. The crystal structures of the human microplasmin-textilinin-1 and the trypsin-textilinin-1 complexes have been determined to 2.78 Å and 1.64 Å resolution respectively, and show that textilinin-1 binds to trypsin in a canonical mode but to microplasmin in an atypical mode with the catalytic histidine of microplasmin rotated out of the active site. The space vacated by the histidine side-chain in this complex is partially occupied by a water molecule. In the structure of microplasminogen the χ1 dihedral angle of the side-chain of the catalytic histidine is rotated by 67° from its “active” position in the catalytic triad, as exemplified by its location when microplasmin is bound to streptokinase. However, when textilinin-1 binds to microplasmin the χ1 dihedral angle of this amino acid residue changes by −157° (i.e. in the opposite rotation direction compared to microplasminogen). The unusual mode of interaction between textilinin-1 and plasmin explains textilinin-1′s selectivity for human plasmin over plasma kallikrein. This difference can be exploited in future drug design efforts." @default.
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- W2008649176 date "2013-01-15" @default.
- W2008649176 modified "2023-09-26" @default.
- W2008649176 title "The structure of Human Microplasmin in Complex with Textilinin-1, an Aprotinin-like Inhibitor from the Australian Brown Snake" @default.
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- W2008649176 doi "https://doi.org/10.1371/journal.pone.0054104" @default.
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