Human alpha- and beta-tryptases are trypsin-like serine proteinases, that are synthesized in large amounts in mast cells. It has been shown that beta-tryptase is enzymatically active, whereas alpha-tryptase has little, if any, enzymatic activity. In this work, the crystal structures of two enzymatically active alpha-I tryptase mutants (D216G, K192Q/D216G) were solved and analyzed in complex with leupeptin as well as the crystal structure of the single mutant D216G without inhibitor. In the second part of this work, human Securin was analyzed biochemically. The inhibitor securin plays an important role in chromosome segregation by regulating the cysteine proteinase separase. Human securin was expressed recombinantly in E. coli and analyzed biochemically in terms of secondary structure.
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Human alpha- and beta-tryptases are trypsin-like serine proteinases, that are synthesized in large amounts in mast cells. It has been shown that beta-tryptase is enzymatically active, whereas alpha-tryptase has little, if any, enzymatic activity. In this work, the crystal structures of two enzymatically active alpha-I tryptase mutants (D216G, K192Q/D216G) were solved and analyzed in complex with leupeptin as well as the crystal structure of the single mutant D216G without inhibitor. In the secon...
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