Unusual ligand binding at the active site domain of an engineered mutant of subtilisin BL.

Abstract excerpt

As an attempt to recruit the third calcium binding site of thermitase into subtilisin BL, a Bacillus lentus alkaline protease (BLAP), the amino acid sequence from position 50 to 60 and position 92 was modified to the equivalent amino acids in thermitase. The resulting protein, designated BLAPm109, exhibited unusual biochemical features. Peptide mapping and gel electrophoresis revealed that two protein species...

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