Selective protein cleavage reagents carrying metal chelates moiety : Synthesis and application to the structural analysis of trypsin.

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In our previous work, it was found that benzamidine derivatives behave as strong binding affinity towards trypsin and trypsin-like enzymes. As an extension of the wurk, we designed compounds which contained metal chelate moiety as well as the amidine group with a view to obtaining selective modification reagents for trypsin and trypsin-like enzymes. The reagents were expected to mediate cleavage of the enzyme backbone at the region where the metal attained close contact when they were bound in the binding site of the enzyme. the three-dimensional structure of the enzyme-reagent complex. eaction peptide bond cleavage reagents for trypsin.In 1997 we synthesized 38 chelates as candidate for trypsin-specific cleavage reagent, and their binding affinity toward trypsin and trypsin-like enzymes was determinecL They were analyzed to exhibit strong binding affinity toNard these enzymes with Ki values range of 10^5 - 1O^6 Mi. During the period of the fiscal year of 1998 the medification reaction mediated by these chelates were investigated. Cleavage was observed when the enzyme was incubated with the reagent in the presence of hydrogenperoxide and ascorbate. A peptide fragment due to bond cleavage was analyzed by SDS- PAGE.It was suggested that the cleavage occurred at the region within Gly195 -A1a2O4. It was concluded that the region is close to the active site of the enzyme in its three-dimensional structure.