CATALYTIC ACTIVITIES AND COORDINATION ENVIRONMENTS OF THE COPPER IONS IN THE IMIDAZOLE CLUSTERS OF HISTIDINE-PEPTIDES, HIS(HIS)_nGLY AND N-ACETYL-HIS(HIS)_nGLY (n = 3, 8, and 18)

Abstract

The copper ions in the imidazole-clusters of histidine-oligopeptide, His(His)_nGly(n=18) and N-acetyl-His(His)_nGly(n=8 and 18), showed the d-d transition bands at 520 nm and 630 nm and oxidase-like activities. Those with the d-d bands at 480 nm and 550 nm did not have the activity.