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- W2096413727 abstract "Previously we demonstrated that Ni(II) complexes of Ac-Thr-Glu-Ser-His-His-Lys-NH2 hexapeptide, representing residues 120-125 of human histone H2A, and some of its analogs undergo E-S peptide bond hydrolysis. In this work we demonstrate a similar coordination and reactivity pattern in Ni(II) complexes of Ac-Thr-Glu-Thr-His-His-Lys-NH2, its threonine analogue, studied using potentiometry, electronic absorption spectroscopy and HPLC. For the first time we present the detailed temperature and pH dependence of such Ni(II)-dependent hydrolysis reactions. The temperature dependence of the rate of hydrolysis yielded activation energy E(a) = 92.0 kJ mol(-1) and activation entropy DeltaS# = 208 J mol(-1) K(-1). The pH profile of the reaction rate coincided with the formation of the four-nitrogen square-planar Ni(II) complex of Ac-Thr-Glu-Thr-His-His-Lys-NH2. These results expand the range of protein sequences susceptible to Ni(II) dependent cleavage by those containing threonine residues and permit predictions of the course of this reaction at various temperatures and pH values." @default.
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- W2096413727 date "2006-11-22" @default.
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- W2096413727 title "Sequence-specific Ni(II)-dependent peptide bond hydrolysis in a peptide containing threonine and histidine residues." @default.
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- W2096413727 doi "https://doi.org/10.18388/abp.2006_3299" @default.
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