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2006 | 53 | 4 | 721-727
Article title

Sequence-specific Ni(II)-dependent peptide bond hydrolysis in a peptide containing threonine and histidine residues

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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 Ea = 92.0 kJ mol-1 and activation entropy ΔS≠ = 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.
Physical description
  • Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, USA
  • University of Ioannina, Department of Chemistry, Ioannina, Greece
  • Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland
  • Central Institute of Labour Protection-National Research Institute, Warszawa, Poland
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