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• W2000790632 endingPage "501" @default.
• W2000790632 startingPage "496" @default.
• W2000790632 abstract "The previously synthesized, terminally blocked heptapeptide Ac-Aib-ATANP-Aib-Aib-ATANP-Aib-Aib-OMe (1a), where ATANP is (S)-2-amino-3-[1-(1,4,7-triazacyclononane)]propanoic acid and Aib is alpha-aminoisobutyric acid, which is soluble in neutral water where it largely adopts a 3(10)-helical conformation, has been studied, as bimetallic complex [metal ions: Cu(II), Ni(II), Zn(II)], for the transphosphorylation catalysis of the RNA-model substrate 2-(hydroxypropyl)-p-nitrophenyl phosphate (HPNP). A detailed analysis was carried out with the Zn(II) dinuclear complex. Comparison with the mononuclear Zn(II) complex with 1,4,7-triazacyclononane (3) points to cooperativity between the two Zn(II) ions in the process catalyzed by 1a-2Zn(II). On the contrary, the dinuclear Zn(II) complex of dipeptide Ac-(ATANP)(2)-OMe (2), lacking any ordered conformation, is less active than 3-Zn(II). The kinetic analysis suggests the following: (a) the peptide is conformationally very robust and does not loose activity up to 50 degrees C; (b) the substrate binds to the peptide-Zn(II) complex, although not all modes of complexation allow us to take advantage of the cooperativity between the two metal centers. The maximum rate acceleration estimated at pH 7 for the fully bound substrate is ca. 200-fold compared with the uncatalyzed process." @default.
• W2000790632 created "2016-06-24" @default.
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• W2000790632 date "2000-01-01" @default.
• W2000790632 modified "2023-10-16" @default.
• W2000790632 title "An azacrown-functionalized peptide as a metal ion based catalyst for the cleavage of a RNA-model substrate" @default.
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• W2000790632 doi "https://doi.org/10.1002/1097-0282(2000)55:6<496::aid-bip1025>3.0.co;2-6" @default.
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