A peptide template as an allosteric supramolecular catalyst for the cleavage of phosphate esters

被引:71
作者
Scarso, A
Scheffer, U
Göbel, M
Broxterman, QB
Kaptein, B
Formaggio, F
Toniolo, C
Scrimin, P [1 ]
机构
[1] Univ Padua, Dept Organ Chem, I-35131 Padua, Italy
[2] CNR, Ctr Studio Biopolimeri, I-35131 Padua, Italy
[3] CNR, Ctr Meccanismi Reaz Organ, I-35131 Padua, Italy
[4] Goethe Univ Frankfurt, Dept Chem, D-60439 Frankfurt, Germany
[5] DSM Res & Patents, Div Fine Chem Adv Synth & Catalysis, NL-6160 MD Geleen, Netherlands
关键词
D O I
10.1073/pnas.072642699
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The heptapeptide H-Iva-Api-Iva-ATANP-Iva-Api-Iva-NHCH3 (P1a), where Iva is (S)-isovaline, Api is 4-amino-4-carboxypiperidine, and ATANP is (S)-2-amino-3-[1-(1,4,7-triazacyclononane)]propanoic acid, has been synthesized. Its conformation in aqueous solution is essentially that of a 3(10)-helix. By connecting three copies of P1a to a functionalized Tris(2-aminoethyl)amine (Tren) platform a new peptide template, [T(P1)(3)], was obtained. This molecule is able to bind up to four metal ions (Cu-II or Zn-II): one in the Tren subsite and three in the azacyclononane subunits. The binding of the metals to the Tren platform induces a change from an open to a closed conformation in which the three short, helical peptides are aligned in a parallel manner with the azacyclonane units pointing inward within the pseudocavity they define. T(P1)(3) shows a peculiar behavior in the transphosphorylation of phosphate esters; the tetrazinc complex is a catalyst of the cleavage of 2-hydroxypropyl-p-nitrophenyl phosphate (HPNP), whereas the free ligand is a catalyst of the cleavage of an oligomeric RNA sequence with selectivity for pyrimidine bases. in the case of HPNP, Zn-II acts as a positive allosteric effector by enhancing the catalytic efficiency of the system. In the case of the polyanionic RNA substrate, Zn-II switches off the activity, thus behaving as a negative allosteric regulator. It is suggested that the opposite behavior of the catalyst induced by Zn-II is associated with the change of conformation of the Tren platform, and consequently of the relative spatial disposition of the three linked peptides, that occurs after binding of the metal ion.
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页码:5144 / 5149
页数:6
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