CU(II) BINDING BY ANGIOTENSIN-II FRAGMENTS - ASP-ARG-VAL-TYR-ILE-HIS AND ARG-VAL-TYR-ILE-HIS - COMPETITION BETWEEN AMINO GROUP AND IMIDAZOLE NITROGENS IN ANCHORING OF METAL-IONS

被引:29
作者
BAL, W
JEZOWSKABOJCZUK, M
KOZLOWSKI, H
CHRUSCINSKI, L
KUPRYSZEWSKI, G
WITCZUK, B
机构
[1] WROCLAW B BEIRUT UNIV,INST CHEM,PL-50383 WROCLAW,POLAND
[2] TECH UNIV LODZ,FAC PROC & ENVIRONM ENGN,PL-90924 LODZ,POLAND
[3] UNIV GDANSK,FAC CHEM,PL-80952 GDANSK,POLAND
关键词
D O I
10.1016/0162-0134(94)00026-7
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Potentiometric and spectroscopic (absorption, circular dichroism and electron paramagnetic resonance) study on the coordination of two angiotensin II fragments (Asp-Arg-Val-Tyr-Ile-His and Arg-Val-Tyr-Ile-His) to Cu(II) ions has shown that competition between amino and imidazole nitrogens to anchor metal ions is a complicated process and may lead to formation of macrochelate rings. The important factor that influences this competition is the distance between competing His and N-terminal residues (number of spacer residues in a peptide sequence).
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页码:235 / 247
页数:13
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