Catalysis by polymer complexes. I. Enhanced esterolytic reactivity of hydroxamate–polymer complexes

Toyoki Kunitake, Seiji Shinkai, Sumio Hirotsu

研究成果: Contribution to journalArticle査読

27 被引用数 (Scopus)

抄録

N‐methylmyristohydroxamic acid (1) bound to polymer micelles of laurylated poly(2‐ and 4‐vinylpyridines) (lauryl group contet: 2VP‐L, 30 mol%; 4VP‐L, 33 mol%) quantitatively reacted with p‐nitrophenyl acetate (NpAc) within a few seconds at 30°C, pH 8.95. Second order rate constants ka were 34,000 M−1 sec−1 for 1–2VP‐L and 11,400 M−1 sec−1 for 1–4VP‐L at μ = 0.5, and they were pronouncedly improved by a decrease in ionic strength (ka = 27,500–80,200 M−1 sec−1 at μ = 0.08). In contrast, poly(N‐ethyl‐4‐vinylpyridinium bromide) hardly affected the nucleophilicity of the hydroxamate ion. Therefore, the enhancement was considered to be associated with some micellar characteristics. Typical saturation phenomena of the reaction rate were observed for p‐nitrophenyl hexanoate (NpOCOPe) and 3‐nitro‐4‐acetoxybenzoic acid (NpAcCOOH). It was suggested that binding of NpOCOPe is caused by the hydrophobic interaction, while that of NpAcCOOH is probably induced by the electrostatic interaction. It is demonstrated that the cationic polymer micelle enormously activates the bound hydroxamate anion, and these complexes would be of much interest as a biomimetic system for enzyme catalysis.

本文言語英語
ページ(範囲)1143-1153
ページ数11
ジャーナルBiopolymers
15
6
DOI
出版ステータス出版済み - 6 1976

All Science Journal Classification (ASJC) codes

  • 生物理学
  • 生化学
  • 生体材料
  • 有機化学

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