Abstract
AbstractThe effect of poly(4‐vinyl pyridine) quaternized with ethyl bromide (C2PVP) on the cleavage of threonine catalyzed by pyridoxal (PL) of pyridoxal phosphate (PLP) with metal ion was investigated. When PLP was used with Cu2+, Al3+, Fe3+, or VO2+C2+PVP showed marked stimulation, whereas the stimulation was small when PL was used with each of these metal ions. The stimulation by C2PVP was reduced in the presence of 0.1M KCI. To account for this stimulation we suggested the contribution of the electrostatic interaction between C2PVP and phosphate moiety of PLP. The introduction of hydrophobicity into the polymer by quaternizing partially with dodecyl bromide did not improve the stimulation. With Co2+ or Zn2+, or without multivalent cation, a similar effect of C2PVP on the catalysis of threonine cleavage by PLP was shown, although the reaction rate was low, but with Ni2+ C2PVP did not affect the reaction catalyzed by PL or PLP.
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