摘要研究了乙二钴胺(Cbi(III))与异烟肼(异烟酰肼(INH))反应的动力学和机理。确定产物的组成取决于反应物浓度之间的比例。向cobinamide中添加过量的INH可以快速形成具有两个异烟肼分子的Cbi(III)稳定复合物。如果异烟肼和cobinamide的浓度接近或cobinamide过量,则最初形成Cbi(III)与一个异烟肼分子的复合物。然后进行快速的内层电子转移,生成还原的Cbi(II)与酰肼基(RN 2 H 2(Cbi(II))分解形成还原的cobinamide和异烟肼的氧化产物:异烟酰胺,4-吡啶吡啶和异烟酸(INA)。结论是,在过量1000%的cobinamide的作用下,INH氧化的主要产物是INA。
Thermodynamic<i>trans</i>-Effects of the Nucleotide Base in the B<sub>12</sub>Coenzymes
作者:Bernhard Kräutler
DOI:10.1002/hlca.19870700506
日期:1987.8.12
from methylcob(III)inamides to cob(II)inamides and cob(I)inamides in neutral aqueous solution were used in equilibration experiments to determine the effect fo the intramolecular coordination of the nucleotide function on the Co-C bond dissociation energies of methylcob(III)alamin (4). In the equilibrium between 4, cob(I)inamide (11), cob(I)alamin (10) and methylcob(III)inamide 6 (Scheme 2), 4 and
分析了核苷酸配体对B 12辅酶中Co-C键强度的热力学影响。从methylcob甲基转移反应(III)inamides到COB(II)inamides和穗轴(我)在中性水溶液inamides在平衡实验用于确定FO对CO-C键的解离的核苷酸功能的分子内配位作用甲基钴(III)丙氨酸的能量(4)。在4的平衡下,钴(I)酰胺(11),钴(I)阿拉明(10)和甲基钴(III))inamide 6(方案2),4和11发现占主导地位的(4 + 11 ⇆ 10 + 6,平衡常数ķ I / III ≈0.004),而之间的平衡4,穗轴(II)inamide 9,穗轴(II)阿拉明(5),和6(方案1)被证明是良好的平衡(4 + 9 ⇄ 5 + 6,平衡常数ķ II / III= 0.60)。这些平衡值表明核苷酸配位稳定了4中的Co-C键,以防止均溶(轻微影响)和亲核杂合(相当大的影响)。它们通过核苷酸配位反映出完整的corrins
Kinetics of the Reaction between Cobinamide and Isoniazid in Aqueous Solutions
作者:S. O. Tumakov、I. A. Dereven’kov、D. S. Sal’nikov、S. V. Makarov
DOI:10.1134/s0036024419020274
日期:2019.2
AbstractThe kinetics and mechanism of the reaction of diaquacobinamide (Cbi(III)) with isoniazid (iso-nicotinoyl hydrazide (INH)) are studied. It is determined that the composition of the products depends on the ratio between the concentrations of the reactants. Adding excess INH to cobinamide results in the rapid formation of a stable complex of Cbi(III) with two isoniazid molecules. If the concentrations
摘要研究了乙二钴胺(Cbi(III))与异烟肼(异烟酰肼(INH))反应的动力学和机理。确定产物的组成取决于反应物浓度之间的比例。向cobinamide中添加过量的INH可以快速形成具有两个异烟肼分子的Cbi(III)稳定复合物。如果异烟肼和cobinamide的浓度接近或cobinamide过量,则最初形成Cbi(III)与一个异烟肼分子的复合物。然后进行快速的内层电子转移,生成还原的Cbi(II)与酰肼基(RN 2 H 2(Cbi(II))分解形成还原的cobinamide和异烟肼的氧化产物:异烟酰胺,4-吡啶吡啶和异烟酸(INA)。结论是,在过量1000%的cobinamide的作用下,INH氧化的主要产物是INA。