某些维生素K的氧化还原电位：对专性厌氧菌亚硫酸盐还原作用的意义。
Redox potentials of certain vitamins K: implications for a role in sulfite reduction by obligately anaerobic bacteria.
作者信息
Wagner G C, Kassner R J, Kamen M D
出版信息
Proc Natl Acad Sci U S A. 1974 Feb;71(2):253-6. doi: 10.1073/pnas.71.2.253.
Abstract
Redox potentials of a menaquinone (MK-6), isolated in earlier researches from two species of the obligately anaerobic genus, Desulfovibrio, as well as two other vitamins K(2)-menaquinones (MK-5) and (MK-9)- have been determined polarographically. The measurements have been validated by determination of redox potentials of 1,4-naphthoquinone and vitamin K(1) which agree with published potentiometric values. E(m7) for menaquinone (MK-6) is -0.067 +/- 0.010 V. Redox potentials calculated for terminal acceptor couples currently proposed in the mechanisms of sulfate reduction by Desulfovibrio are consistent with the involvement of menaquinone (MK-6) in at least one of the steps postulated during electron transfer with ultimate production of sulfide.
摘要
在早期研究中，从专性厌氧的脱硫弧菌属的两个物种中分离出的甲萘醌（MK-6）以及另外两种维生素K2-甲萘醌（MK-5）和（MK-9）的氧化还原电位已通过极谱法测定。通过测定1,4-萘醌和维生素K1的氧化还原电位对测量结果进行了验证，其结果与已发表的电位测定值一致。甲萘醌（MK-6）的E(m7)为-0.067±0.010V。目前在脱硫弧菌硫酸盐还原机制中提出的末端受体对的计算氧化还原电位与甲萘醌（MK-6）参与电子转移最终产生硫化物过程中假设的至少一个步骤一致。
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