文章基本信息

标题：Direct measurement of proton release by cytochrome c oxidase in solution during the F→O transition
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作者：Dmitry Zaslavsky ; Robert C. Sadoski ; Sany Rajagukguk 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2004
卷号：101
期号：29
页码：10544-10547
DOI：10.1073/pnas.0401521101
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The mechanism by which electron transfer is coupled to proton pumping in cytochrome c oxidase is a major unsolved problem in molecular bioenergetics. In this work it is shown that, at least under some conditions, proton release from the enzyme occurs before proton uptake upon electron transfer to the heme/Cu active site of the enzyme. This sequence is similar to that of proton release and uptake observed for the light-activated proton pump bacteriorhodopsin. In the case of cytochrome c oxidase, this observation means that both the ejected proton and the proton required for the chemistry at the enzyme active site must come from an internal proton pool.