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pubmed-article:20533322pubmed:dateCreated2010-6-10lld:pubmed
pubmed-article:20533322pubmed:abstractTextThe direct detection of intermediates in enzymatic reactions can yield important mechanistic insights but may be difficult due to short intermediate lifetimes and chemical instability. Using a rapid-mixing device coupled with electrospray ionization time-of-flight mass spectrometry, the noncovalent hemiketal intermediate in the reaction of metal-dependent 3-deoxy-D-manno-octulosonate-8-phosphate (KDO8P) synthase from Aquifex pyrophilus was observed in the millisecond time range. Using single turnover conditions, the noncovalent complexes of enzyme with Cd(2+):phosphoenolpyruvate, Cd(2+):phosphate, Cd(2+):KDO8P, and Cd(2+):intermediate complexes were resolved. The intermediate complex is present during times ranging from 50-630 ms, indicating that the intermediate builds up at the ambient temperatures of the experiment. This represents the first direct detection of the intermediate with a native metal-dependent KDO8PS, and further demonstrates that time-resolved mass spectrometry is a useful tool in mechanistic studies of enzymatic reactions.lld:pubmed
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pubmed-article:20533322pubmed:authorpubmed-author:AndersonKaren...lld:pubmed
pubmed-article:20533322pubmed:authorpubmed-author:FurduiCristin...lld:pubmed
pubmed-article:20533322pubmed:authorpubmed-author:RobertsAnneAlld:pubmed
pubmed-article:20533322pubmed:copyrightInfoCopyright 2010 John Wiley & Sons, Ltd.lld:pubmed
pubmed-article:20533322pubmed:issnTypeElectroniclld:pubmed
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pubmed-article:20533322pubmed:volume24lld:pubmed
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pubmed-article:20533322pubmed:authorsCompleteYlld:pubmed
pubmed-article:20533322pubmed:pagination1919-24lld:pubmed
pubmed-article:20533322pubmed:dateRevised2010-10-1lld:pubmed
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pubmed-article:20533322pubmed:year2010lld:pubmed
pubmed-article:20533322pubmed:articleTitleObservation of a chemically labile, noncovalent enzyme intermediate in the reaction of metal-dependent Aquifex pyrophilus KDO8PS by time-resolved mass spectrometry.lld:pubmed
pubmed-article:20533322pubmed:affiliationDepartment of Pharmacology, Yale University School of Medicine, New Haven, CT 06510, USA.lld:pubmed
pubmed-article:20533322pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20533322pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed