Journal
NATURE STRUCTURAL BIOLOGY
Volume 10, Issue 6, Pages 491-492Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsb929
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The reaction catalyzed by the light-driven enzyme protochlorophyllide oxidoreductase (POR) has been initiated with a 50-fs laser pulse. We show that the catalytic mechanism, involving proton and hydride transfers, proceeds with time constants of 3 ps and 400 ps. It is known that catalysis by POR involves thermally excited protein dynamics; our results show that these molecular motions occur on an ultrafast timescale.
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