Ultrafast Infrared Spectroscopy of an Isotope-Labeled Photoactivatable Flavoprotein

Allison Haigney, Andras Lukacs, Rui-Kun Zhao, Allison L. Stelling, Richard Brust, Ryu-Ryun Kim, Minako Kondo, Ian Clark, Michael Towrie, Gregory M. Greetham, Boris Illarionov, Adelbert Bacher, Werner Römisch-Margl, Markus Fischer, Steve Meech, Peter J. Tonge

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The blue light using flavin (BLUF) domain photosensors, such as the transcriptional antirepressor AppA, utilize a noncovalently bound flavin as the chromophore for photoreception. Since the isoalloxazine ring of the chromophore is unable to undergo large-scale structural change upon light absorption, there is intense interest in understanding how the BLUF protein matrix senses and responds to flavin photoexcitation. Light absorption is proposed to result in alterations in the hydrogen-bonding network that surrounds the flavin chromophore on an ultrafast time scale, and the structural changes caused by photoexcitation are being probed by vibrational spectroscopy. Here we report ultrafast time-resolved infrared spectra of the AppA BLUF domain (AppABLUF) reconstituted with isotopically labeled riboflavin (Rf) and flavin adenine dinucleotide (FAD), which permit the first unambiguous assignment of ground and excited state modes arising directly from the flavin carbonyl groups. Studies of model compounds and DFT calculations of the ground state vibrational spectra reveal the sensitivity of these modes to their environment, indicating that they can be used as probes of structural dynamics.
Original languageEnglish
Pages (from-to)1321-1328
Number of pages8
JournalBiochemistry
Volume50
Issue number8
DOIs
Publication statusPublished - 10 Jan 2011

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