Hydrogen bond switching among flavin and amino acid side chains in the BLUF photoreceptor observed by ultrafast infrared spectroscopy.

Biophysical Journal
Cosimo BonettiJohn T M Kennis

Abstract

BLUF domains constitute a recently discovered class of photoreceptor proteins found in bacteria and eukaryotic algae. BLUF domains are blue-light sensitive through a FAD cofactor that is involved in an extensive hydrogen-bond network with nearby amino acid side chains, including a highly conserved tyrosine and glutamine. The participation of particular amino acid side chains in the ultrafast hydrogen-bond switching reaction with FAD that underlies photoactivation of BLUF domains is assessed by means of ultrafast infrared spectroscopy. Blue-light absorption by FAD results in formation of FAD(*-) and a bleach of the tyrosine ring vibrational mode on a picosecond timescale, showing that electron transfer from tyrosine to FAD constitutes the primary photochemistry. This interpretation is supported by the absence of a kinetic isotope effect on the fluorescence decay on H/D exchange. Subsequent protonation of FAD(*-) to result in FADH(*) on a picosecond timescale is evidenced by the appearance of a N-H bending mode at the FAD N5 protonation site and of a FADH(*) C=N stretch marker mode, with tyrosine as the likely proton donor. FADH(*) is reoxidized in 67 ps (180 ps in D(2)O) to result in a long-lived hydrogen-bond switched network a...Continue Reading

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