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. 2015 Nov 3;2:62. doi: 10.3389/fmolb.2015.00062

Figure 1.

Figure 1

BLUF photoreceptors. Upon illumination of the BLUF domain (receptor) structural changes are transmitted to its cognate effector domain and induce an increased activity (A). These structural changes thermally relax into the resting state. The UV/vis spectrum of BLUF domains shifts by about 10–15 nm to red upon illumination (B). In the signaling-minus-resting state FTIR difference spectrum a characteristic downshift of the C4 = O carbonyl signature is observed (C). Structural model of the AppA BLUF domain and topology map (D, PDB ID 1YRX). Isoalloxazine moiety of flavin cofactors (E).