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Abstract. Photoactive yellow protein (PYP) is a prototype of the PAS domain superfamily of signaling proteins. The signaling process is coupled to a three-state photocycle. After the photoinduced trans-cis isomerization of the chromophore, 4-hydroxycinnamic acid (pCA), an early intermediate (pR) is formed, which proceeds to a second intermediate state (pB) on a sub-millisecond time scale. The signaling...
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