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The photoactive chromophore of photoactive yellow protein (PYP) is p-coumaric acid (pCA). In the ground state, the pCA chromophore exists as a phenolate anion, which is H-bonded by protonated Glu46 (O Glu46 –O pCA =~2.6Å) and protonated Tyr42. On the other hand, the O Glu46 –O pCA H-bond was unusually short (O Glu46 –O pCA =2.47Å) in the intermediate...
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