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We report reconstitution of photoactive yellow protein (PYP) from apoPYP and p-coumaric acid derivatives. The addition of p-coumaric acid to the apoPYP sample did not result in the recovery of PYP. In contrast, yellow products were obtained by the addition of p-coumaryl thiophenyl ester or p-coumaric anhydride to the apoPYP sample, the absorption spectra of which were indistinguishable from the...
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