Table 1. Contributions of Solvation to the Absorption Energies of Protonated Chlc₁ and Chlc₂ in FCP (in meV).

		Chlc1	Chlc2
protein	all components	–73 (≈11 nm)	–46 (≈7 nm)
	Lys136	–48 (≈7 nm)	–
	fucoxanthin307	–18 (≈3 nm)	–
	Arg31a	–	–1 (≈0 nm)
	fucoxanthin306	–	–11(≈2 nm)
bulk water		–73 (≈11 nm)	–84 (≈13 nm)
total		–147 (≈22 nm)	–130 (≈20 nm)

^aArg31 does not contribute to the decrease in the absorption energy of Chlc₂ because Arg31 is oriented away from protonated Chlc₂ in the QM/MM-optimized structure (7.7 Å, Figure 3b).