Polypeptides, excitation transfer

J. Eisinger, B. Feuer, and A. A. Lamola, Intramolecular singlet excitation transfer. Applications to polypeptides, Biochemistry 8, 3908-3915 (1969). 

I. Z. Steinberg, Long-range nonradiative transfer of electronic excitation energy in proteins and polypeptides, Ann. Rev. Biochem. 40, 83-114 (1971). 

Further energy transfer within the rods may be performed by the /3f-chromophores of the PBS rods, modulated by the various 30 kDa-linker polypeptides, and directed along the central rod channel towards the APC complexes of the PBS core. Excitation energy transfer in the PBS was found to occur in up to five steps with different energy transfer rates [134] within the discs (hexamers) from (s)- to (f)-chromophores and from (f)- to (f)-chromophores, from disc to disc, from the rods to the APC complexes in the core, to the APB-Lcm complex and to Chi a in the PS II complex. The disc-to-disc excitation energy transfer (20 ps) was supposed to be the rate-limiting step. 

Fig. 12. (A) Time-resolved fluorescence spectra of A. nidulans phycobilisomes measured at 77 K. Excitation by 6-ps, 580-nm argon laser pulse. Three small ticks in the topmost spectrum (at 932 ps) indicate locations of maximum fluorescence at 0 ps. (B) Rise and decay of various fluorescent components derived from deconvolution of the fluorescence spectra. Assignment of individual fluorescent components are shown in the right margin. (C) Energy flow among individual chromophores in the phycobilisomes. The asterisk in (B) and (C) indicates a linker polypeptide is attached to the trimer. See text for discussion. Figure source Mimuro (1989) Studies on excitation energy How in the photosynthetic pigment system structure and energy transfer mechanisms. Bot Mag Tokyo 103 244.

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