Fine Tuning of Chlorophyll Spectra by Protein-Induced Ring Deformation.

ABSTRACT: The ability to tune the light-absorption properties of chlorophylls by their protein environment is the key to the robustness and high efficiency of photosynthetic light-harvesting proteins. Unfortunately, the intricacy of the natural complexes makes it very difficult to identify and isolate specific protein-pigment interactions that underlie the spectral-tuning mechanisms. Herein we identify and demonstrate the tuning mechanism of chlorophyll spectra in type II water-soluble chlorophyll binding proteins from Brassicaceae (WSCPs). By comparing the molecular structures of two natural WSCPs we correlate a shift in the chlorophyll red absorption band with deformation of its tetrapyrrole macrocycle that is induced by changing the position of a nearby tryptophan residue. We show by a set of rec

SUBMITTER: Bednarczyk D 

PROVIDER: S-EPMC6690836 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature