title: Exciton interaction in allophycocyanin.
abstract: The absorption and circular dichroism (CD) spectra of allophycocyanin II in the trimer and monomer (dissociated) forms were resolved into four and two components, respectively. The short-wavelength region of the visible spectra was approximated by a chimera of Lorentzian- and Gaussian-shaped bands having a bandwidth of ca. 65 nm. The rest of the bands have a pure Gaussian form. The characteristic 652-nm band in the absorption spectrum (656 nm in the CD spectrum) is shown to arise from exciton interaction between two fluorescent phycocyanobilin chromophores.
mesh_terms: D002942:Circular Dichroism; D010777:Photochemistry; D010798:Phycocyanin; D010860:Pigments, Biological; D011487:Protein Conformation; D013053:Spectrophotometry
chemical_list: D010860:Pigments, Biological; C002497:allophycocyanin; D010798:Phycocyanin