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Molecular architecture of a light harvesting antenna core substructure in synechococcus 6301 phycobilisomes 2 new allo phycocyanin and allo phycocyanin b complexes


Journal of Biological Chemistry 258(2): 902-908
Molecular architecture of a light harvesting antenna core substructure in synechococcus 6301 phycobilisomes 2 new allo phycocyanin and allo phycocyanin b complexes
Two new allophycocyanin-containing complexes were found among the products of partial dissociation of the phycobilisomes of Synechococcus 6301 strain AN112. These complexes were purified to homogeneity and characterized with respect to composition, stability and spectroscopic properties. The structures of the complexes were (.alpha.AP.beta.AP)3.cntdot.10.5K and (.alpha.1APB.alpha.2AP.beta.3AP).cntdot.10.5K, where .alpha.AP and .beta.AP are subunits of allophycocyanin, and .alpha.APB is the subunit of allophycocyanin. The isolation of the 2 allophycocyanin-containing complexes completes the characterization of the 4 types of components in the Synechococcus 6301 phycobilisome core. Two lines of evidence indicate that each of the 4 complexes is present twice in the core: comparison of the compositions (and yields) of the complexes with that of the intact AN112 phycobilisome, and near-coincidence of the molar absorption spectrum of the phycobilisome with that generated by summing the spectra of the constituent complexes taken in appropriate molar proportions.


Accession: 005916948



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