pheophytin-a and sodium-borohydride

pheophytin-a has been researched along with sodium-borohydride* in 1 studies

Other Studies

1 other study(ies) available for pheophytin-a and sodium-borohydride

ArticleYear
Spectral and photochemical properties of borohydride-treated D1-D2-cytochrome b-559 complex of photosystem II.
    FEBS letters, 1997, Dec-29, Volume: 420, Issue:2-3

    The D1-D2-cytochrome b-559 reaction center complex of photosystem II with an altered pigment composition was prepared from the original complex by treatment with sodium borohydride (BH4-). The absorption spectra of the modified and original complexes were compared to each other and to the spectra of purified chlorophyll a and pheophytin a (Pheo a) treated with BH4- in methanolic solution. The results of these comparisons are consistent with the presence in the modified complex of an irreversibly reduced Pheo a molecule, most likely 13(1)-deoxo-13(1)-hydroxy-Pheo a, replacing one of the two native Pheo a molecules present in the original complex. Similar to the original preparation, the modified complex was capable of a steady-state photoaccumulation of Pheo- and P680+. It is concluded that the pheophytin a molecule which undergoes borohydride reduction is not involved in the primary charge separation and seems to represent a previously postulated photochemically inactive Pheo a molecule. The Qy and Qx transitions of this molecule were determined to be located at 5 degrees C at 679.5-680 nm and 542 nm, respectively.

    Topics: Borohydrides; Chenopodiaceae; Chlorophyll; Chlorophyll A; Cytochrome b Group; Dithionite; Light; Light-Harvesting Protein Complexes; Paraquat; Pheophytins; Photosynthetic Reaction Center Complex Proteins; Photosystem II Protein Complex; Plant Proteins; Spectrophotometry

1997
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