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12.
  • Sundqvist, Christer, et al. (författare)
  • Spectral properties and chromophore rotation of phytochrome bound to substituted Sepharose
  • 1986
  • Ingår i: Physiologia Plantarum. - : Wiley. - 0031-9317 .- 1399-3054. ; 66, s. 185-190
  • Tidskriftsartikel (refereegranskat)abstract
    • Brushite purified phytochrome from Avena sativa L. cv. Sol II was bound to phenyl Sepharose, octyl Sepharose, CNBr-activated Sepharose and to anti-phytochrome immunoglobulins immobilized on Sepharose. The spectral properties of phytochrome bound to anti-phytochrome immunoglobulins and to phenyl Sepharose were similar to phytochrome in solution. Phytochrome bound to CNBr-activated Sepharose or to octyl Sepharose showed reduced Pfr formation after red irradiation. The reversal to Pr with far-red light was only partial but a further increase at 667 nm took place slowly in the dark. A peak at 657 nm was seen in the difference spectrum between CNBr-activated Sepharose-bound phytochrome kept in darkness and the identical sample immediately after a far-red irradiation. The change in linear dichroism at 660 nm and 730 nm, induced by plane polarized red or far-red light, was measured. It was computed that the long-wavelength transition moment of phytochrome had an average rotation angle of 31.5° or 180°–31.5°. The substrate used for immobilization had a limited effect on the rotation angle. Phytochrome immobilized on CNBr-activated Sepharose gave an angle of 27.8° and phytochrome immobilized on phenyl Sepharose gave an angle of 32.6°.
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