Phycobilisome composition and possible relationship to reaction centers

Archives of Biochemistry and Biophysics
R KhannaE Gantt

Abstract

The photosynthetic apparatus was studied in Anacystis nidulans wild type and in a spontaneous pigment mutant 85Y which had improved growth in far-red light (greater than 650 nm). Two phycobiliproteins, C-phycocyanin (lambda max 625) and allophycocyanin (lambda max 650), were present in a molar ratio of approximately 3:1 in the wild type and approximately 0.4:1 in the mutant. Phycobilisomes of wild type cells were larger (57 X 30 nm) than those of the mutant 85Y (28 X 15 nm). In the mutant they seemed to consist primarily of the allophycocyanin core. Fluorescence emission maxima of wild type and mutant 85Y phycobilisomes were at 680 nm (23 degrees C) and 685 nm (-196 degrees C). Excitation maxima of phycobilisomes were at 630 and 650 nm for the wild type and the mutant 85Y, respectively. The phycobilisomes of wild type cells whether grown in white or far-red light had the same size and pigment composition. A typical wild type cell in white light had a thylakoid area of 22.8 microns 2, but in far-red light the area was reduced to 13.5 microns 2, which was close to that of 85Y at 13.6 microns 2. Chlorophyll molecules per cell decreased in far-red light from 1.1 X 10(7) in wild type (white light) to 4.5 X 10(6) in mutant 85Y (far-r...Continue Reading

References

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Citations

Jan 1, 1986·Photosynthesis Research·B A Zilinskas, L S Greenwald
Apr 1, 1989·Photosynthesis Research·J Biggins, D Bruce
Sep 1, 1986·Plant Physiology·A Manodori, A Melis
Mar 1, 1992·Plant Physiology·R M de LorimierS E Stevens
Apr 4, 2017·Photosynthesis Research·Dmitry V ZlenkoIgor N Stadnichuk

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