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Cyt. b-559 in Photosystem II

  • Ranjana Paliwal
  • G. S. Singhal
Part of the NATO ASI Series book series (NSSA, volume 168)

Abstract

In chloroplasts, cytochrome b-559 is known to be associated with photosystem II. Though its role is not precisely understood, cyt b-559 functions probably on both the reducing and the oxidising sides of photo-system II. A high as well as a low potential form of cyt b-559 with mid-point potentials respectively from +350 mV to +400 mV and from +50 mV to +100 mV at pH 7.8 have been reported2 A range of redox forms may be observed in the intermediate region3 The high potential cyt b-559 requires the structural integrity of the thylakoid membrane, and its disruption causes cyt b-559 to be modified to lower potential forms. A heterogenous population of the high potential cyt b-559 has been reported. Based on biphasic chemical-induced oxidation kinetics, they have suggested that the high potential cytochrome b-559 exists in the thylakoid membrane in two different environments.

Keywords

Potential Form Donor Side Redox Form DMPC Liposome Light Induce Absorbance Change 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Ranjana Paliwal
    • 1
  • G. S. Singhal
    • 1
  1. 1.School of Life SciencesJawaharlal Nehru UniversityNew DelhiIndia

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