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Stacking of Purple Membranes in Vitro

  • Marcelle Lefort-Tran
  • Monique Pouphile
  • Bernard Arrio
  • Georges Johannin
  • Pierre Volfin
  • Lester Packer

Abstract

Negative staining electron microscopy showed that purple membranes isolated from Halobacterium halobium are aggregated in vitro in the form of stacked arrays. This effect is more marked after trypsin treatment. White membranes isolated from mutant strains do not stack and exhibit an average size consistent with previous results of electron microscopy. White membrane fragments also do not exhibit stacking in vitro after retinal reconstitution or trypsin treatment. Quasi-elastic light scattering was also used to characterize the size (hydrodynamic radius) of isolated purple and white membranes before and after proteolysis. These results also show that native purple membrane preparations are larger in size than expected and that, following trypsin treatment, they are on average more than an order of magnitude larger. In stacked purple preparations, cations are unable to exchange freely with the aqueous medium. This explains why proteolysis lowers the efficiency of proton release by illuminated bacteriorhodopsin in purple membranes in vitro. Thus, previously reported decreases in efficiency of proton release by bacteriorhodopsin in proteolyzed purple membranes are due to the stacking effect and not per se to loss of the carboxyl terminus tail.

Keywords

Hydrodynamic Radius Trypsin Treatment Purple Membrane Membrane Sheet Proton Release 
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 1986

Authors and Affiliations

  • Marcelle Lefort-Tran
    • 1
  • Monique Pouphile
    • 1
  • Bernard Arrio
    • 2
  • Georges Johannin
    • 2
  • Pierre Volfin
    • 2
  • Lester Packer
    • 3
  1. 1.Laboratoire de Cytophysiologie de la PhotosyntheseGif Sur YvetteFrance
  2. 2.Institut de Biochimie, Bat 432Universite de Paris XIOrsayFrance
  3. 3.Membrane Bioenergetics Group Applied Science Division, Lawrence Berkeley LaboratoryUniversity of CaliforniaBerkeleyUSA

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