Membrane invagination in Rhodobacter sphaeroides is initiated at curved regions of the cytoplasmic membrane, then forms both budded and fully detached spherical vesicles

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Tucker, Jaimey D. and Siebert, C. Alistair and Escalante, Maryana and Adams, Peter G. and Olsen, John D. and Otto, Cees and Stokes, David L. and Hunter, C. Neil (2010) Membrane invagination in Rhodobacter sphaeroides is initiated at curved regions of the cytoplasmic membrane, then forms both budded and fully detached spherical vesicles. Molecular Microbiology, 76 (4). 833 - 847. ISSN 0950-382X

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Abstract:The purple phototrophic bacteria synthesize an extensive system of intracytoplasmic membranes (ICM) in order to increase the surface area for absorbing and utilizing solar energy. Rhodobacter sphaeroides cells contain curved membrane invaginations. In order to study the biogenesis of ICM in this bacterium mature (ICM) and precursor (upper pigmented band – UPB) membranes were purified and compared at the single membrane level using electron, atomic force and fluorescence microscopy, revealing fundamental differences in their morphology, protein organization and function. Cryo-electron tomography demonstrates the complexity of the ICM of Rba. sphaeroides. Some ICM vesicles have no connection with other structures, others are found nearer to the cytoplasmic membrane (CM), often forming interconnected structures that retain a connection to the CM, and possibly having access to the periplasmic space. Near-spherical single invaginations are also observed, still attached to the CM by a ‘neck’. Small indents of the CM are also seen, which are proposed to give rise to the UPB precursor membranes upon cell disruption. ‘Free-living’ ICM vesicles, which possess all the machinery for converting light energy into ATP, can be regarded as bacterial membrane organelles.
Item Type:Article
Copyright:© 2010 Wiley
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/76538
Official URL:http://dx.doi.org/10.1111/j.1365-2958.2010.07153.x
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