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Title: Outer membrane vesicles from cold-adapted antarctic bacteria
Author: Pérez-Cruz, Carla
Mercadé Gil, M. Elena
Keywords: Bacteris
Resistència al fred
Cold adaptation
Issue Date: 2014
Publisher: Research Signpost
Abstract: Many Gram-negative, cold-adapted bacteria from the Antarctic environment produce large amounts of extracellular matter with potential biotechnological applications. Transmission electron microscopy (TEM) analysis after high-pressure freezing and freeze substitution (HPF-FS) showed that this extracellular matter is structurally complex, appearing around cells as a netlike mesh, and composed of an exopolymeric substance (EPS) containing large numbers of outer membrane vesicles (OMVs). Isolation, purification and protein profiling via 1D SDS-PAGE confirmed the outer membrane origin of these Antarctic bacteria OMVs. In an initial attempt to elucidate the role of OMVs in cold-adapted strains of Gram-negative bacteria, a proteomic analysis demonstrated that they were highly enriched in outer membrane proteins and periplasmic proteins associated with nutrient processing and transport, suggesting that the OMVs may be involved in nutrient sensing and bacterial survival. OMVs from Gram-negative bacteria are known to play a role in lateral DNA transfer, but the presence of DNA in these vesicles has remained difficult to explain. A structural study of Shewanella vesiculosa M7T using TEM and Cryo-TEM revealed that this Antarctic Gram-negative bacterium naturally releases conventional one-bilayer OMVs, together with a more complex type of OMV, previously undescribed, which on formation drags along inner membrane and cytoplasmic content and can therefore also entrap DNA.
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It is part of: Recent Advances in Pharmaceutical Sciences IV, 2014, Research Signpost : Editors: Diego Muñoz Torrero, Manuel Vázquez-Carrera & Joan Estelrich i Latràs. ISBN: 978-81-308-0554-2. Chapter 4, p. 55-72.
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Appears in Collections:Llibres / Capítols de llibre (Biologia, Sanitat i Medi Ambient)

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