Journal of Microbiology

Journal Articles

Novosphingobium sp. PP1Y as a novel source of outer membrane vesicles: Federica De Lise , Francesca Mensitieri , Giulia Rusciano , Fabrizio Dal Piaz , Giovanni Forte , Flaviana Di Lorenzo , Antonio Molinaro , Armando Zarrelli , Valeria Romanucci , Valeria Cafaro , Antonio Sasso , Amelia Filippelli , Alberto Di Donato , Viviana Izzo; J. Microbiol. 2019;57(6):498-508. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8483-2

Abstract: Outer membrane vesicles (OMVs) are nanostructures of 20– 200 nm diameter deriving from the surface of several Gramnegative bacteria. OMVs are emerging as shuttles involved in several mechanisms of communication and environmental adaptation. In this work, OMVs were isolated and characterized from Novosphingobium sp. PP1Y, a Gram-negative non-pathogenic microorganism lacking LPS on the outer membrane surface and whose genome was sequenced and annotated. Scanning electron microscopy performed on samples obtained from a culture in minimal medium highlighted the presence of PP1Y cells embedded in an extracellular matrix rich in vesicular structures. OMVs were collected from the exhausted growth medium during the mid-exponential phase, and purified by ultracentrifugation on a sucrose gradient. Atomic force microscopy, dynamic light scattering and nanoparticle tracking analysis showed that purified PP1Y OMVs had a spherical morphology with a diameter of ca. 150 nm and were homogenous in size and shape. Moreover, proteomic and fatty acid analysis of purified OMVs revealed a specific biochemical “fingerprint”, suggesting interesting details concerning their biogenesis and physiological role. Moreover, these extracellular nanostructures do not appear to be cytotoxic on HaCaT cell line, thus paving the way to their future use as novel drug delivery systems.

Proteomic characterization of the outer membrane vesicle of the halophilic marine bacterium Novosphingobium pentaromativorans US6-1: Sung Ho Yun , Sang-Yeop Lee , Chi-Won Choi , Hayoung Lee , Hyun-Joo Ro , Sangmi Jun , Yong Min Kwon , Kae Kyoung Kwon , Sang-Jin Kim , Gun-Hwa Kim , Seung Il Kim; J. Microbiol. 2017;55(1):56-62. Published online December 30, 2016; DOI: https://doi.org/10.1007/s12275-017-6581-6

Abstract: Novosphingobium pentaromativorans US6-1 is a Gram-negative halophilic marine bacterium able to utilize several polycyclic aromatic hydrocarbons such as phenanthrene, pyrene, and benzo[a]pyrene. In this study, using transmission electron microscopy, we confirmed that N. pentaromativorans US6-1 produces outer membrane vesicles (OMVs). N. pentaromativorans OMVs (hereafter OMVNovo) are spherical in shape, and the average diameter of OMVNovo is 25–70 nm. Proteomic analysis revealed that outer membrane proteins and periplasmic proteins of N. pentaromativorans are the major protein components of OMVNovo. Comparative proteomic analysis with the membrane-associated protein fraction and correlation analysis demonstrated that the outer membrane proteins of OMVNovo originated from the membrane- associated protein fraction. To the best of our knowledge, this study is the first to characterize OMV purified from halophilic marine bacteria.

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