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Branchu P, Canette A, Medina Fernandez S, Mounier J, Meylheuc T, Briandet R, Grimaud R, Naïtali M. Impact of temperature on Marinobacter hydrocarbonoclasticus SP17 morphology and biofilm structure during growth on alkanes. MICROBIOLOGY-SGM 2017; 163:669-677. [PMID: 28535844 DOI: 10.1099/mic.0.000466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Alkanes are widespread pollutants found in soil, freshwater and marine environments. Marinobacter hydrocarbonoclasticus (Mh) strain SP17 is a marine bacterium able to use many hydrophobic organic compounds, including alkanes, through the production of biofilms that allow their poor solubility to be overcome. This study pointed out that temperature is an environmental factor that strongly affects the biofilm formation and morphology of Mh on the model alkanes, hexadecane and paraffin. We showed that Mh biofilm formation and accumulation of intracytoplasmic inclusions are higher on solid alkanes (hexadecane at 10 °C and paraffin at 10 °C and 30 °C) than on liquid alkane (hexadecane at 30 °C) or soluble substrate (lactate at both temperatures). We also found that Mh produces more extracellular polymeric substances at 30 °C than at 10 °C on alkanes and none on lactate. We observed that bacterial length is significantly higher at 10 °C than at 30 °C on lactate and hexadecane. On paraffin, at 30 °C, the cell morphology is markedly altered by large rounded or irregularly shaped cytoplasmic inclusions. Altogether, the results showed that Mh is able to adapt and use alkanes as a carbon source, even at low temperature.
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Affiliation(s)
- Priscilla Branchu
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France.,Present address: IRSD, Université de Toulouse, INSERM, INRA, ENVT, Toulouse, France
| | - Alexis Canette
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Sara Medina Fernandez
- CNRS/Univ Pau & Pays Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR5254, 64000, Pau, France
| | - Julie Mounier
- CNRS/Univ Pau & Pays Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR5254, 64000, Pau, France
| | - Thierry Meylheuc
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Romain Briandet
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Régis Grimaud
- CNRS/Univ Pau & Pays Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR5254, 64000, Pau, France
| | - Murielle Naïtali
- Micalis Institute, AgroParisTech, INRA, Université Paris-Saclay, 78350 Jouy-en-Josas, France
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Ennouri H, d'Abzac P, Hakil F, Branchu P, Naïtali M, Lomenech AM, Oueslati R, Desbrières J, Sivadon P, Grimaud R. The extracellular matrix of the oleolytic biofilms of Marinobacter hydrocarbonoclasticus comprises cytoplasmic proteins and T2SS effectors that promote growth on hydrocarbons and lipids. Environ Microbiol 2016; 19:159-173. [PMID: 27727521 DOI: 10.1111/1462-2920.13547] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 09/12/2016] [Accepted: 09/21/2016] [Indexed: 11/28/2022]
Abstract
The assimilation of the nearly water insoluble substrates hydrocarbons and lipids by bacteria entails specific adaptations such as the formation of oleolytic biofilms. The present article reports that the extracellular matrix of an oleolytic biofilm formed by Marinobacter hydrocarbonoclasticus at n-hexadecane-water interfaces is largely composed of proteins typically cytoplasmic such as translation factors and chaperones, and a lesser amount of proteins of unknown function that are predicted extra-cytoplasmic. Matrix proteins appear to form a structured film on hydrophobic interfaces and were found mandatory for the development of biofilms on lipids, alkanes and polystyrene. Exo-proteins secreted through the type-2 secretion system (T2SS) were shown to be essential for the formation of oleolytic biofilms on both alkanes and triglycerides. The T2SS effector involved in biofilm formation on triglycerides was identified as a lipase. In the case of biofilm formation on n-hexadecane, the T2SS effector is likely involved in the mass transfer, capture or transport of alkanes. We propose that M. hydrocarbonoclasticus uses cytoplasmic proteins released by cell lysis to form a proteinaceous matrix and dedicated proteins secreted through the T2SS to act specifically in the assimilation pathways of hydrophobic substrates.
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Affiliation(s)
- Habiba Ennouri
- IPREM - Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour Bâtiment IBEAS - UFR Sciences, avenue de l'Université, BP 1155, PAU Cedex, 64013, France.,Unité d'Immunologie, Microbiologie Environnementale et Cancérogenèse (IMEC), Faculté des sciences de Bizerte, Université de Carthage, 7021 Zarzouna, Bizerte, Tunisie
| | - Paul d'Abzac
- IPREM -Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour Technopole Hélioparc, 2 avenue du Président Pierre Angot, Pau Cedex 09, 64053, France
| | - Florence Hakil
- IPREM - Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour Bâtiment IBEAS - UFR Sciences, avenue de l'Université, BP 1155, PAU Cedex, 64013, France
| | - Priscilla Branchu
- Equipe Bioadhésion, Biofilm et Hygiène des Matériaux B2HM, UMR 1319 MICALIS, INRA AgroParisTech, Massy, France
| | - Murielle Naïtali
- Equipe Bioadhésion, Biofilm et Hygiène des Matériaux B2HM, UMR 1319 MICALIS, INRA AgroParisTech, Massy, France
| | - Anne-Marie Lomenech
- Plateforme Protéome, Centre Génomique Fonctionnelle Bordeaux, Université Bordeaux Segalen, 146 Rue Léo Saignat, Bordeaux, 33076, France
| | - Ridha Oueslati
- Unité d'Immunologie, Microbiologie Environnementale et Cancérogenèse (IMEC), Faculté des sciences de Bizerte, Université de Carthage, 7021 Zarzouna, Bizerte, Tunisie
| | - Jacques Desbrières
- IPREM -Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour Technopole Hélioparc, 2 avenue du Président Pierre Angot, Pau Cedex 09, 64053, France
| | - Pierre Sivadon
- IPREM - Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour Bâtiment IBEAS - UFR Sciences, avenue de l'Université, BP 1155, PAU Cedex, 64013, France
| | - Régis Grimaud
- IPREM - Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour Bâtiment IBEAS - UFR Sciences, avenue de l'Université, BP 1155, PAU Cedex, 64013, France
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