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Three Microbial Musketeers of the Seas: Shewanella baltica, Aliivibrio fischeri and Vibrio harveyi, and their adaptation to different salinity probed by a proteomic approach

ABSTRACT: Osmotic changes are common challenges for marine microorganisms. Bacteria developed numerous ways of dealing with this stress, including reprogramming of global cellular processes, however, many molecular details were obtained only for the model bacteria. In this work we asked what is the basis of the adjustment to prolonged salinity challenges at the proteome level. The objects of our studies were three representatives of bacteria inhabiting various marine environments, Shewanella baltica, Vibrio harveyi and Aliivibrio fischeri. The proteomic studies were performed with bacteria cultivated in increased and decreased salinity, followed by proteolytic digestion of samples which were then subjected to liquid chromatography with tandem mass spectrometry analysis. We show that bacteria adjust at all levels of their biological processes, from DNA topology through gene expression regulation and proteasome assembly, to transport and cellular metabolism. Finding that many similar adaptation strategies were observed for both, low and high salinity conditions, is particularly interesting. The results show that adaptation to salinity challenge involves accumulation of DNA-binding proteins and increased polyamine uptake, and we hypothesize that their function is to coat and protect the nucleoid to counteract adverse changes in the DNA topology due to ionic shifts.

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ORGANISM(S): Aliivibrio Fischeri Shewanella Baltica Vibrio Harveyi

SUBMITTER: Paulina Czaplewska

LAB HEAD: Paulina Czaplewska

PROVIDER: PXD029628 | Pride | 2022-02-17

REPOSITORIES: Pride

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Three Microbial Musketeers of the Seas: Shewanella baltica, Aliivibrio fischeri and Vibrio harveyi, and Their Adaptation to Different Salinity Probed by a Proteomic Approach.

Kloska Anna A Cech Grzegorz M GM Nowicki Dariusz D Maciąg-Dorszyńska Monika M Bogucka Aleksandra E AE Markert Stephanie S Becher Dörte D Potrykus Katarzyna K Czaplewska Paulina P Szalewska-Pałasz Agnieszka A

International journal of molecular sciences 20220106 2

Osmotic changes are common challenges for marine microorganisms. Bacteria have developed numerous ways of dealing with this stress, including reprogramming of global cellular processes. However, specific molecular adaptation mechanisms to osmotic stress have mainly been investigated in terrestrial model bacteria. In this work, we aimed to elucidate the basis of adjustment to prolonged salinity challenges at the proteome level in marine bacteria. The objects of our studies were three representati ...[more]

PMID: 35054801

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Project description:Deficiency in the protein-tyrosine phosphatase SHP1/PTPN6 is linked with hematological malignancies and chronic inflammatory diseases. Here we exploited the embryonic and larval stages of zebrafish as an animal model to study ptpn6 function in the sole context of innate immunity. We show that ptpn6 knockdown induces a spontaneous inflammation-associated phenotype at the late larval stage, which was microbe-independent and enhanced instead of suppressed by glucocorticoids. When challenged with Salmonella typhimurium or Mycobacterium marinum at earlier stages of development, the innate immune system was hyperactivated to a contra-productive level that impaired the control of these pathogenic bacteria. These results demonstrate the crucial regulatory function of ptpn6 in preventing host-detrimental effects of inflammation by imposing a tight control over the level of innate immune response activation. This microarray study was designed to determine the effect of morpholino knockdown of the ptpn6 gene on the innate immune response of zebrafish embryos during infection with Salmonella typhimurium. Three independent infection experiments were performed using mixed egg clutches of wild type zebrafish, which were a cross of the AB and TL strains. Each experiment consisted of the following four treatment groups: (1) uninfected control embryos, (2) S. typhimurium-infected control embryos, (3) uninfected ptpn6 knockdown embryos, and (4) S. typhimurium-infected ptpn6 knockdown embryos. Knockdown of ptpn6 was performed by micro-injecting embryos at the 1-2 cell stage with the ptpn6 morpholino, and control embryos were mock-injected with buffer. Embryos were grown at 28.5M-bM-^@M-^S30M-BM-0C in egg water and manually dechorionated at 24 hours post fertilization (hpf). Subsequently, embryos were infected at 28 hpf by micro-injecting 200-250 colony forming units (CFU) of S. typhimurium SL1027 bacteria into the caudal vein, or were mock-injected with buffer as a control. After injections embryos were transferred into fresh egg water and incubated for 8 h at 28M-BM-0C. After the incubation period, pools of 15-20 embryos per treatment group were snap-frozen in liquid nitrogen and RNA was isolated for microarray analysis. All treatment groups were analyzed using a common reference approach.

			Action	DRS
	AF-DDA_lib.zip	Other
	AF-SWATH.zip	Other
	SB-DDA_lib.zip	Other
	SB-SWATH.zip	Other
	S_baltica_M1-processed.xlsx	Xlsx

Dataset Information

Three Microbial Musketeers of the Seas: Shewanella baltica, Aliivibrio fischeri and Vibrio harveyi, and their adaptation to different salinity probed by a proteomic approach

Dataset's files

Publications

Three Microbial Musketeers of the Seas: <i>Shewanella baltica</i>, <i>Aliivibrio fischeri</i> and <i>Vibrio harveyi</i>, and Their Adaptation to Different Salinity Probed by a Proteomic Approach.

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