Comparative Proteomics Reveals Salinity Response Strategies in Methanotrophic Bacteria
Ontology highlight
ABSTRACT:
ORGANISM(S): Methylococcus Capsulatus Str. Bath Methylomonas Sp. Lw13 Methylosinus Sp. Lw4 Methylocystis Parvus Obbp
SUBMITTER: 
Yue Zheng
PROVIDER: PXD075433 | iProX | Tue Mar 10 00:00:00 GMT 2026
REPOSITORIES: iProX
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Project description: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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Project description:Background: Salinity is an important abiotic stress that influences the physiological and metabolic activity, reproduction, growth and development of marine fish. It has been suggested that half-smooth tongue sole (Cynoglossus semilaevis), a euryhaline fish species, use a large amount of energy to maintain osmotic pressure balance when exposed to fluctuations in salinity. To delineate the molecular response of C. semilaevis to different levels of salinity, we performed RNA-seq analysis of the liver to identify the genes and molecular and biological processes involved in responding to salinity change. Results: The present study yielded 330.4 million clean reads, of which 83.9% were successfully mapped to the reference genome of C. semilaevis. One hundred twenty-eight differentially expressed genes (DEGs), including 43 up-regulated genes and 85 down-regulated genes, were identified. These DEGs were highly represented in metabolic pathways, steroid biosynthesis, terpenoid backbone biosynthesis, butanoate metabolism, glycerolipid metabolism and the 2-oxocarboxylic acid metabolism pathway. In addition, genes involved in metabolism, osmoregulation and ion transport, signal transduction, immune response and stress response, cytoskeleton remodeling, and apoptosis were affected during acclimation to low salinity. Genes acat2, fdps, hmgcr, hmgcs1, mvk, pmvk, ebp, lss, dhcr7, and dhcr24 were up-regulated and abat, ddc, acy1 were down-regulated in metabolic pathways. Genes aqp10 and slc6a6 were down-regulated in osmoregulation and ion transport. Genes abat, fdps, hmgcs1, mvk, pmvk and dhcr7 were first reported to be associated with salinity adaptation in teleosts. Conclusions: Our results revealed that metabolic pathways, especially lipid metabolism were important for salinity adaptation. The candidate genes identified from this study provide a basis for further studies to investigate the molecular mechanism of salinity adaptation and transcriptional plasticity in marine fish.
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