Vibrio cholerae lon protease mutant microarray analysis
Ontology highlight
ABSTRACT:
ORGANISM(S): Vibrio cholerae
SUBMITTER: Sinem Beyhan
PROVIDER: E-GEOD-73023 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:Lon protease plays vital roles in many biological processes in Pseudomonas syringae, including type III secretion systems (T3SS), transcription regulation, protein synthesis and energy metabolism. Lon also functions as a transcriptional regulator in other bacterial species (e.g., Escherichia coli and Brevibacillus thermoruber). Therefore, we hypothesise that Lon has dual functions in P. syringae. To reveal the molecular mechanisms of Lon as a transcriptional regulator and protease under different environmental conditions, we used a combination of transcriptome sequencing (RNA-seq), chromatin immunoprecipitation sequencing (ChIP-seq) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) to identify the genes or proteins regulated by Lon. As a transcriptional regulator, Lon bound to the promoter regions of PSPPH_4788, gacA, fur, gntR, clpS, lon and glyA and consequently regulated 1-dodecanol oxidation activity, motility, pyoverdine production, gluconokinase activity, N-end rule pathway, lon expression and serine hydroxymethyltransferase (SHMT) activity in King’s B medium (KB). In minimal medium (MM), Lon regulated SHMT activity and lon expression by binding to the promoter regions of glyA and lon, respectively. As a protease, Lon regulated the T3SS and metabolic pathways (e.g., amino acid metabolism). In MM, Lon regulated the polysaccharide metabolic process by controlling PSPPH_0514, AlgA, CysD and PSPPH_4991. Taken together, these data demonstrate that Lon acts as a transcriptional regulator or protease in different environments and tunes its virulence and metabolic functions accordingly.
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Project description:Nutrient adaptation is key in limiting environments for the promotion of microbial growth and survival. In microbial systems, iron is an essential component for many cellular processes and bioavailability varies greatly among different conditions. In the bacterium, Klebsiella pneumoniae, the impact of iron limitation is known to alter transcriptional expression of iron-acquisition pathways and influences the secretion of iron-binding siderophores; however, a comprehensive view of iron limitation at the protein-level remains to be defined. Here, we apply a mass spectrometry-based quantitative proteomics strategy to profile the global impact of iron limitation on the cellular proteome and extracellular environment (secretome) of K. pneumoniae. Our data defines the impact of iron on proteins involved in transcriptional regulation and emphasizes the modulation of a vast array of proteins associated with iron acquisition, transport, and binding. We also identify proteins in the extracellular environment associated with conventional and nonconventional modes of secretion, as well as vesicle release. In particular, we demonstrate a new role for Lon protease in promoting iron homeostasis outside of the cell. Our characterization of Lon protease in K. pneumoniae validates roles in bacterial growth, cell division, iron utilization, and virulence. Moreover, our results uncover novel degradation candidates of Lon protease. Overall, we provide evidence of novel connections between Lon and iron in a bacterial system and define a unique role for Lon protease in the extracellular environment during nutrient limitation.
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Project description:Lon protease is known to regulate various transcriptional regulators in other bacterial organisms. To understand whether lon protease is involved in transcriptional changes in Vibrio cholerae, wholel-genome level transcriptional profiling was performed using custom microarrays. Transcriptomes of lonA mutant and wild-type strains were compared in this study.
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Project description:With this analysis we aim to identify proteins that are substrates of LarA-activated Lon protease in Caulobacter crescentus. We will compare samples of wild type cells either harboring an empty vector (vector control, VC) or overexpressing 3xFLAG-tagged LarA (F-LarA). Based on our previous data we hypothesize that proteins affected by LarA-overexpression which results in Lon protease activation will decrease in levels compared to the vector control sample. The aim of this analysis is the identification of the interactome of the Lon protease in Caulobacter crescentus. It is a follow-up analysis of a project in which we were looking for novel substrates of the Lon protease in Caulobacter crescentus. To narrow down the list of potential substrates we obtained through the first analysis, we have purified the protease (Lon WT) as well an inactive TRAP mutant and interacting proteins using a Twin-Strep-tag (Iba lifesciences). As a control, a cell lysate without Strep-tag containing protein was included in the purification set-up. The aim is to identify the proteins that specifically interact with the Lon protease by mass spectrometry.
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