Ontology highlight
ABSTRACT:
PROVIDER: PRJNA825897 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR18733648_1.fastq.gz | Fastqsanger.gz | |||
| SRR18733648_2.fastq.gz | Fastqsanger.gz | |||
| SRR18733649_1.fastq.gz | Fastqsanger.gz | |||
| SRR18733649_2.fastq.gz | Fastqsanger.gz | |||
| SRR18733650_1.fastq.gz | Fastqsanger.gz |
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Project description:Explore the genome-scale influence of ccpA gene knock out on Staphylococcus aureus XN108
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Project description:Background The catabolite control protein A (CcpA) is a member of the LacI/GalR family of transcriptional regulators controlling carbon-metabolism pathways in low-GC Gram positive bacteria. It functions as a catabolite repressor or activator, allowing the bacteria to utilize the preferred carbon source over secondary carbon sources. This study is the first CcpA-dependent transcriptome and proteome analysis in S. aureus wild type and ccpA-deleted mutant, focussing on short-time effects of glucose under stable pH conditions. Results The addition of glucose to exponentially growing S. aureus increased enzymes of glycolytic pathway, indicating a higher glycolytic activity, while proteins required for the complete oxidation in the TCA cycle were repressed via CcpA. Phosphotransacetylase and acetate kinase, converting acetylCoA to acetate with a concomitant substrate-level phosphorylation were neither regulated by glucose nor by CcpA. Most CcpA directly repressed genes were involved in utilization of amino acids as secondary carbon sources. More genes were found to be differentially expressed by CcpA in a glucose-independent manner than in the classical, glucose dependent way, suggesting that glucose-independent regulation by CcpA may be of particular importance in S. aureus. In the presence of glucose, CcpA was found to regulate expression of genes involved in metabolism, but that of genes coding for virulence determinants. Conclusions This study identified the CcpA regulon of exponentially growing S. aureus, for the first time. As in other bacteria, the CcpA-regulon of S. aureus comprised a large amount of metabolic genes but also some 50 genes associated with virulence. CcpA seemed to work in a glucose- as well as glucose-independent way.
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Project description:Total cytosolic protein fractions of Staphylococcus aureus strains SA564, SA564-ΔhptRS, SA564-ΔccpA and SA564-ΔhptRS/ccpA were analyzed by LC-MSE . Five biological replicates of each strain, cultivated in TSB and TSB-dex, during the exponential (2h) and post exponential (6h) growth phases (80 samples) were investigated.
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Project description:Staphylococcus aureus is a medically important pathogen that exhibit high metabolic versatility allowing it to infect various niches within a host. S. aureus utilizes two major transcriptional regulators, CodY and CcpA, to remodel metabolic and virulence gene expression in response to changing environmental conditions. Previous studies revealed that inactivation of either codY or ccpA has a pronounced impact on different aspects of staphylococcal physiology and pathogenesis. To determine the contribution and interplay of these two regulators in modulating central metabolism, virulence, and biofilm development we constructed and characterized codY ccpA double mutant in S. aureus UAMS-1. In line with previous studies, we found that CcpA and CodY control cellular metabolic status by altering carbon flow through the central and overflow metabolic pathways. Our results demonstrate that ccpA inactivation impairs biofilm formation and decreases incorporation of eDNA into the biofilm matrix while disrupting codY resulted in a robust structured biofilm tethered together with eDNA and PIA. Interestingly, inactivation of both codY and ccpA decreases biofilm biomass and neglects eDNA release in the double mutant. Compared to inactivation of codY, the codY ccpA mutant did not overexpress toxins but maintained overexpression of amino acid metabolism pathways. Furthermore, codY ccpA mutant produced higher amounts of PIA, in contrast to the wild-type strain and ccpA mutant. Overall, results of this study suggest that interplay between CodY and CcpA modulates central metabolism to optimize growth on preferred carbon sources while repressing virulence gene expression until nutrient limitation requires scavenging nutrients from the host.
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Project description:Background The catabolite control protein A (CcpA) is a member of the LacI/GalR family of transcriptional regulators controlling carbon-metabolism pathways in low-GC Gram positive bacteria. It functions as a catabolite repressor or activator, allowing the bacteria to utilize the preferred carbon source over secondary carbon sources. This study is the first CcpA-dependent transcriptome and proteome analysis in S. aureus wild type and ccpA-deleted mutant, focussing on short-time effects of glucose under stable pH conditions. Results The addition of glucose to exponentially growing S. aureus increased enzymes of glycolytic pathway, indicating a higher glycolytic activity, while proteins required for the complete oxidation in the TCA cycle were repressed via CcpA. Phosphotransacetylase and acetate kinase, converting acetylCoA to acetate with a concomitant substrate-level phosphorylation were neither regulated by glucose nor by CcpA. Most CcpA directly repressed genes were involved in utilization of amino acids as secondary carbon sources. More genes were found to be differentially expressed by CcpA in a glucose-independent manner than in the classical, glucose dependent way, suggesting that glucose-independent regulation by CcpA may be of particular importance in S. aureus. In the presence of glucose, CcpA was found to regulate expression of genes involved in metabolism, but that of genes coding for virulence determinants. Conclusions This study identified the CcpA regulon of exponentially growing S. aureus, for the first time. As in other bacteria, the CcpA-regulon of S. aureus comprised a large amount of metabolic genes but also some 50 genes associated with virulence. CcpA seemed to work in a glucose- as well as glucose-independent way. The transcriptomes of strain Newman and its isogenic ccpA-deleted mutant were determined in early exponential growth and 30 min after the addition of 10 mM glucose, under controlled pH conditions. In the absence of glucose, the wild type grew slightly faster than the mutant, reaching an OD600 of 1 approximately 20 min earlier than the mutant. Adding 10 mM glucose at OD600 1 increased the growth rate of the wild type but had only a minor effect on that of the mutant. 60 min after glucose addition, glucose was depleted down to 0.3 mM by the wild type, while still 3 mM glucose was left in the culture of the mutant. Despite increased glucose consumption rates in the wild type, acetate production was only slightly enhanced compared to the mutant. No lactate was excreted at any time point sampled. Acidification of the medium upon glucose metabolism was prevented by buffering, maintaining a pH of 7.5 for both strains and under both growth conditions for at least 2 h after glucose addition, allowing to rule out any pH effects.
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