Modulation of the complex regulatory network for methionine biosynthesis in fungi
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA680785 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR13143382_1.fastq.gz | Fastqsanger.gz | |||
| SRR13143382_2.fastq.gz | Fastqsanger.gz | |||
| SRR13143383_1.fastq.gz | Fastqsanger.gz | |||
| SRR13143383_2.fastq.gz | Fastqsanger.gz | |||
| SRR13143384_1.fastq.gz | Fastqsanger.gz |
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Project description:In this study, C. albicans regulates its methionine biosynthetic pathways using the transcription factors Met4 and Cbf1. This circuitry appears more complex than that of filamentous fungi, which use orthologs of the Met4 transcription factor, but lack versions of Cbf1, but is considerably less complex than that of S. cerevisiae, which 2 requires two transcription complexes, involving Cbf1 and Met31/32 as DNA binding modules, and Met4 and the Met4 ortholog Met28 as co-activators, to regulate Met biosynthesis. Although C. albicans contains Met31/32 and Met28 orthologs, they do not appear to be linked to regulation of the methionine circuit. Thus, the phylogenetic progression from filamentous fungi to S. cerevisiae is characterized by increasing complexity of the regulators, although the structural elements of the pathways are fundamentally the same.
2020-11-26 | GSE162171 | GEO
Project description:The assimilation of inorganic sulfate and the synthesis of the sulfur-containing amino acids methionine and cysteine is mediated by a multibranched biosynthetic pathway. We have investigated this circuitry in the fungal pathogen Candida albicans, which is phylogenetically intermediate between the filamentous fungi and Saccharomyces cerevisiae. In S. cerevisiae, this pathway is regulated by a collection of five transcription factors (Met4, Cbf1, Met28, and Met31/Met32), while in the filamentous fungi the pathway is controlled by a single Met4-like factor. We found that in C. albicans, the Met4 ortholog is also a core regulator of methionine biosynthesis, where it functions together with Cbf1. While C. albicans encodes this Met4 protein, a Met4 paralog designated Met28 (Orf19.7046), and a Met31 protein, deletion, and activation constructs suggest that of these proteins only Met4 is actually involved in the regulation of methionine biosynthesis. Both Met28 and Met31 are linked to other functions; Met28 appears essential, and Met32 appears implicated in the regulation of genes of central metabolism. Therefore, while S. cerevisiae and C. albicans share Cbf1 and Met4 as central elements of the methionine biosynthesis control, the other proteins that make up the circuit in S. cerevisiae are not members of the C. albicans control network, and so the S. cerevisiae circuit likely represents a recently evolved arrangement.
| S-EPMC8045735 | biostudies-literature
Project description:Ergosterol, a pivotal constituent of the fungal cell membrane, plays a crucial role in diverse cellular activities. Fungi inherently regulate ergosterol homeostasis, a process traditionally associated with the control of a major transcription factor, like SREBP, activated in response to ergosterol depletion, regardless of which ergosterol biosynthesis step is affected. Contrary to the established paradigm, our investigation demonstrates that the inhibition of ergosterol biosynthesis at specific steps triggers distinct transcriptional responses in erg genes across fungi, including Neurospora crassa, Aspergillus fumigatus, and Fusarium verticillioides. In N. crassa, the targeted responses are orchestrated by several transcription factors that have undergone functional rewiring. Specifically, ERG24 inhibition by amorolfine activates transcription factors SAH-2 and AtrR, resulting in the upregulation of erg24, erg2, erg25 and erg3. Additionally, ERG11 inhibition by azoles activates transcription factor NcSR, leading to the upregulation of erg11 and erg6. Our findings unveil a novel sophisticated regulation model of sterol biosynthesis in fungi which potentially enhances fungal survival in complex environments, thus providing new insights into sterol homeostasis maintenance and a deeper understanding of drug resistance mechanisms in fungi.
2024-03-24 | GSE261900 | GEO
Project description:Besides being building blocks for protein synthesis, amino acids serve a wide variety of cellular functions, including acting as metabolic intermediates for ATP generation and for redox homeostasis. Upon amino acid deprivation, free uncharged tRNAs trigger GCN2-ATF4 to mediate the well-characterized transcriptional amino acid response (AAR). However, it is not clear whether the deprivation of different individual amino acids triggers identical or distinct AARs. Here, we characterized the global transcriptional response upon deprivation of one amino acid at a time. With the exception of glycine, which was not required for the proliferation of MCF7 cells, we found that the deprivation of most amino acids triggered a shared transcriptional response that included the activation of ATF4, p53 and TXNIP. However, there was also significant heterogeneity among different individual AARs. The most dramatic transcriptional response was triggered by methionine deprivation, which activated an extensive and unique response in different cell types. We uncovered that the specific methionine-deprived transcriptional response required creatine biosynthesis. This dependency on creatine biosynthesis was caused by the consumption of S-Adenosyl-L-methionine (SAM) during creatine biosynthesis that helps to deplete SAM under methionine deprivation and reduces histone methylations. As such, the simultaneous deprivation of methionine and sources of creatine biosynthesis (either arginine or glycine) abolished the reduction of histone methylation and the methionine-specific transcriptional response. Arginine-derived ornithine was also required for the complete induction of the methionine-deprived specific gene response. Collectively, our data identify a previously unknown set of heterogeneous amino acid responses and reveal a distinct methionine-deprived transcriptional response that results from the crosstalk of arginine, glycine and methionine metabolism via arginine/glycine-dependent creatine biosynthesis. RNA was extracted by RNAeasy kits (Qiagen) from the MCF7 or PC3 cells which exposed to the control full DMEM or deprived one (or all) amino acid media for 24 or 48 hours.
2015-04-01 | E-GEOD-62673 | biostudies-arrayexpress
Project description:Resistance to agricultural fungicides in the field has created a need for discovering fungicides with new modes of action. DNA microarrays, because they provide information on expression of many genes simultaneously, could help to identify the modes of action. To begin an expression pattern database for agricultural fungicides, transcriptional patterns of Saccharomyces cerevisiae strain S288C genes were analysed following 2-h treatments with I50 concentrations of ergosterol biosynthesis inhibitors commonly used against plant pathogenic fungi. Eight fungicides, representing three classes of ergosterol biosynthesis inhibitors, were tested. To compare gene expression in response to a fungicide with a completely different mode of action, a putative methionine biosynthesis inhibitor (MBI) was also tested. Expression patterns of ergosterol biosynthetic genes supported the roles of Class I and Class II inhibitors in affecting ergosterol biosynthesis, confirmed that the putative MBI did not affect ergosterol biosynthesis, and strongly suggested that in yeast, the Class III inhibitor did not affect ergosterol biosynthesis. The MBI affected transcription of three genes involved in methionine metabolism, whereas there were essentially no effects of ergosterol synthesis inhibitors on methionine metabolism genes. There were no consistent patterns in other up- or downregulated genes between fungicides. These results suggest that inspection of gene response patterns within a given pathway may serve as a useful first step in identifying possible modes of action of fungicides. agricultural sterol biosynthesis inhibitor fungicides. Keywords = agriculture Keywords = ergosterol Keywords = methionine Keywords = fungicide Keywords = Saccharomyces cerevisiae S288C Keywords = biosynthesis
2010-06-10 | E-GEOD-2412 | biostudies-arrayexpress
Project description:Besides being building blocks for protein synthesis, amino acids serve a wide variety of cellular functions, including acting as metabolic intermediates for ATP generation and for redox homeostasis. Upon amino acid deprivation, free uncharged tRNAs trigger GCN2-ATF4 to mediate the well-characterized transcriptional amino acid response (AAR). However, it is not clear whether the deprivation of different individual amino acids triggers identical or distinct AARs. Here, we characterized the global transcriptional response upon deprivation of one amino acid at a time. With the exception of glycine, which was not required for the proliferation of MCF7 cells, we found that the deprivation of most amino acids triggered a shared transcriptional response that included the activation of ATF4, p53 and TXNIP. However, there was also significant heterogeneity among different individual AARs. The most dramatic transcriptional response was triggered by methionine deprivation, which activated an extensive and unique response in different cell types. We uncovered that the specific methionine-deprived transcriptional response required creatine biosynthesis. This dependency on creatine biosynthesis was caused by the consumption of S-Adenosyl-L-methionine (SAM) during creatine biosynthesis that helps to deplete SAM under methionine deprivation and reduces histone methylations. As such, the simultaneous deprivation of methionine and sources of creatine biosynthesis (either arginine or glycine) abolished the reduction of histone methylation and the methionine-specific transcriptional response. Arginine-derived ornithine was also required for the complete induction of the methionine-deprived specific gene response. Collectively, our data identify a previously unknown set of heterogeneous amino acid responses and reveal a distinct methionine-deprived transcriptional response that results from the crosstalk of arginine, glycine and methionine metabolism via arginine/glycine-dependent creatine biosynthesis.
2015-04-01 | GSE62673 | GEO
Project description:Resistance to agricultural fungicides in the field has created a need for discovering fungicides with new modes of action. DNA microarrays, because they provide information on expression of many genes simultaneously, could help to identify the modes of action. To begin an expression pattern database for agricultural fungicides, transcriptional patterns of Saccharomyces cerevisiae strain S288C genes were analysed following 2-h treatments with I50 concentrations of ergosterol biosynthesis inhibitors commonly used against plant pathogenic fungi. Eight fungicides, representing three classes of ergosterol biosynthesis inhibitors, were tested. To compare gene expression in response to a fungicide with a completely different mode of action, a putative methionine biosynthesis inhibitor (MBI) was also tested. Expression patterns of ergosterol biosynthetic genes supported the roles of Class I and Class II inhibitors in affecting ergosterol biosynthesis, confirmed that the putative MBI did not affect ergosterol biosynthesis, and strongly suggested that in yeast, the Class III inhibitor did not affect ergosterol biosynthesis. The MBI affected transcription of three genes involved in methionine metabolism, whereas there were essentially no effects of ergosterol synthesis inhibitors on methionine metabolism genes. There were no consistent patterns in other up- or downregulated genes between fungicides. These results suggest that inspection of gene response patterns within a given pathway may serve as a useful first step in identifying possible modes of action of fungicides. agricultural sterol biosynthesis inhibitor fungicides. Keywords = agriculture Keywords = ergosterol Keywords = methionine Keywords = fungicide Keywords = Saccharomyces cerevisiae S288C Keywords = biosynthesis
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Project description:Sterol biosynthesis is regulated by a sophisticated regulatory network involving multiple transcription factors in fungi
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Project description:In this study, screening efforts identified novel antifolates with potent, targeted activity against whole cell Mycobacterium tuberculosis. Liquid chromatography-mass spectrometry analysis of antifolate-treated cultures revealed unique metabolic disruption, including decreased pools of methionine and S-adenosylmethionine. Transcriptomic analysis highlighted up-regulation genes involved in the biosynthesis and utilization of methionine. Supplementation with amino acids or methionine derivatives was sufficient to rescue cultures from MIC-level antifolate treatment. Instead of the “thymineless death” that characterizes folate pathway inhibition in a wide variety of organisms, these data suggest that M. tuberculosis is vulnerable to a critical disruption of the biosynthesis of methionine-derived compounds. These arrays look at the expression profile triggered by exposure to three different anti-folates (WR99210, dimethyl and diethyl methotrexate) in three biological replicates and in a matched set of untreated samples.
2014-03-19 | E-GEOD-55979 | biostudies-arrayexpress
Project description:Synergistic effects of PARP inhibition and cholesterol biosynthesis modulation
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