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Microprocessor depends on hemin to recognize the apical loop of primary microRNA

ABSTRACT: Microprocessor depends on hemin to recognize the apical loop of primary microRNA

PROVIDER: PRJNA436986 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6932950.fastq.gz	Fastqsanger.gz
	SRR6932941.fastq.gz	Fastqsanger.gz
	SRR6932951.fastq.gz	Fastqsanger.gz
	SRR6932942.fastq.gz	Fastqsanger.gz
	SRR6932952.fastq.gz	Fastqsanger.gz

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Microprocessor depends on hemin to recognize the apical loop of primary microRNA

Project description:Microprocessor, which consists of a ribonuclease III DROSHA and its cofactor DGCR8, initiates microRNA (miRNA) maturation by cleaving primary miRNA transcripts (pri-miRNAs). We recently demonstrated that the DGCR8 dimer recognizes the apical elements of pri-miRNAs, including the UGU motif, to accurately locate and orient Microprocessor on pri-miRNAs. However, the mechanism underlying the selective RNA binding remains unknown. In this study, we find that hemin, a ferric ion-containing porphyrin, enhances the specific interaction between the apical UGU motif and the DGCR8 dimer, allowing Microprocessor to achieve high efficiency and fidelity of pri-miRNA processing in vitro. Furthermore, by generating a DGCR8 mutant cell line and carrying out rescue experiments, we discover that hemin preferentially stimulates the expression of miRNAs possessing the UGU motif, thereby conferring differential regulation of miRNA maturation. Our findings reveal the molecular action mechanism of hemin in pri-miRNA processing and establish a novel function of hemin in inducing specific RNA-protein interaction.

2018-03-26 | GSE111431 | GEO

Microprocessor depends on hemin to recognize the apical loop of primary microRNA.

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Hemin and iron transcriptome of Porphyromonas gingivalis (part 1)

Project description:Transcriptional profiling of P. gingivalis cells comparing cells grown under hemin replete conditions to that grown under hemin depleted conditions Two-condition experiment, hemin replete vs. hemin deplete grown cells. Biological replicates: 3 independently grown and harvested bacterial cells. Four technical replicates (four replicates per array).

2015-05-18 | E-GEOD-50701 | biostudies-arrayexpress

Microprocessor recruitment to elongating RNA Polymerase II is required for differential expression of microRNAs

Project description:The cellular abundance of mature microRNAs (miRNAs) is dictated by the efficiency of nuclear processing of primary miRNA transcripts (pri-miRNAs) into pre-miRNA intermediates. The Microprocessor complex of Drosha and DGCR8 carries this out, but it has been unclear what controls Microprocessor's differential processing of various pri-miRNAs. Here, we show that Drosophila DGCR8 (Pasha) directly associates with the C terminal domain of the RNA polymerase II elongation complex when it is phosphorylated by the Cdk9 kinase (pTEFb). When association is blocked by loss of Cdk9 activity, a global change in pri-miRNA processing is detected. Processing of pri-miRNAs with a UGU sequence motif in their apical junction domain increases, while processing of pri-miRNAs lacking this motif decreases. Therefore, phosphorylation of RNA polymerase II recruits Microprocessor for co-transcriptional processing of non-UGU pri-miRNAs that would otherwise be poorly processed. In contrast, UGU-positive pri-miRNAs are robustly processed by Microprocessor independent of RNA polymerase association.

2017-09-15 | GSE103234 | GEO

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Project description:Transcriptional profiling of P. gingivalis cells comparing cells grown under hemin replete conditions to that grown under hemin depleted conditions

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Effect of interleukin-10 on primary oligodendrocyte progenitor cells under hemin administration

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Project description:The human Microprocessor complex cleaves primary microRNA (miRNA) transcripts (pri-miRNAs) to initiate miRNA synthesis. Microprocessor consists of DROSHA (an RNase III enzyme), and DGCR8. DROSHA has two conserved RNase III domains, which make double cuts on each of pri-miRNA strands. In this study, we show that Microprocessor has an unexpected single-cut activity, which creates a single cut on just one of the pri-miRNA strands using one of the two RNase III domains of DROSHA. This cleavage does not lead to the production of miRNA but instead it downregulates miRNA expression. We also demonstrate that certain RNA elements facilitate the single-cut activity of Microprocessor, and by manipulating these elements, we can regulate the ratio of single-cut to double-cut activities, thus controlling miRNA production both in vitro and in vivo.

2020-01-24 | GSE138950 | GEO

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