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GCAF(TMEM251) regulates lysosome biogenesis by activating the mannose-6-phosphate pathway

ABSTRACT: GCAF(TMEM251) regulates lysosome biogenesis by activating the mannose-6-phosphate pathway

PROVIDER: PRJNA861993 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20614683_1.fastq.gz	Fastqsanger.gz
	SRR20614683_2.fastq.gz	Fastqsanger.gz
	SRR20614684_1.fastq.gz	Fastqsanger.gz
	SRR20614684_2.fastq.gz	Fastqsanger.gz
	SRR20614685_1.fastq.gz	Fastqsanger.gz

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Analysis of intact mannose-6-phosphate glycopeptides

Project description:We have repurposed standard phosphoproteomics workflow based on Fe3+IMAC for enrichment ofmannose-6-phosphate modified glycopeptides. This worklfow was used to profile lysosomal acid hydrolases in HeLa and CHO cell lines. We have combined this approach with CRISPR/Cas9 KO of acid phosphatases 2 and 5 responsible for dephosphorylation of mannose-6-phosphate glycopeptides in the lysosome. This combined approach enabled significantly deeper coverage of CHO mannose-6-phosphate glycoproteome.

2018-12-18 | PXD010333 | Pride

GCAF(TMEM251) regulates lysosome biogenesis by activating the mannose-6-phosphate pathway.

Project description:The mannose-6-phosphate (M6P) biosynthetic pathway for lysosome biogenesis has been studied for decades and is considered a well-understood topic. However, whether this pathway is regulated remains an open question. In a genome-wide CRISPR/Cas9 knockout screen, we discover TMEM251 as the first regulator of the M6P modification. Deleting TMEM251 causes mistargeting of most lysosomal enzymes due to their loss of M6P modification and accumulation of numerous undigested materials. We further demonstrate that TMEM251 localizes to the Golgi and is required for the cleavage and activity of GNPT, the enzyme that catalyzes M6P modification. In zebrafish, TMEM251 deletion leads to severe developmental defects including heart edema and skeletal dysplasia, which phenocopies Mucolipidosis Type II. Our discovery provides a mechanism for the newly discovered human disease caused by TMEM251 mutations. We name TMEM251 as GNPTAB cleavage and activity factor (GCAF) and its related disease as Mucolipidosis Type V.

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GCAF(TMEM251) regulates lysosome biogenesis by activating the mannose-6-phosphate pathway

Project description:To investigate the expression profilings after knocking out TMEM251. We then performed gene expression profiling analysis using data obtained from RNA-seq of 3 different TMEM251 sgRNA knockout cells compared to WT

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Phosphosugar stress in Bacillus subtilis: Intracellular accumulation of mannose 6-phosphate derepresed the glcR-phoC operon from repression by GlcR

Project description:Bacillus subtilis phosphorylates sugars during or after their transport into the cell.Perturbation in the conversion of intracellular phosphosugars to the central carbon metabolitesand accumulation of phosphosugars can impose stress on the cells. In this study, we investigated the effect of phosphosugar stress on B. subtilis. Preliminary experiments indicated that the non-matabolizable analogs of glucose were unable to impose stress on B. subtilis. In contrast, deletion of manA encoding mannose 6-phosphate isomerase (responsible for conversion of mannose 6-phosphate to fructose 6-phosphate) resulted in growth arrest and bulged cell shape in the medium containing mannose. Besides, an operon encoding a repressor (GlcR) and a haloic acid dehalogenase (HAD)-like phosphatase (PhoC; previously YwpJ) were upregulated. Integration of the PglcR-lacZ cassette into different mutational backgrounds indicated that PglcR is induced when (i) a manA-deficient strain is cultured with mannose or (ii) when glcR is deleted.GlcR represses the transcription of glcR-phoC bybinding to the A-type core elements of PglcR. Electrophoretic mobility shift assay showed no interaction between mannose 6-phosphate (or other phosphosugars) and the GlcR-PglcR DNA complex. PhoCwas an acid phosphatase mainly able to dephosphorylate glycerol 3-phosphate and ribose 5- phosphate. Mannose 6-phosphatewas only weakly dephosphorylated by PhoC. Since deletion of glcR and phoCalone or in combination had no effect on the cell duringphosphosugar stress,it is assumed that the derepression of glcR-phoC is a side effect of phosphosugar stress in B. subtilis.

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Mouse Liver Mannose-6-Phosphate Glycoproteome LC-MSMS

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