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Mouse Brain Mannose-6-Phosphate Glycoproteome LC-MSMS

ABSTRACT: This is the raw data and Byonic search results of mouse mouse brain Mannose-6-Phosphate glycoproteome.

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Brain

SUBMITTER: Junfeng Huang

LAB HEAD: Lingjun Li

PROVIDER: PXD012400 | Pride | 2020-03-11

REPOSITORIES: Pride

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Dataset's files

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			Action	DRS
	M_Brain_10ACN10NH3.raw	Raw
	M_Brain_10ACN10NH3.xlsx	Xlsx
	M_Brain_10NH3.raw	Raw
	M_Brain_10NH3.xlsx	Xlsx
	M_Brain_20ACN10NH3.raw	Raw

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Publications

Dual-Functional Titanium(IV) Immobilized Metal Affinity Chromatography Approach for Enabling Large-Scale Profiling of Protein Mannose-6-Phosphate Glycosylation and Revealing Its Predominant Substrates.

Huang Junfeng J Dong Jing J Shi Xudong X Chen Zhengwei Z Cui Yusi Y Liu Xiaoyan X Ye Mingliang M Li Lingjun L

Analytical chemistry 20190822 18

Mannose-6-phosphate (M6P) glycosylation is an important post-translational modification (PTM) and plays a crucial role in transferring lysosomal hydrolases to lysosome, and is involved in several other biological processes. Aberrant M6P modifications have been implicated in lysosomal storage diseases and numerous other disorders including Alzheimer's disease and cancer. Research on profiling of intact M6P glycopeptides remains challenging due to its extremely low stoichiometry. Here we propose a ...[more]

PMID: 31398006

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Mouse Lung Mannose-6-Phosphate Glycoproteome LC-MSMS

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Identification of a fourth mannose 6-phosphate binding site in the cation-independent mannose 6-phosphate receptor.

Project description:The 300 kDa cation-independent mannose 6-phosphate receptor (CI-MPR) plays an essential role in lysosome biogenesis by targeting ? 60 different phosphomannosyl-containing acid hydrolases to the lysosome. This type I membrane glycoprotein has a large extracellular region comprised of 15 homologous domains. Two mannose 6-phosphate (M6P) binding sites have been mapped to domains 3 and 9, whereas domain 5 binds preferentially to the phosphodiester, M6P-N-acetylglucosamine (GlcNAc). A structure-based sequence alignment predicts that the C-terminal domain 15 contains three out of the four conserved residues identified as essential for carbohydrate recognition by domains 3, 5 and 9 of the CI-MPR, but lacks two cysteine residues that are predicted to form a disulfide bond. To determine whether domain 15 of the CI-MPR has lectin activity and to probe its carbohydrate-binding specificity, truncated forms of the CI-MPR were tested for binding to acid hydrolases with defined N-glycans in surface plasmon resonance analyses, and used to interrogate a phosphorylated glycan microarray. The results show that a construct encoding domains 14-15 binds both M6P and M6P-GlcNAc with similar affinity (Kd = 13 and 17 ?M, respectively). Site-directed mutagenesis studies demonstrate the essential role of the conserved Tyr residue in domain 15 for phosphomannosyl binding. A structural model of domain 15 was generated that predicted an Arg residue to be in the binding pocket and mutagenesis studies confirmed its important role in carbohydrate binding. Together, these results show that the CI-MPR contains a fourth carbohydrate-recognition site capable of binding both phosphomonoesters and phosphodiesters.

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Project description:Most luminal lysosomal proteins are synthesized as precursors containing mannose 6-phosphate (Man6-P) and a number of recent studies have conducted affinity purification of Man6-P containing proteins as a step toward defining the composition of the lysosome. Approximately 60 known lysosomal proteins have been found in such studies as well as many other Man-6-P glycoproteins, some of which represent new lysosomal proteins. The latter are of considerable interest from cell-biological and biomedical perspectives, but differentiating between them and other proteins remains a significant challenge. The aim of this study was to conduct a global analysis of the mammalian Man6-P glycoproteome, implementing technical and biostatistical methods to aid in the discovery and validation of lysosomal candidates. We purified Man6-P glycoproteins from 17 individual rat tissues. To distinguish nonspecific contaminants (i.e., abundant or "sticky" proteins that are not fully removed during purification) from specifically purified proteins, we conducted a semiquantitative mass spectrometric comparison of protein levels in nonspecific mock eluates versus specific affinity chromatography eluates to identify those proteins that are specifically purified. We identified 60 known lysosomal proteins, representing nearly all that are currently known to contain Man-6-P. We also find 136 other proteins that are specifically purified but which are not known to have lysosomal function. This approach provides a list of candidate lysosomal proteins and also provides insights into the relative distribution of Man6-P glycoproteins.

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Synthesis of high-mannose oligosaccharides containing mannose-6-phosphate residues using regioselective glycosylation.

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Enzyme therapy in mannose receptor-null mucopolysaccharidosis VII mice defines roles for the mannose 6-phosphate and mannose receptors.

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