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Study of peptides produced during proteasomal degradation of MBP (Myelin basic protein) and IGF-1 (insuline-like growth factor 1) in presence and absence of PA28γ

ABSTRACT: In vitro degradation of MBP and chemically denatureted IGF-1 by 20S and PA28γ-20S proteasomes and tandem mass spectrometry (MS/MS) qualitative and semi-quantitative analysis of the entire spectrum of peptides produced

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human) Bos Taurus (bovine)

TISSUE(S): Cell Culture

SUBMITTER: angela cattaneo

LAB HEAD: Angela Bachi

PROVIDER: PXD029248 | Pride | 2024-01-24

REPOSITORIES: Pride

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			Action	DRS
	PC_210219_MBP_1.raw	Raw
	PC_210219_MBP_1r.raw	Raw
	PC_210219_MBP_2.raw	Raw
	PC_210219_MBP_2r.raw	Raw
	PC_210219_MBP_3.raw	Raw

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Publications

PA28γ-20S proteasome is a proteolytic complex committed to degrade unfolded proteins.

Frayssinhes Jean-Yves Alejandro JA Cerruti Fulvia F Laulin Justine J Cattaneo Angela A Bachi Angela A Apcher Sebastien S Coux Olivier O Cascio Paolo P

Cellular and molecular life sciences : CMLS 20211216 1

PA28γ is a nuclear activator of the 20S proteasome that, unlike the 19S regulatory particle, stimulates hydrolysis of several substrates in an ATP- and ubiquitin-independent manner and whose exact biological functions and molecular mechanism of action still remain elusive. In an effort to shed light on these important issues, we investigated the stimulatory effect of PA28γ on the hydrolysis of different fluorogenic peptides and folded or denatured full-length proteins by the 20S proteasome. Impo ...[more]

PMID: 34913092

Similar Datasets

Myelin basic protein fragmentation by engineered human proteasomes with different catalytic phenotypes revealed direct peptide ligands of MS-associated and protective HLA class I molecules

Project description:Proteasomes exist in mammalian cells in multiple combinatorial variants due to the broadly diversified regulatory particles and catalytic subunits exchange. Here, using biotin carboxyl carrier domain of transcarboxylase from Propionibacterium shermanii fused with different proteasome subunits of catalytic and regulatory particles, we report comprehensive characterization of highly homogenous one-step purified human constitutive and immune 20S and 26S/30S proteasomes. Hydrolysis of multiple sclerosis (MS) autoantigen, myelin basic protein (MBP), by engineered human proteasomes with different catalytic phenotypes revealed peptides, which may be directly loaded on the HLA class I. Prediction of affinity of HLA class I to these peptides demonstrated that protective HLA I alleles are high affinity binders, whereas MS-associated alleles tend to have moderate-to-low affinity. Core peptide QDENPVVHFF, originated from the encephalitogenic MBP part, and its deaminated form was shown to be high affinity ligand for the protective HLA A*44, -B*40 and -B*35 alleles, demonstrating complexity of the autoimmune neurodegeneration.

2023-01-13 | PXD038387 | Pride

Immunodominant myelin basic protein fragments induce mechanical hypersensitivity.

Project description:An insulating myelin sheath ensures saltatory conduction of mechanosensory A afferents. Myelin damage results in the electrical instability of A fibers and the ability to generate pain in response to light touch/pressure (mechanical allodynia). We have hypothesized and then established that the release of T cell epitopes of myelin basic protein (MBP) enables nociceptive circuitry in myelinated fibers. Thus, mass spectrometry analysis of the rat sciatic nerve proteome followed by bioinformatics examination of the datasets revealed a loss of MBP and activation of T-helper cell signaling in the nerves undergoing chronic constriction injury (CCI). Matrix metalloproteinase-9 (MMP-9) proteolysis resulted in the MBP digest peptides, including the MBP84-104 and MBP68-86 regions, which exhibit prominent immunogenic epitopes. Myelin-forming Schwann cells and paranodal areas accumulated MHCII, MMP-9 and the degraded MBP at the sciatic nerve injury site. Administration of the immunodominant MBP84-104 and MBP68-86 peptides but not of the control peptides in a naïve rat sciatic nerve produced robust mechanical allodynia. Allodynia was accompanied by the T cell infiltration and an increase in MHCII, IL-17A and TNF- levels at the nerve injection site and the segmental ganglia. The pro-nociceptive activity of the synthetic MBP84-104 diminished in athymic nude rats lacking T cells. SB-3CT, an antagonist of MMP-9, inhibited mechanical allodynia, neuroinflammation and spinal sensitization after CCI. Collectively, our novel data implicate, for the first time, MMP-mediated cleavage of MBP and the resulting MBP digest fragments as a major cause of neuropathic pain. Gene extression profiling of total RNAs extracted from rat sciatic nerves, dorsal root ganglion and spinal cords after MBP84-104 peptide injection

2012-03-03 | E-GEOD-34868 | biostudies-arrayexpress

Immunodominant myelin basic protein fragments induce mechanical hypersensitivity.

2012-03-03 | GSE34868 | GEO

Comprehensive atlas of the myelin basic protein interaction landscape

Project description:Intrinsically disorder myelin basic protein (MBP) is one of the key autoantigens in autoimmune neurodegeneration and multiple sclerosis particularly. MBP is highly positively charged and lacks distinct structure in solution and therefore its intracellular part-ners are still mostly enigmatic. Here we used combination of formaldehyde-induced cross-linking followed by immunoprecipitation and Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) to elucidate the interaction network of MBP in mammalian cells and provide the list of potential MBP interacting proteins. Our data suggest that the largest group of MBP-interacting proteins belongs to cellular proteins involved in the protein translation machinery, as well as in the spatial and temporal regulation of translation. MBP interacts with core ribosomal proteins, RNA helicase Ddx28 and RNA-binding proteins STAU1, ADAR-1 and hnRNP A0, which are involved in various stages of RNA biogenesis and processing, including specific maintaining MBP-coding mRNA. Among MBP partners we identified CTNND1, which has previously been shown to be necessary for myelinating Schwann cells, for cell-cell interactions and the formation of a normal myelin sheath. MBP binds proteins MAGEB2/D2 associated with neurotrophin receptor p75NTR, involved in pathways that promote neuronal survival and neuronal death. Finally, we observed that MBP interacts with RNF40 – a component of heterotetrameric Rnf40/Rnf20 E3 ligase complex, recruited by Egr2, which is the central transcriptional regulator of peripheral myelination. Concluding, our data suggest that MBP may be more actively involved in myelination not only as a main building block but also as a regulating element.

2022-02-16 | PXD028685 | Pride

Myelin basic protein is an RNA chaperone in microglial nuclear retro-transport

Project description:CNS oligodendrocytes generate myelin, an RNA-containing proteolipid substance that enhances axonal transmission. In multiple sclerosis (MS), myelin debris is phagocytosed by microglia (MG), and prior studies have detected myelin-derived mRNA in MG nuclei, suggesting a retrograde transport pathway. We report myelin basic protein (MBP) is a nucleic acid–binding and trafficking protein. We found that retro-transport of myelin RNA into the MG nucleus was phagocytosis and importin-dependent. Transcriptomic and proteomic analyses of MG nuclei revealed enrichment of myelin mRNAs and proteins, with MBP singularly detected in soluble and chromatin-associated fractions. MBP bound mRNA with high affinity (Kd ≈ 0.30 nM) and was sufficient to facilitate MG RNA nuclear import in vitro and in vivo. Functionally, MBP mediated the delivery of small interfering RNAs for targeted knockdown of toll-like receptor 4. These findings indicate MBP as an RNA-binding protein capable of MG nuclear import, providing insight into neuroinflammatory pathology of MS.

2026-06-20 | GSE330818 | GEO

Expression data from Sertoli cells treated with 0.1μM NP, 0.1mM MBP, 0.1μM NP+0.1mM MBP and solvent control

Project description:The combined effects of NP and MBP were much more toxic than NP or MBP exposed alone. We used microarrays to detail the global programme of gene expression underlying cellularisation and identified distinct classes of up-regulated genes and miRNAs after treated with 0.1μM NP, 0.1mM MBP, 0.1μM NP+0.1mM MBP and solvent control.

2016-06-09 | GSE83105 | GEO

Identification of myelin basic protein interactome using TurboID proximity labeling proteomics

Project description:The protein environment of myelin basic protein (MBP), its uncharged form, and cyclindependent kinase inhibitor 1 (p21Cip1) were analyzed using two different approaches to identify protein partners thereof. The first one was a state-of-the-art enzymatic approach (TurboID), which utilizes an engineered biotin ligase that uses ATP to convert biotin to reactive biotin-AMP that covalently attaches to nearby proteins, followed by enrichment of biotin-labeled proteins on streptavidin beads and MS analysis of the resulting protein pool. Classical immunoprecipitation with Flag-tag fused to the target protein in combination with MS analysis was used as a reference method. As a result, two pools of potential interactors of MBP and uncharged MBP were identified. It was shown that TurboID, although giving a high level of background biotinylation, is a more reproducible technique compared to the immunoprecipitation, possibly due to higher affinity during the fraction enrichment process and easier maintaining of uniform conditions for the process, as well as interaction conditions being closer to in vivo conditions.

2023-01-25 | PXD039467 | Pride

Ophiostoma montium AA-MBP

Project description:Ophiostoma montium AA-MBP genome sequencing

| PRJNA345511 | ENA

Myelin basic protein phospholipid complexation likely competes with deimination in experimental autoimmune encephalomyelitis mouse model

Project description:Analysis of deimination of MBP in the precence of different phospholipid classes

2021-09-08 | PXD015494 | Pride

The constitutive 20S proteasome is required for the maintenance and differentiation of spermatogonia in mice

Project description:Proteasomes undergo dynamic changes in their types and activities during mammalian spermatogenesis. While the spermatogenesis-specific 20S proteasome (s20S), characterized by PSMA8 substitution of PSMA7, is known to be essential for meiosis I completion, the functions of the constitutive PSMA7-containing 20S proteasomes (c20S) in spermatogenesis remain poorly understood. Here, we show that c20S proteasomes are required for the maintenance and differentiation of spermatogonia. PSMA7 is ubiquitously expressed in male germ cells beginning at the early spermatogonial stage, preceding PSMA8 expression. Conditional ablation of Psma7 using Stra8-Cre impairs proteasomal degradation in differentiating spermatogonia, leading to male infertility. Single-cell RNA sequencing analysis reveals that PSMA7-deleted germ cells are arrested at the differentiating spermatogonia stage and fail to enter meiosis. Notably, sufficient overexpression of PSMA8 restores normal spermatogenesis in Psma7-null germ cells, suggesting a potential complementarity of s20S to c20S. Therefore, our results add critical insights into the complex regulation of proteasomal degradation during spermatogenesis.

2025-05-20 | GSE296214 | GEO

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