0000000000535435

AUTHOR

Boaz Tirosh

showing 2 related works from this author

SUMOylation of Blimp-1 promotes its proteasomal degradation

2011

Abstract B lymphocyte induced maturation protein-1 (Blimp-1) is a transcription repressor of the Krueppel-like family. Blimp-1 plays important roles in developmental processes, such as of germ cells and hair follicle stem cells. In B lymphocytes Blimp-1 orchestrates the terminal differentiation into plasma cells. We discovered that Blimp-1 undergoes SUMOylation by SUMO-1. This SUMOylation is modulated by the SUMO protease SENP1. While Blimp-1 is relatively stable in 293T cells, a fusion with SUMO1 rendered it to rapid proteasomal degradation. Increase in SENP1 activity stabilized Blimp-1, while a decrease promoted its degradation. Our data indicate that SUMOylation of Blimp-1 regulates its …

Proteasome Endopeptidase ComplexSENP1ImmunoprecipitationSUMO-1 ProteinBiophysicsSUMO proteinPlasma cellPlasma cellBiologyBiochemistryCell LineProtein–protein interactionSENP1Structural BiologyEndopeptidasesGeneticsmedicineHumansMolecular BiologyProteasomeProtein StabilityHEK 293 cellsSumoylationCell BiologyCell biologyRepressor ProteinsCysteine Endopeptidasesmedicine.anatomical_structureProteasomeSUMO proteasePositive Regulatory Domain I-Binding Factor 1IntracellularFEBS Letters
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mTORC1 activation in B cells confers impairment of marginal zone microarchitecture by exaggerating cathepsin activity

2018

Mammalian target of rapamycin complex 1 (mTORC1) is a key regulator of cell metabolism and lymphocyte proliferation. It is inhibited by the tuberous sclerosis complex (TSC), a heterodimer of TSC1 and TSC2. Deletion of either gene results in robust activation of mTORC1. Mature B cells reside in the spleen at two major anatomical locations, the marginal zone (MZ) and follicles. The MZ constitutes the first line of humoral response against blood‐borne pathogens and undergoes atrophy in chronic inflammation. In previous work, we showed that mice deleted for TSC1 in their B cells (TSC1(BKO)) have almost no MZ B cells, whereas follicular B cells are minimally affected. To explore potential underl…

Lymphotoxin-beta0301 basic medicinecongenital hereditary and neonatal diseases and abnormalitiesImmunologyMice TransgenicSpleenCHO CellsmTORC1Lymphocyte proliferationMechanistic Target of Rapamycin Complex 1Tuberous Sclerosis Complex 1 ProteinCathepsin BCell LineMice03 medical and health sciencesCricetulus0302 clinical medicineLymphotoxin beta ReceptorTuberous Sclerosis Complex 2 ProteinmedicineAnimalsImmunology and AllergyReceptorLymphotoxin-alphaSirolimusCathepsinB-LymphocytesChemistryOriginal ArticlesMarginal zoneCathepsinsCell biology030104 developmental biologymedicine.anatomical_structureLymphotoxinSpleen030215 immunologyImmunology
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