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Lopez Aguilar A, Gao Y, Hou X, Lauvau G, Yates JR, Wu P. Profiling of Protein O-GlcNAcylation in Murine CD8+ Effector- and Memory-like T Cells. ACS chemical biology 2017 12(12) 29125738
Abstract:
During an acute infection, antigenic stimulation leads to activation, expansion, and differentiation of naïve CD8+ T cells, first into cytotoxic effector cells and eventually into long-lived memory cells. T cell antigen receptors (TCRs) detect antigens on antigen-presenting cells (APCs) in the form of antigenic peptides bound to major histocompatibility complex I (MHC-I)-encoded molecules and initiate TCR signal transduction network. This process is mediated by phosphorylation of many intracellular signaling proteins. Protein O-GlcNAc modification is another post-translational modification involved in this process, which often has either reciprocal or synergistic roles with phosphorylation. In this study, using a chemoenzymatic glycan labeling technique and proteomics analysis, we compared protein O-GlcNAcylation of murine effector and memory-like CD8+ T cells differentiated in vitro. By quantitative proteomics analysis, we identified 445 proteins that are significantly regulated in either effector- or memory-like T cell subsets. Furthermore, qualitative and quantitative analysis identified highly regulated protein clusters that suggest involvement of this post-translational modification in specific cellular processes. In effector-like T cells, protein O-GlcNAcylation is heavily involved in transcriptional and translational processes that drive fast effector T cells proliferation. During the formation of memory-like T cells, protein O-GlcNAcylation is involved in a more specific, perhaps more targeted regulation of transcription, mRNA processing, and translation. Significantly, O-GlcNAc plays a critical role as part of the "histone code" in both CD8+ T cells subgroups.
Species: Mus musculus
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Alfaro JF, Gong CX, Monroe ME, Aldrich JT, Clauss TR, Purvine SO, Wang Z, Camp DG 2nd, Shabanowitz J, Stanley P, Hart GW, Hunt DF, Yang F, Smith RD. Tandem mass spectrometry identifies many mouse brain O-GlcNAcylated proteins including EGF domain-specific O-GlcNAc transferase targets. Proceedings of the National Academy of Sciences of the United States of America 2012 109(19) 22517741
Abstract:
O-linked N-acetylglucosamine (O-GlcNAc) is a reversible posttranslational modification of Ser and Thr residues on cytosolic and nuclear proteins of higher eukaryotes catalyzed by O-GlcNAc transferase (OGT). O-GlcNAc has recently been found on Notch1 extracellular domain catalyzed by EGF domain-specific OGT. Aberrant O-GlcNAc modification of brain proteins has been linked to Alzheimer's disease (AD). However, understanding specific functions of O-GlcNAcylation in AD has been impeded by the difficulty in characterization of O-GlcNAc sites on proteins. In this study, we modified a chemical/enzymatic photochemical cleavage approach for enriching O-GlcNAcylated peptides in samples containing ∼100 μg of tryptic peptides from mouse cerebrocortical brain tissue. A total of 274 O-GlcNAcylated proteins were identified. Of these, 168 were not previously known to be modified by O-GlcNAc. Overall, 458 O-GlcNAc sites in 195 proteins were identified. Many of the modified residues are either known phosphorylation sites or located proximal to known phosphorylation sites. These findings support the proposed regulatory cross-talk between O-GlcNAcylation and phosphorylation. This study produced the most comprehensive O-GlcNAc proteome of mammalian brain tissue with both protein identification and O-GlcNAc site assignment. Interestingly, we observed O-β-GlcNAc on EGF-like repeats in the extracellular domains of five membrane proteins, expanding the evidence for extracellular O-GlcNAcylation by the EGF domain-specific OGT. We also report a GlcNAc-β-1,3-Fuc-α-1-O-Thr modification on the EGF-like repeat of the versican core protein, a proposed substrate of Fringe β-1,3-N-acetylglucosaminyltransferases.
O-GlcNAc proteins:
ZEP3, CAMP1, FRPD1, SKT, DLGP4, DPYL2, STXB1, MAP2, NUMBL, M3K5, NOTC2, CTND2, CSK22, ACK1, SYUA, ATX2, ZFR, BSN, GCR, EGR1, NFL, NFM, RC3H2, MAMD1, ATX1L, DERPC, NCAM1, MAP1B, G3P, ATF2, MAP4, KCC2B, AIMP1, FOXK1, STAT3, AINX, NEDD4, RP3A, DVL1, GOGA3, FOXP1, TB182, GMEB2, PI5PA, MRTFB, DOCK4, ABI2, KCNJ3, NCOA1, RGRF2, TNIK, WNK1, G3BP2, MPRIP, XRN1, RLA2, S30BP, NFIA, MARK3, ENAH, PGBM, CDK12, MA6D1, PHAR1, PSD3, NELL1, PRC2C, YETS2, FOXK2, WNK2, LIMC1, TNR6C, AGAP2, ZEP2, AAK1, TNR6A, CAMKV, PKHA7, GRIN1, FCHO2, GARL3, STOX2, UBN1, ABL2, CDV3, PHAR4, TAB3, NUFP2, UNKL, OSBP2, RBM27, CYFP2, TM1L2, ANR40, NACAD, SIN3A, NCOR1, LAMA5, NCOA2, AP180, RAI1, M3K7, TAF6, SRBS1, SH3G1, TLE4, MINT, ZYX, SF01, SYN2, TBR1, SBNO1, CRTC1, GIT1, SLAI1, PKP4, CDK13, RHG23, SH3R1, JHD2C, HECD1, ABLM3, ARMX2, LAR4B, RHG21, FBX41, RPRD2, WWC2, ZN532, BCR, DLGP3, NYAP1, GMIP, NFRKB, MAGI1, CNOT1, NU188, PICAL, SMAP2, SPAG7, PRC2B, ATX2L, MAP6, MCAF1, PHF24, NAV3, AUXI, RERE, RIMB2, PUM1, NU214, KCMF1, EPN1, AGFG2, UBP2L, C2C2L, CNKR2, ZN598, SHAN2, MAST4, RHG32, MYPT2, TB10B, FRM4A, SP130, DLGP2, ZNT6, ABLM2, EMSY, CLAP2, CNOT4, PAMR1, CREST, IFFO1, OSBL6, YTHD3, TM266, SI1L1, SH3R3, RBM14, CNOT2, ANK2, DIDO1, SYNPO, VCIP1, TAB1, SCYL2, ASPP2, F193A, OGT1, NAV1, SYNJ1, RPGF2, EP400, P66A, PDLI5, SCAM1, HS12A, AGFG1, I2BPL, PO121, ABLM1, SPART, RFIP5, CS047, SIR2, AMOT, CCG8, ZCH14, WDR13, UBAP2, NCOA5, FRS3, ZFN2B, BASP1, DCP1A, SRGP2, SRGP1, SYUB, CLIP1, UBXN1, GORS2, EPN4, RB6I2, ANR17, RTN4, TXD12, NECP1, DLGP1, FIP1, F135B, TM263, PLIN3, MYPT1, CRIP2, TSC1, NBEA, RIMS2, ZN704, RBP2, RTN3, 4ET, ELF2, NUDT3, FMN2, NCOA6, SRCN1, ASAP1, RAD1, SON, PLEC, ULK2, ADDA, PCLO, HIPK2, SH2D3, YLPM1, RHG07, TEN1, NCOR2, COR1B, TNIP1, DEMA, E41L3, SYUG, APCL, MECP2, E41L1
Species: Mus musculus
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Myers SA, Panning B, Burlingame AL. Polycomb repressive complex 2 is necessary for the normal site-specific O-GlcNAc distribution in mouse embryonic stem cells. Proceedings of the National Academy of Sciences of the United States of America 2011 108(23) 21606357
Abstract:
The monosaccharide addition of an N-acetylglucosamine to serine and threonine residues of nuclear and cytosolic proteins (O-GlcNAc) is a posttranslational modification emerging as a general regulator of many cellular processes, including signal transduction, cell division, and transcription. The sole mouse O-GlcNAc transferase (OGT) is essential for embryonic development. To understand the role of OGT in mouse development better, we mapped sites of O-GlcNAcylation of nuclear proteins in mouse embryonic stem cells (ESCs). Here, we unambiguously identify over 60 nuclear proteins as O-GlcNAcylated, several of which are crucial for mouse ESC cell maintenance. Furthermore, we extend the connection between OGT and Polycomb group genes from flies to mammals, showing Polycomb repressive complex 2 is necessary to maintain normal levels of OGT and for the correct cellular distribution of O-GlcNAc. Together, these results provide insight into how OGT may regulate transcription in early development, possibly by modifying proteins important to maintain the ESC transcriptional repertoire.
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