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Lee BE, Kim HY, Kim HJ, Jeong H, Kim BG, Lee HE, Lee J, Kim HB, Lee SE, Yang YR, Yi EC, Hanover JA, Myung K, Suh PG, Kwon T, Kim JI. O-GlcNAcylation regulates dopamine neuron function, survival and degeneration in Parkinson disease. Brain : a journal of neurology 2020 143(12) 33300544
Abstract:
The dopamine system in the midbrain is essential for volitional movement, action selection, and reward-related learning. Despite its versatile roles, it contains only a small set of neurons in the brainstem. These dopamine neurons are especially susceptible to Parkinson's disease and prematurely degenerate in the course of disease progression, while the discovery of new therapeutic interventions has been disappointingly unsuccessful. Here, we show that O-GlcNAcylation, an essential post-translational modification in various types of cells, is critical for the physiological function and survival of dopamine neurons. Bidirectional modulation of O-GlcNAcylation importantly regulates dopamine neurons at the molecular, synaptic, cellular, and behavioural levels. Remarkably, genetic and pharmacological upregulation of O-GlcNAcylation mitigates neurodegeneration, synaptic impairments, and motor deficits in an animal model of Parkinson's disease. These findings provide insights into the functional importance of O-GlcNAcylation in the dopamine system, which may be utilized to protect dopamine neurons against Parkinson's disease pathology.
O-GlcNAc proteins:
BIG2, F1712, VIR, AJM1, RPGP1, UBR4, SCN1A, AGRIN, TITIN, KALRN, STPG3, FXL16, TT23L, PTPRS, GRIK3, SCN2A, DLGP4, OSBL8, PTPRZ, PGBD5, GLSK, GCN1, CE350, PI4KA, RYR2, AGRF2, UBE4A, NRX2A, FRY, SYGP1, OTOGL, AT2B1, ANK3, CA2D1, DPYL2, STXB1, DCTN1, U5S1, GFRA2, GALT1, SEM4D, KIF3C, PLCA, PHB2, NCAM2, GRAK, PURB, IMA3, IMA7, PLD3, FOLH1, FKBP8, STX1A, PSDE, VIAAT, AP1B1, C1QBP, SYT3, HNRH1, SATT, CTND2, SDC4, AP3D1, RGS9, RGS7, CSK22, OX2G, AAKG1, CRYM, PROM1, CNTP1, ENTP2, BCKD, SNG1, NIPS1, NIPS2, SEPT7, AT2A2, DHX9, PI51C, PI42A, ITB5, GPX4, NPTX2, GNAZ, WDR1, S4A4, MTX2, CNTFR, ZFR, CSN3, HCN2, HCN1, CTBP1, BSN, MPP3, NOE1, CBPD, LGMN, COR1A, CYB, COX1, COX2, COX3, HPRT, ATP6, THY1, H3C, LAMC1, NU1M, NU2M, NU4M, NU5M, ATP8, GFAP, MBP, PRIO, ALDOA, KAPCA, AATM, TBA1B, TBA3, KIT, LDHA, G6PI, MDR1B, ENPP1, HS90A, ENPL, KCC4, NFL, NFM, RASN, PGK2, ITB1, PPBT, NUCL, PGK1, ACE, LRC4B, UBB, UBC, EF1A1, IF4A2, GSTM1, 4F2, H10, LAMP1, HS90B, L1CAM, ITA5, KCC2A, ITB2, ITPR1, TCPA, PFKAL, CNTN1, NCAM1, AT1B1, C1QB, RS16, RL7, AT1B2, PSMD3, MAP1B, GLNA, CADH2, INSR, NTRK2, KCNC1, SPTB1, H12, KPCE, LDHB, CN37, DDX3L, KCNA1, KCNA3, AMPE, ASSY, SPTN1, G3P, LAMP2, ENOA, AP2A1, AP2A2, HXK1, GTR1, PTPRA, COF1, GNAO, FAS, LAMA1, NFH, COX41, BIP, HEXB, VIME, MTAP2, MAG, GNA11, GNAQ, MDR1A, ACES, GBRG2, AP1G1, GBRD, EIF3A, CXA1, GRIA1, GRIA2, TY3H, RS2, GBRA2, RL3, BRAF, KCC2B, NP1L1, NCKP1, SNAB, KIF2A, KIF3A, PABP1, GBB4, KCRU, GNA14, KAP3, SC6A1, S6A11, MP2K1, GTR3, LA, RASK, SYWC, KIF1A, HYES, RAB3D, RAB5C, RAB6A, RAB21, NMDZ1, ODPA, RET, FBRL, KCNJ2, CD81, GPM6A, GPM6B, GNL1, DYN1, DYN2, GRIK2, CAP1, ABCA2, PURA, HD, EAA2, H14, H15, H13, ITAV, SYT1, NSF, RB11B, AINX, MYO1B, NEDD4, ALDH2, GRM8, CAZA2, CAPZB, MP2K4, PFKAM, RL6, RL29, RL5, GLRB, DCE1, DCE2, CBR1, GSTM5, ADT1, INPP, CDK5, SAHH, GDIA, VATA, VATE1, GBRB1, RAB7A, ACADL, VA0D1, ADT2, EAA3, KCNJ4, KPYM, RAB2A, PRS6B, PTN5, NCAN, ABCD3, RAB8A, ATPK, ATP5E, UBP5, ATPB, CTBP2, EAA1, WFS1, FUS, NICA, ACTN4, ASM3B, EF2, OPA1, DOCK4, IRPL1, ARPC4, MYPR, PLPP, ACTB, MDGA2, NEUG, RAC3, IF4A1, MEGF8, RAB5B, RAB10, RAB8B, ARP2, ACTZ, CSN2, ARF3, ARL1, CAH10, RAP2B, STX1B, RAB6B, RL27, ARF4, GABT, HNRPK, 1433G, RS7, PP1A, RS8, SMD1, KCAB2, ABI2, RB11A, EF1A2, RS4X, PP2AB, RL18A, ACTA, AP2S1, RL23A, VISL1, H4, GBRA1, VATB2, RAB1A, RAB3C, RAN, RAP1A, RS24, GBB1, GBB2, RS3, RL8, RS27A, RL40, RAC1, RAB3A, HSP7C, CH60, VAMP2, NOE3, GBRB3, VATL, PP1G, 1433Z, GBRB2, KCNA2, KCAB1, CRNL1, DYL1, ACTG, ACTH, KPCG, PP2BA, PP2AA, PHB, CSK2B, ACTC, RACK1, ACTS, KAPCB, TBA4A, TBA1A, TBB4B, KPCB, H31, IMB1, PLXA1, PLXA2, PLXA3, DCC, ITPR3, NCHL1, HNRH2, ELAV1, USP9X, IDHG1, LYAG, AT8A1, TCPH, TCPB, TCPD, TCPE, TCPZ, TCPG, TNIK, WNK1, RL36A, ARF1, ARF5, AP2M1, H32, H33, ADCY5, NPTN, RS3A, AT1B3, DPYL1, ZNT3, GRM1, SHPS1, NEO1, FUMH, M4K4, C1QA, TBB5, PDE4D, PDE1B, NMDE2, SC23A, TERA, C1QC, CTNB1, PLAK, EPHA4, MARK3, ATPA, CHLE, KCND1, KCRB, NF1, CDK18, RAC2, MARK2, PGBM, PTPRG, PYC, KCMA1, PADI2, INF2, TRIO, MDGA1, CTP5A, ITB8, PSA, GRM2, PTCD3, PHAR1, LRFN1, SPP2B, HP1B3, NLRX1, PRC2C, TM38A, VGLU1, BIG3, PLXD1, AGAP2, AAK1, TEN4, CAMKV, DOP2, RMD3, SMU1, MCCB, GPD1L, LIGO2, SRBS2, CDKL5, K22O, VPS51, GRM5, CBAR2, SHAN3, UN13A, SE6L2, KCTD8, KCD16, LRC8B, VP13A, C2C4C, S2551, MRS2, DIRA2, CYFP2, TM1L2, RHG44, MYO1D, RABL6, DJC11, UIMC1, ICAM5, FLOT2, HNRPD, PTPRN, CSK21, KHDR1, IGF1R, CLD11, SPB6, ARHG2, VDAC2, VDAC3, VDAC1, ABCB7, ASTN1, P3C2A, CAC1E, LAMB2, CTNA2, SC6A3, CNTN2, PGCB, NEP, KCNA4, CD166, 5NTD, GSLG1, EWS, AP180, FSCN1, GDIB, GRIK5, GRID1, DDX5, HS105, ITIH3, IL1AP, CD47, KINH, KIF3B, LASP1, MYH10, MOG, NPM, PCBP2, CSPG2, DDX3Y, DLG4, RHOC, DAG1, DDX3X, SYPH, TICN1, NDUA4, NPTX1, NUP62, OMGP, HECAM, AOFA, ARP3B, SURF4, SYN2, CP3AD, H2B1H, GLPK, SDC3, GPDM, H2A2C, H2B2B, GRM7, GRM4, CLH1, K1549, GIT1, PKP4, PPR29, CNTN4, NLGN2, SV2C, THS7A, CE170, UBP7, BRNP2, SCMC3, LIGO3, DGKB, RPRD2, DPP10, S23IP, PPRC1, 2ABA, TNPO3, SIK3, U520, S39AA, TTYH3, XPO1, SPCS, KCRS, CSKI1, NRX3A, BCR, SARM1, PRRT3, TEFF1, RAB35, CA2D2, KCC2D, AT1A3, AT1A2, GNAS1, SDK2, WDFY3, NTRK3, RAD9B, DGLA, KCD12, MTMR5, UBE2O, CAND1, UBP34, RS9, 2ABB, H2B1C, TLN2, CSPG5, 2AAA, NP1L4, MTCH2, OPALI, CYFP1, TBB2A, HUWE1, IGS21, ROBO2, ACTN1, IGSF1, TR143, TPPP, OTUB1, KPBB, PP6R1, MAP6, ELP1, RRAGD, MRCKB, GABR2, CSMD3, EPT1, VAT1L, LRRC7, CAPS1, CYLD, AGRL1, AGRL3, CLAP1, AUXI, DAAM2, MADD, MFN2, NU214, UBE3C, PLXA4, FBX2, KCMF1, CBPM, GSTM7, AGFG2, LRC8A, HPLN4, VAC14, UBP2L, C2C2L, LRRT4, BDH, MK15, CNKR2, TENA, ASTN2, NEGR1, RAP2A, THEM6, SLIK5, SLIK4, SLIK3, SLIK2, NFASC, NRCAM, RHG32, SRGP3, EFTU, VGLU3, ERLN2, ROA3, SV2B, MIRO1, EFR3A, LRRT2, U2AF4, ENPP6, SYAC, FLRT3, CBLN2, LRTM2, HPCL4, COR2B, CMC1, ATLA1, NU107, RB39B, RB39A, ZN526, ANS1B, DLGP2, AHSA1, IPO5, NCEH1, LSAMP, CADM2, NOE2, ODP2, RBGPR, ECHA, SPA2L, SYNC, RL24, DAAM1, DMXL2, RLGPB, CLAP2, VMAT2, ARF2, NDRG4, ENPP4, HSDL1, RAP2C, GEPH, VATH, PMGT2, TTC12, AOFB, LRFN5, PIGT, CTL2, TENR, NLGN3, LRRT3, DYN3, LRC4C, ARHGA, SYFA, SI1L1, LCAP, EXOG, CERS6, SEP11, IKZF4, GP158, CWC22, VPS52, SCAI, ANK2, PDE10, PGM2L, SHFL, MIC60, WDR37, ABI1, SYNPO, T132C, GLT13, NED4L, RPB2, TCRG1, GNAL, H2B1K, H2B1P, H2A1F, H2A1H, H2A1K, OGT1, SYNJ1, SEPT8, MBOA7, PGP, NGEF, PYGB, COPA, MARK4, DOCK3, PLXB1, TXTP, AGRL2, TRHDE, R4RL1, RTN1, HS12A, K319L, DNM1L, AGRG1, PACS1, ABCF3, SDHA, HACD3, AGFG1, PAF1, IPO11, CCM2, MATR3, ATAT, LRRT1, LGI3, RPTOR, COL12, NAC2, THIL, EIF3L, MARE2, HNRPL, K0513, IQEC1, CACB4, SCPDL, BPHL, SNG3, EIF3C, H2AJ, DC1L1, S35A3, AP3M2, MUC18, UBQL1, PSPC1, NUP58, IGSF8, EXOC1, CACB1, CADM4, NUP85, SNP47, ACTY, WASF1, AMPB, MICU1, PSMD2, AT1A1, CDIPT, GD1L1, CC50A, HNRPU, REM2, MPCP, MARK1, CSPG4, SORC3, IPO4, SFPQ, BACH, S12A5, RAB14, SFXN3, ACLY, NDUS1, ITM2C, RMXL1, MIC25, ATPG, DDX1, MLP3A, UBAP2, ACSL6, NDUS2, ERLN1, DLG2, PI42C, IPO9, NDUV1, GRHPR, SRGP2, SRGP1, RAB4B, LRP1, WDR7, BRNP1, SYDC, TBB6, PDK3, TSN2, PDE2A, RPAB3, CSMD1, KCC2G, 2ABD, ATAD3, SFXN5, MYO5A, G37L1, RAP1B, SFXN1, NLGN1, NONO, RRAGC, TIP, MLF2, GAK, CDS2, NDUAA, ETFA, TNPO2, PTPRT, DNJA3, T121B, SF3B1, RIMS1, CNTP4, NTRI, PRP8, COX6C, MGST3, CNTP2, 6PGL, QCR8, NDUB4, RAB5A, GLRX3, AT5F1, S2546, MLP3B, 1433B, RL14, M2OM, UCRI, MIC19, PRPS2, NRX1A, MICU3, ARPC2, TBB2B, ROA0, CENPV, RL11, ILF2, TECR, RN181, BIEA, QCR1, OLA1, RL15, AL1B1, TOM70, MPC2, ODPB, MMS19, MGRN1, HNRPM, SCOT1, DYL2, RM28, RAB1B, LIGO1, RUFY3, MEII1, ATAD1, CUL5, GBRA4, TBB4A, GHC1, IDH3A, PRPS1, U2AF1, RL4, PSD12, SNAA, ATPO, BTBDH, QCR2, ALG2, AP2B1, RPN2, SUSD2, NDUA9, NDUS7, 6PGD, EIF3F, NDUS3, RAB13, XPO7, IPO7, NBEA, SORC2, VPS35, RPGF4, TBB3, XPO2, RTN3, LRBA, SPN90, TRIM2, DYHC1, LRP1B, LGI1, PRAF2, SV2A, SCAM5, NECT1, HYOU1, EXTL1, SORC1, DCLK1, MTOR, MINK1, ZN207, AP3B2, MY18A, RHOA, HPLN1, FAK2, NAGAB, COPG2, KI21A, SHRM3, PLEC, DREB, CMC2, EHD3, PLXB3, ADDA, DNJA2, GRM3, PCLO, SIA7A, ARP10, DCTN5, PLXC1, COPG1, GPC1, UBQL2, FBX6, SRR, AT2B2, CELR2, DEST, ARC1A, KAD1, GBRG1, GUAD, CBLN1, DGKE, VAS1, ADA22, ADA23, PEPL, CAD13, TEN1, TEN2, CUL1, ATRN, GLPK2, PDC6I, PFKAP, PYGM, SUCA, RBMX, GABR1, GSK3B, FPRP, E41L3, BUB3, CARM1, PSD13, CP46A, APC7, NCDN, ITB6, KCND2, NU160, HNRDL, SAE2, VATC1, VPP1, ARI1, CA2D3, SEPT3, AP3B1, STK39, HNRPC, DPP6, E41L1, SUCB1, SEPT5, GRIA4, GRIA3, HOME1
Species: Mus musculus
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Wu JL, Chiang MF, Hsu PH, Tsai DY, Hung KH, Wang YH, Angata T, Lin KI. O-GlcNAcylation is required for B cell homeostasis and antibody responses. Nature communications 2017 8(1) 29187734
Abstract:
O-linked N-acetylglucosamine (O-GlcNAc) transferase (Ogt) catalyzes O-GlcNAc modification. O-GlcNAcylation is increased after cross-linking of the B-cell receptor (BCR), but the physiological function of this reaction is unknown. Here we show that lack of Ogt in B-cell development not only causes severe defects in the activation of BCR signaling, but also perturbs B-cell homeostasis by enhancing apoptosis of mature B cells, partly as a result of impaired response to B-cell activating factor. O-GlcNAcylation of Lyn at serine 19 is crucial for efficient Lyn activation and Syk interaction in BCR-mediated B-cell activation and expansion. Ogt deficiency in germinal center (GC) B cells also results in enhanced apoptosis of GC B cells and memory B cells in an immune response, consequently causing a reduction of antibody levels. Together, these results demonstrate that B cells rely on O-GlcNAcylation to maintain homeostasis, transduce BCR-mediated activation signals and activate humoral immunity.
O-GlcNAc proteins:
FAIM3, K1109, BCORL, M3K15, KANL3, EXC6B, PLHD1, CTTB2, MYO1E, SCLT1, TAF4B, TCOF, FLOT1, OXLA, HDAC1, SYPL1, SEM4D, MA2B1, PPE2, PLD3, DPOD2, NOCT, HNRH1, API5, DFFA, DHX9, MMP8, DPM1, EIF3D, ESS2, CTNL1, VTI1B, S28A2, FA5, CO4B, IGKC, LAC1, IGHA, IGHDM, HA11, LAMC1, TBA1B, LDHA, HVM51, SPTA1, ZFP1, EGR1, ENPL, RPB1, ITB1, ENV1, 4F2, HS90B, HA2B, HB2A, CD44, BLK, CN37, LAMP2, ZFP37, PTBP1, HB2I, BASI, FAS, EVI2A, MDR1A, BGAL, ITAL, LYN, TLN1, MOES, U2AF2, MAP4, GNA13, RL3, CATG, DPP4, PTN6, HEXA, NKTR, HMGB2, SUH, CEAM1, GTR3, DRG1, RAB5C, CD22, FMR1, VGFR1, GRP75, CAP1, ECI1, FOXK1, STAT1, NKX25, TCPQ, H11, H13, IL12B, CAPZB, RL5, VDR, RET3, ADCY7, VA0D1, AAAT, IMA1, STOM, FUS, NICA, RU2A, EF2, AAAS, RUVB1, ABCE1, DCAF7, HNRPK, 1433G, ACTA, RS6, VATB2, RL23, RL8, PP2BA, RACK1, TBB4B, M4K1, ITPR3, SURF6, ELAV1, EVL, H2B1A, AT8A1, TCPH, TCPB, NXN, TBB5, HNRL2, CREB1, PLAK, 3MG, CO6A1, LG3BP, COE1, CNN2, NSUN2, HMHA1, SNUT2, SMCA4, TPC10, TGRM2, I20L2, LMF1, PUF60, ZSWM8, PRRC1, SC31A, CPZIP, ITAD, ULK4, ITA1, DYHC2, LIN54, JKIP3, GRHL3, MYO1G, SIN3A, IRAG2, SAMH1, KHDR1, LY75, RASA3, NPT2A, CAPR1, ARHG2, PML, IMA5, LAP2B, PRP4B, M4K2, TS101, ARHG1, PLSL, CTNA2, VSX2, CD37, SERA, PCBP2, TIF1B, COCH, NUP62, RALY, UT14A, ARG39, CLH1, ATS16, F120A, NOP58, TEDC2, U520, RRP12, SMHD1, ANO6, TTBK1, CHD4, SARM1, NUP98, RASL2, TNKS1, AT1A2, NFRKB, DDX55, DNA2, H2B1C, CMYA5, GIMA8, CYFP1, SPAG5, HNRPQ, RPF1, MBB1A, PRC2A, ADCY2, MOGS, SDA1, FA98B, WIPI2, TRRAP, XYLT1, WDR82, GNS, ERLN2, S38A9, WASF2, CMC1, NIM1, TBL1R, ZN526, CARF, HES7, UNC80, RBGPR, ECHA, ELMO1, F214B, KMT2C, FLNA, TPC2, RBBP5, POGZ, DOC10, SYFA, SMKZ, COR2A, RBM14, DOCK2, CASP9, RAE1L, NUP88, RPB2, UACA, SYEP, P66A, VPS50, COPA, VWF, TXTP, ZN536, LMBD1, R4RL1, C2D1A, URP2, STX5, GT251, SDHA, PO121, ABLM1, COL12, ALAT1, RORB, PDLI2, ERO1B, CD177, PSPC1, NUP58, STAB2, LRC8C, COX18, MAVS, PLBL1, UN93B, EVI2B, MYH9, ESIP1, VIGLN, PSMD2, HNRL1, CCAR2, SP7, RECQ5, SFXN3, IF4A3, RINI, DDX1, UBAP2, S15A4, DNJC9, MASP2, UXS1, CSCL1, BMP2K, CYRIB, SYDC, C1TC, GLYR1, PDIA6, CIC, S12A6, ATAD3, MYO5A, MCLN1, ABEC3, STML2, SFXN1, PRP19, TARA, MCRS1, RTCB, NDUS5, S12A9, SF3B1, ANR17, NU155, TR34A, BAP1, PRP8, NUDC2, TSN31, RN138, RTRAF, RU2B, YETS4, M2OM, MIC19, SNX2, DDX28, CXXC1, RUSD4, ILF2, CHTOP, LUC7L, DIM1, MCES, SEC13, SP2, NOP56, U2AF1, EF1G, MCEM1, EVPL, PRP4, CMTR1, WWP2, DHB11, PESC, TLR9, IRX6, KRT81, RBP2, AFF4, KAT2B, STK3, NUP50, DDX21, ACINU, SIGIR, ZN207, SLAF1, SON, H2AY, MTA2, SAE1, MYO1C, RUVB2, TRPV2, PFKAP, ARC1B, ASAH1, VAPA, EHD1, IF2G, CLIC1, HNRPC, HNRPF
Species: Mus musculus
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Zhu Y, Liu TW, Madden Z, Yuzwa SA, Murray K, Cecioni S, Zachara N, Vocadlo DJ. Post-translational O-GlcNAcylation is essential for nuclear pore integrity and maintenance of the pore selectivity filter. Journal of molecular cell biology 2016 8(1) 26031751
Abstract:
O-glycosylation of the nuclear pore complex (NPC) by O-linked N-acetylglucosamine (O-GlcNAc) is conserved within metazoans. Many nucleoporins (Nups) comprising the NPC are constitutively O-GlcNAcylated, but the functional role of this modification remains enigmatic. We show that loss of O-GlcNAc, induced by either inhibition of O-GlcNAc transferase (OGT) or deletion of the gene encoding OGT, leads to decreased cellular levels of a number of natively O-GlcNAcylated Nups. Loss of O-GlcNAc enables increased ubiquitination of these Nups and their increased proteasomal degradation. The decreased half-life of these deglycosylated Nups manifests in their gradual loss from the NPC and a downstream malfunction of the nuclear pore selective permeability barrier in both dividing and post-mitotic cells. These findings define a critical role of O-GlcNAc modification of the NPC in maintaining its composition and the function of the selectivity filter. The results implicate NPC glycosylation as a regulator of NPC function and reveal the role of conserved glycosylation of the NPC among metazoans.
O-GlcNAc proteins:
NUP62
Species: Mus musculus
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Ji S, Kang JG, Park SY, Lee J, Oh YJ, Cho JW. O-GlcNAcylation of tubulin inhibits its polymerization. Amino acids 2011 40(3) 20665223
Abstract:
The attachment of O-linked β-N-acetylglucosamine (O-GlcNAc) to proteins is an abundant and reversible modification that involves many cellular processes including transcription, translation, cell proliferation, apoptosis, and signal transduction. Here, we found that the O-GlcNAc modification pattern was altered during all-trans retinoic acid (tRA)-induced neurite outgrowth in the MN9D neuronal cell line. We identified several O-GlcNAcylated proteins using mass spectrometric analysis, including α- and β-tubulin. Further analysis of α- and β-tubulin revealed that O-GlcNAcylated peptides mapped between residues 173 and 185 of α-tubulin and between residues 216 and 238 of β-tubulin, respectively. We found that an increase in α-tubulin O-GlcNAcylation reduced heterodimerization and that O-GlcNAcylated tubulin did not polymerize into microtubules. Consequently, when O-GlcNAcase inhibitors were co-incubated with tRA, the extent of neurite outgrowth was decreased by 20% compared to control. Thus, our data indicate that the O-GlcNAcylation of tubulin negatively regulates microtubule formation.
Species: Mus musculus
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Zaro BW, Yang YY, Hang HC, Pratt MR. Chemical reporters for fluorescent detection and identification of O-GlcNAc-modified proteins reveal glycosylation of the ubiquitin ligase NEDD4-1. Proceedings of the National Academy of Sciences of the United States of America 2011 108(20) 21540332
Abstract:
The dynamic modification of nuclear and cytoplasmic proteins by the monosaccharide N-acetyl-glucosamine (GlcNAc) continues to emerge as an important regulator of many biological processes. Herein we describe the development of an alkynyl-modified GlcNAc analog (GlcNAlk) as a new chemical reporter of O-GlcNAc modification in living cells. This strategy is based on metabolic incorporation of reactive functionality into the GlcNAc biosynthetic pathway. When combined with the Cu(I)-catalyzed [3 + 2] azide-alkyne cycloaddition, this chemical reporter allowed for the robust in-gel fluorescent visualization of O-GlcNAc and affinity enrichment and identification of O-GlcNAc-modified proteins. Using in-gel fluorescence detection, we characterized the metabolic fates of GlcNAlk and the previously reported azido analog, GlcNAz. We confirmed previous results that GlcNAz can be metabolically interconverted to GalNAz, whereas GlcNAlk does not, thereby yielding a more specific metabolic reporter of O-GlcNAc modification. We also used GlcNAlk, in combination with a biotin affinity tag, to identify 374 proteins, 279 of which were not previously reported, and we subsequently confirmed the enrichment of three previously uncharacterized proteins. Finally we confirmed the O-GlcNAc modification of the ubiquitin ligase NEDD4-1, the first reported glycosylation of this protein.
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