References in the O-GlcNAc Database

Pirro M, Mohammed Y, de Ru AH, Janssen GMC, Tjokrodirijo RTN, Madunić K, Wuhrer M, van Veelen PA, Hensbergen PJ. Oxonium Ion Guided Analysis of Quantitative Proteomics Data Reveals Site-Specific O-Glycosylation of Anterior Gradient Protein 2 (AGR2). International journal of molecular sciences 2021 22(10) 34065225

Abstract:
Developments in mass spectrometry (MS)-based analyses of glycoproteins have been important to study changes in glycosylation related to disease. Recently, the characteristic pattern of oxonium ions in glycopeptide fragmentation spectra had been used to assign different sets of glycopeptides. In particular, this was helpful to discriminate between O-GalNAc and O-GlcNAc. Here, we thought to investigate how such information can be used to examine quantitative proteomics data. For this purpose, we used tandem mass tag (TMT)-labeled samples from total cell lysates and secreted proteins from three different colorectal cancer cell lines. Following automated glycopeptide assignment (Byonic) and evaluation of the presence and relative intensity of oxonium ions, we observed that, in particular, the ratio of the ions at m/z 144.066 and 138.055, respectively, could be used to discriminate between O-GlcNAcylated and O-GalNAcylated peptides, with concomitant relative quantification between the different cell lines. Among the O-GalNAcylated proteins, we also observed anterior gradient protein 2 (AGR2), a protein which glycosylation site and status was hitherto not well documented. Using a combination of multiple fragmentation methods, we then not only assigned the site of modification, but also showed different glycosylation between intracellular (ER-resident) and secreted AGR2. Overall, our study shows the potential of broad application of the use of the relative intensities of oxonium ions for the confident assignment of glycopeptides, even in complex proteomics datasets.

O-GlcNAc proteins:
OGA, LMNA, MAP4, BPTF, FIP1, RORB, PDLI5

Species: Homo sapiens

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Levine ZG, Fan C, Melicher MS, Orman M, Benjamin T, Walker S. O-GlcNAc Transferase Recognizes Protein Substrates Using an Asparagine Ladder in the Tetratricopeptide Repeat (TPR) Superhelix. Journal of the American Chemical Society 2018 140(10) 29485866

Abstract:
The essential mammalian enzyme O-GlcNAc Transferase (OGT) is uniquely responsible for transferring N-acetylglucosamine to over a thousand nuclear and cytoplasmic proteins, yet there is no known consensus sequence and it remains unclear how OGT recognizes its substrates. To address this question, we developed a protein microarray assay that chemoenzymatically labels de novo sites of glycosylation with biotin, allowing us to simultaneously assess OGT activity across >6000 human proteins. With this assay we examined the contribution to substrate selection of a conserved asparagine ladder within the lumen of OGT's superhelical tetratricopeptide repeat (TPR) domain. When five asparagines were mutated, OGT retained significant activity against short peptides, but showed limited limited glycosylation of protein substrates on the microarray. O-GlcNAcylation of protein substrates in cell extracts was also greatly attenuated. We conclude that OGT recognizes the majority of its substrates by binding them to the asparagine ladder in the TPR lumen proximal to the catalytic domain.

O-GlcNAc proteins:
E2F8, PRXD1, TSPY2, CGB1, ZN839, CENPX, PDLI1, WWP2, FOXN3, IMA4, DPYL4, ABLM1, MEIS2, HGS, GAK, PLS1, MAGB4, ARPC5, DC1L2, FGF16, WIPF1, FRS3, RNF13, ZN207, ENSA, SMCA5, CE104, OGA, AP180, PQBP1, E2F6, ADAP1, DNJC8, FLOT1, TPPP, SCEL, CELF2, RPGF3, CLD14, KLF8, BAG3, PAK4, IGHG3, MBP, NFIC, SNRPA, CEL3A, RU1C, IGLC1, MTAP2, ERG, DMD, IRF2, ENPL, FOSL2, F261, SDC1, ATF1, ATF3, ELK1, TFEB, RXRA, COMT, USF1, FGFR3, NR4A1, THAS, MARK3, ARNT, PSB4, RBMS1, FCERG, MPIP1, CSTF2, CD68, BMI1, COPB2, SOX5, RS19, ARL4A, ETV5, IPP2, STAT6, ABL2, KSYK, TFPI2, RFX5, RXRG, CDK8, GSK3B, TAF6, SPS1, DNLI3, DYN2, GALK1, AGFG1, SC24C, DLX1, HDAC4, CTBP2, KLF3, TIRAP, PPIA, CSK21, 3BP2, SSBP2, CDKL1, BORG5, TFAP4, ROR2, CACB1, CREM, MECOM, TLE4, FAK1, COEA1, MTG8, GABPA, GABP1, DERM, TLE5, DEMA, ASPH, PP1R8, LCP2, DUS4, MTAP, EI2BE, G3BP1, GRB10, MTA1, PPIL2, PICAL, DYR1A, FHL3, NCOA4, CAYP1, CIRBP, DGCR6, VGLL4, CAPR1, GRB7, CASL, MEF2D, LASP1, SPCS2, SEPT2, PCM1, SIX1, SF01, TRIP6, RHOH, TAB1, ADRM1, CCDC6, BATF, NFE2, MAR1, NRF1, SMTL2, LETM2, OD3L2, AX2R, AMOT, AKIR2, PRR30, LARGN, RGPS1, PRC2B, TEX30, SNP47, PHYD1, KANK4, EEIG1, CPTP, AHDC1, KHDR2, EF1DL, OLM2B, ANKS6, RHG17, CNDH2, GRHL2, HMBX1, JHY, PP4R4, JMJD6, SCYL2, GOLM2, RSBNL, PSRC1, DRIC1, KCD18, FIP1, SAS6, CLM9, CCBE1, DUSTY, E400N, TM1L2, UBP45, MARK2, KCTD9, MCM10, CC186, POGZ, FLIP1, TAF8, RM55, S1A7A, SYVN1, PHLB1, CASZ1, PIM3, GA2L3, DDX42, CEP57, SPAS2, Z280B, PDPN, KCC1D, TF2LX, LOXH1, ARI3B, APLF, CC28A, RHG12, SKA3, PHC2, HYCC2, CMIP, SMAP1, RUSD2, ABI1, SYCE1, RPTOR, BATF2, S35F6, KLH36, ANS4B, MARHA, ZSCA1, UXS1, NECP1, BBOF1, LIPB2, MISSL, PHC3, TMIE, NUP35, OR4D6, JOS2, WDR48, GABP2, DPTOR, ALAT2, BRSK1, GRP4, HELQ, BL1S5, BCAS4, LMX1A, SSH3, SH3R2, FBF1, DLRB2, HDAC7, STYX, GTSF1, NEUR4, CSRN3, AP2B, SHC3, RORB, STAM1, CELF1, ARHG1, CSN5, RBPMS, ZDH16, PMEPA, UTP4, FERM2, SOSB2, R51A1, CR025, LENG1, BIRC7, PBIR1, CC126, PF21B, NRBF2, EDC3, PDLI5, ANCHR, ZC3HA, PKNX2, EGLN2, MARK4, UB2E2, PRRC1, NOL4L, AP4AT, SCLT1, TOX2, QKI, PNMA5, YPEL2, NUDC1, RB40C, UBL7, CK2N2, OSBL9, PNKP, PLIN2, CDCA3, HCD2, SNAG, ARI3A, DPYL5, CG025, SOSB1, TCF25, COE4, MIC25, UTP23, ALKB7, RBM42, LRRC1, TRMO, MCRI2, RSRP1, BBLN, ASHWN, SARG, NADAP, SSBP3, PLVAP, OSB11, B2L13, STK31, DGC6L, RM01, KLC2, SIK2, REN3A, NELFA, PPDPF, ILRUN, ES8L2, KI3X1, SP14L, B2L12, PKHA3, PKHA1, TAF9B, ARNT2, SYTL2, CIP1, CASS4, HINT3, PRDM5, PAR11, MBNL1, BRWD1, KLC4, TB22B, MBNL3, NFIP2, ZSC32, TMOD3, UGGG2, CWC15, KANL3, RBPJL, DKK4, LIMD1, DPOLL, AFF4, UBQL2, PUF60, BAZ2B, GGA2, ING1, BORG2, AGO2, ZHX1, MUCEN, ANR50, PCDGK, POLI, LIMC1, SMAG1, BAIP2, RPC10, PPIL1, C2CD2, MTL5, TBL2, YTHD2, T10B, SNX14, RT18B, GMEB1, STON1, PCLO, ZHX2, S23IP