REFERENCES


Choose an author or browse all
Choose the species or browse all
Choose a criteria for sorting
 Reverse sorting
Search for a protein
Search for a single PMID
Download references as CSV

Select O-GlcNAc references filter

Click to expand (3 results)

*Color correspond to species


Chuh KN, Batt AR, Zaro BW, Darabedian N, Marotta NP, Brennan CK, Amirhekmat A, Pratt MR. The New Chemical Reporter 6-Alkynyl-6-deoxy-GlcNAc Reveals O-GlcNAc Modification of the Apoptotic Caspases That Can Block the Cleavage/Activation of Caspase-8. Journal of the American Chemical Society 2017 139(23) 28528544
Abstract:
O-GlcNAc modification (O-GlcNAcylation) is required for survival in mammalian cells. Genetic and biochemical experiments have found that increased modification inhibits apoptosis in tissues and cell culture and that lowering O-GlcNAcylation induces cell death. However, the molecular mechanisms by which O-GlcNAcylation might inhibit apoptosis are still being elucidated. Here, we first synthesize a new metabolic chemical reporter, 6-Alkynyl-6-deoxy-GlcNAc (6AlkGlcNAc), for the identification of O-GlcNAc-modified proteins. Subsequent characterization of 6AlkGlcNAc shows that this probe is selectively incorporated into O-GlcNAcylated proteins over cell-surface glycoproteins. Using this probe, we discover that the apoptotic caspases are O-GlcNAcylated, which we confirmed using other techniques, raising the possibility that the modification affects their biochemistry. We then demonstrate that changes in the global levels of O-GlcNAcylation result in a converse change in the kinetics of caspase-8 activation during apoptosis. Finally, we show that caspase-8 is modified at residues that can block its cleavage/activation. Our results provide the first evidence that the caspases may be directly affected by O-GlcNAcylation as a potential antiapoptotic mechanism.
O-GlcNAc proteins:
A2A4A6, A2A5R8, GPTC8, SPD2B, A2ACG7, A2AFQ9, A2AFW6, A2AG46, CKAP5, A2AH75, A2AJ72, MA7D1, A2AL12, A2AMW0, A2AMY5, TPX2, PPIG, LAS1L, A5A4Y9, A6PWC3, A6PWK7, UBP36, B1AT03, B1AT82, B1AU75, B2RQG2, OTUD4, B7ZCP4, B7ZP47, D3YUW8, D3YWF6, D3YWK1, D3YX62, SAFB1, D3YXM7, D3YZ06, D3YZP6, D3Z069, D3Z158, D3Z3F8, D3Z6W2, E0CYM1, E9PUH7, E9PVM7, E9PWG6, E9PWV3, E9PWW9, E9PY48, E9PYT3, E9PZM7, E9Q066, E9Q2X6, NU153, E9Q450, E9Q4K7, E9Q4Q2, KIF23, BD1L1, NUMA1, E9Q7M2, E9Q986, E9Q9E1, E9Q9H2, E9QKG3, E9QKG6, E9QKZ2, E9QLA5, E9QP49, E9QP59, E9QPI5, F2Z3X7, F6S5I0, F7AA26, F7BQE4, FARP1, F8VQ93, F8VQC7, F8VQE9, F8VQK5, F8WI30, G3UZ44, G3UZX6, G3X8R0, G3X8Y3, G3X928, G3X963, G3X972, G3X9V0, G5E896, G5E8E1, H3BJU7, H3BK31, H3BKK2, H7BX26, I1E4X0, I7HIK9, J3QNW0, DPYL2, GTPB1, AKAP1, TCOF, AIP, HDAC1, RL21, GSH0, KIF1C, DHX15, SC6A6, IF6, ILK, ATX2, NMT1, E41L2, DHB12, SRPK1, ZN326, ZFR, PARG, SPD2A, SP1, CASP8, HPRT, LDHA, G6PI, TYSY, RIR1, GNAI2, ITB1, 4F2, H2B1F, MAP1B, HMOX1, LEG1, G3P, KS6A3, COF1, GNAO, IFRD1, VIME, UBL4A, CBX3, CXA1, CATA, IMDH2, IL1RA, MCM3, CDK4, NKTR, FKBP4, CBX2, HMGB2, AIMP1, KAP3, MP2K1, SYWC, KIF4, NEDD1, DPOLA, RANG, UBP4, PTN11, RAB18, PTN1, PTN12, LDLR, DNLI1, CAP1, STAT3, STA5B, PURA, ALD2, RAGP1, NEDD4, STT3A, ALDH2, GSHR, GFPT1, PCY1A, MCM4, ICAL, PLCB3, CDN2A, HDGF, UBP10, KPYM, CCHL, IDHP, DDX6, GOGA3, COX17, ACTN4, GCP3, TB182, EIF3E, ABCE1, PFD3, 1433E, RAP1A, RS25, TCTP, DNJA1, HMGB1, IF5A1, RS17, RS12, UB2L3, HXD13, HDAC2, ELAV1, TP53B, CASP3, PYRG1, TCPB, STIM2, SRSF3, CSRP2, SPTC2, BOP1, SMAD4, M4K4, HNRL2, MARK3, LARP7, CNN2, PP4R2, PEPD, CDCA2, Q3TFP0, GUAA, PDE12, Q3TL72, PRC2C, NOL9, FUBP2, TRADD, CTU2, ZN865, Q3U4W8, Q3UG37, NAT9, NOL8, Q3UJQ9, SC31A, NCBP1, LRRF1, DDX17, LRC47, JIP4, EHMT1, CA050, AAPK1, NSRP1, Q5RL57, Q5SQB0, TENS3, PUR4, Q5UE59, SRC8, SAMH1, KHDR1, GRB10, HELLS, SPB6, RIPK1, CAPR1, ASNS, LAP2A, CDC37, TS101, SNTB2, FNTA, BAP31, PLPP1, FSCN1, FXR1, DDX5, ATRX, DDX3Y, DDX3X, TGFI1, DBNL, SH3G1, CYTB, SMAD2, NDRG1, ZYX, SQSTM, TPP2, ZN512, LAR4B, F120A, CNDG2, NOP58, LTV1, Q6NV52, Q6NXL1, Q6NZD2, ANKL2, Q6P5B5, XPO1, KIF15, FHOD1, TXLNA, PTN23, JUPI2, NUDC1, TACC1, UBE2O, LARP1, ACAP2, 2AAA, MTCH2, ZN503, CYFP1, HNRPQ, SPAG7, DEK, ACTN1, ATX2L, CKP2L, ZN516, ERBIN, SEPT9, PGRC2, Q80VB6, PI42B, ZN598, SAFB2, Q80ZX0, DLG1, LPP, PEF1, IF4B, FTO, TIPRL, Q8BH80, MISSL, ERC6L, CARF, PRUN1, NUP93, FBX30, HBAP1, AHSA1, RCC2, IPO5, SYLC, CKAP4, MAP11, PALM2, CPNE3, SENP7, CSN7B, NSD2, DPP9, Q8BWW3, KANK2, PXK, PIGT, ITPK1, NHLC2, MAP1S, GWL, PKHH2, CND2, THOP1, SEP11, SKA3, CA198, SEP10, AROS, UBA6, LIPB1, SMAG1, Q8CCM0, ZN276, NAA30, SNX8, SYEP, OGT1, GNL3, PDLI5, FERM2, AGO2, HMCS1, AMERL, SCNM1, DNM1L, NEK9, ANLN, EDC3, MATR3, CHAP1, MEPCE, ERF3A, CC137, TDIF2, VPS18, RFC3, MCMBP, HEXI1, LUZP1, SNP47, TMX1, MAVS, UBXN4, Q8VCQ8, ACSF2, PARN, VIGLN, PSMD2, NAA40, F1142, ZNG1, PAXI, SFPQ, CPIN1, RAB14, IPYR2, PUS7, CSDE1, PIP30, RABE2, CISD1, Q91X76, DUS3L, KCC1A, TTC1, SRGP2, SNX18, RISC, HNRLL, Q921K2, PP6R3, LRC59, UBXN1, DBR1, KCC2G, Q924B0, WAC, SMC6, PAWR, SIAS, STML2, PSIP1, NXF1, PDXD1, NONO, PLST, RRAGC, VMA5A, MAOM, DCTN2, ZN281, CT2NL, GRPE1, ABD12, NU155, OGFR, NPM3, NOP16, GLOD4, DUT, MTAP, IFM3, CYB5B, PAF15, PSMD9, WIPI3, SKA2, VATG1, CHSP1, LRC40, RANB3, SMC1A, MFR1L, ARHGP, DDX47, TBC15, PPIL4, MPPB, CYBP, TECR, SERB1, ZCHC8, SPCS2, Q9CZP3, CD37L, SSBP3, MMS19, MGRN1, ARPIN, HNRPM, SYRC, MCES, Q9D4G5, ATAD1, F162A, TRIR, IPYR, PHF10, ARFG3, ORN, BOLA1, CNN3, KAP0, PLIN3, AKAP8, XRN2, GNAI3, PUR6, RAI14, SENP3, ARFG1, SIL1, VPS35, DGCR8, SYCC, ELP4, LIMA1, XPO2, RBP2, RTN3, PALLD, TMOD3, STK3, COPB, NUP50, DDX21, SH3L1, DDX20, MBNL1, BAG3, GKAP1, ZN207, TRXR1, PPCE, CAF1A, LIMD1, NDRG3, DNJC7, NFU1, COPG1, NUBP1, SMAP, DEST, ACOT9, PR40A, FOXO1, FIZ1, NFKB2, KAD2, AKA12, PRKRA, PDC6I, CHIP, COR1C, VAPA, NDKM, E41L3, TAGL2, CARM1, MTNB, BCL10, IF2G, P5CS, COG1, MD2L1, EIF3G, SAE2, ILF3, TRIP6, USO1, BAZ1B, HNRPF, KEAP1
Species: Mus musculus
Download
Trinidad JC, Barkan DT, Gulledge BF, Thalhammer A, Sali A, Schoepfer R, Burlingame AL. Global identification and characterization of both O-GlcNAcylation and phosphorylation at the murine synapse. Molecular & cellular proteomics : MCP 2012 11(8) 22645316
Abstract:
O-linked N-acetylglucosamine (O-GlcNAc) is a dynamic, reversible monosaccharide modifier of serine and threonine residues on intracellular protein domains. Crosstalk between O-GlcNAcylation and phosphorylation has been hypothesized. Here, we identified over 1750 and 16,500 sites of O-GlcNAcylation and phosphorylation from murine synaptosomes, respectively. In total, 135 (7%) of all O-GlcNAcylation sites were also found to be sites of phosphorylation. Although many proteins were extensively phosphorylated and minimally O-GlcNAcylated, proteins found to be extensively O-GlcNAcylated were almost always phosphorylated to a similar or greater extent, indicating the O-GlcNAcylation system is specifically targeting a subset of the proteome that is also phosphorylated. Both PTMs usually occur on disordered regions of protein structure, within which, the location of O-GlcNAcylation and phosphorylation is virtually random with respect to each other, suggesting that negative crosstalk at the structural level is not a common phenomenon. As a class, protein kinases are found to be more extensively O-GlcNAcylated than proteins in general, indicating the potential for crosstalk of phosphorylation with O-GlcNAcylation via regulation of enzymatic activity.
O-GlcNAc proteins:
A0JNY3, A2A653, A2A654, TANC2, ZEP3, MA7D2, CKAP5, CAMP1, LZTS3, A2AJ19, AJM1, MA7D1, A2ALK6, RPGP1, UBR4, A2AP92, SKT, ANR63, A2ATK9, A2AUD5, A2BI30, A6H6J9, A6MDD2, A8DUV1, B1AQX6, B1AR09, GRIK3, B1ATI9, B1AWT3, NHSL2, FRS1L, UBP24, DLGP4, B2RQ57, B2RQ80, PYR1, B2RQL0, B2RQQ5, GNAI1, B2RUE8, OTU7B, B2RWX1, B6ZHC4, B6ZHC5, B7ZCA7, B7ZMP8, B7ZNA4, B7ZNF6, B7ZWM6, B9EHE8, CTTB2, B9EKL9, PTPRZ, D1FNM8, D3YU59, D3YWX2, DGKH, D3YXR8, PGBD5, SHAN1, D3Z0V7, D3Z2J5, D9HP81, E0CYT1, E9PUA3, E9PUC4, DGKD, E9PUR0, E9PV14, E9PV26, KI67, E9PWL1, E9PWM3, E9PY55, E9PZP8, E9Q1M1, E9Q2B2, E9Q3D6, NU153, E9Q3M9, E9Q4N6, E9Q616, E9Q6T8, E9Q6Y8, NUMA1, E9Q828, E9Q9I2, E9Q9J6, E9QA16, E9QAP7, E9QAR5, SC16A, E9QJU8, E9QMJ1, SYGP1, RFIP2, HXK2, CAN2, SC22B, DPYL2, STXB1, TCOF, DCTN1, GLU2B, EF2K, PRDX4, AIP, NUMBL, GSTO1, GSH0, M3K5, PSMD4, DHX15, NPC1, BMPR2, VIAAT, BCAT2, CTND2, PITM1, CSK22, REPS1, ACK1, SLK, CAC1B, PGRC1, IMPA1, SYUA, AKA7A, STRN, RL35A, AT2A2, PGAM2, ATX2, NMT1, E41L2, GPX4, EMC8, DHB12, HCN4, KDM6A, ZN326, SORL, GRPE2, KLC1, ZFR, O88568, HCN2, HCN1, BSN, TOM1, RPP30, DNJB5, COX1, HA1D, HBA, K2C1, MBP, ALDOA, PGFRB, LDHA, G6PI, ENPP1, NEUM, ANXA2, RIR1, HS90A, EGR1, MDHM, KCC4, NFL, NFM, GNAI2, PDIA1, NUCL, CADH1, RC3H2, LRC4B, IGS11, DERPC, UBB, IFI5B, IFI4, ANXA1, EF1A1, H2B1F, PARP1, HS90B, DMD, KCC2A, TCPA, A4, COX5A, GELS, UMPS, NCAM1, GPDA, MDHC, SRP54, RLA0, GLNA, H12, LEG1, DDX3L, SPTN1, AP2A2, TPIS, KS6A3, COF1, GNAO, NFH, SERPH, VIME, MTAP2, EIF3A, CBX3, IMDH2, MCM3, CTNA1, MAP4, GNA12, GNA13, PDIA3, PSB8, NCKP1, PABP1, FKBP4, HMGB2, AIMP1, LA, ACM4, SYWC, RANG, RAB5C, RAB18, CALX, PRDX1, RL12, PPM1B, DNLI1, CAP1, STAT3, PURA, OPRM, TCPQ, CX6A1, MSH2, H14, H11, ALDR, ALD2, CBP, AINX, NEDD4, RP3A, CAPZB, SRPRB, RL36, SOX2, HS74L, ADT1, ROA1, INPP, PCY1A, MCM4, CSRP3, RAB7A, CDN2A, HDGF, ADT2, IMA1, UBP10, KPYM, RIDA, HMGA2, RL10A, CCHL, SOX1, RAB2A, ATX1, CACB3, HMCS2, GOGA3, ATPK, ATPB, ACTN4, IDI1, ACOT8, PTPA, KCNN2, KCNN3, TB10A, TB182, SF3B6, MRTFB, DOCK4, MYPR, EIF3E, PCBP1, LIPA3, ACTB, IF4A1, SNP25, RAB10, CSN2, RRAS2, PRS8, RS15A, 1433E, RS18, RS11, SMD1, ABI2, EF1A2, ACTA, VATB2, RL23, RS24, GBB1, HSP7C, TCTP, GNAS2, 1433Z, HMGB1, IF5A1, ACTG, RS17, RS12, UB2L3, RACK1, ACTS, TBA4A, TBA1A, TBB4B, PLXA2, DCC, EBP, NFIX, EM55, HNRH2, NCOA1, ELAV1, RGRF2, USP9X, TCPB, TCPE, TCPZ, NUCB2, IRS2, WNK1, RL36A, CSRP1, SEPR, RS3A, DPYL1, MPRIP, CAC1A, ATP5J, BOP1, RS5, WBP2, CXAR, PLPL9, G3BP1, RBBP6, CDS1, TBB5, IL6RB, NMDE2, NMDE3, TOP2A, NOTC1, NDKB, AQP1, UBA1, CTNB1, S30BP, NUCB1, MARK3, APLP1, ENAH, ATPA, TF65, YES, MARK2, PGBM, PYC, CAPR2, EMAL1, LARP7, BAX, CNN2, LYAR, CHD8, CNNM1, INF2, TT21B, Q0IJ77, TRIO, VGF, TANC1, CDK12, Q14B66, MA6D1, NSUN2, MCM9, PHAR1, PSD3, Q2Q7P0, FILA2, Q3TAD4, NB5R4, GUAA, METK2, PRC2C, Q3TRG3, PLPL6, K22E, YETS2, Q3TY93, FUBP2, F117B, Q3U882, LBR, TM109, FOXK2, Q3UFK1, Q3UGZ4, TNR6C, DAB2P, ZEP2, AAK1, Q3UHT7, DTX3L, EDC4, PARP3, WASC4, GRIN1, Q3UQ23, SRBS2, THSD4, MRCKA, SPRY3, KSR2, GRM5, TBCD9, LRRF1, ARMX5, STOX2, SHAN3, UBN1, OXR1, DDX17, PHAR4, ANR28, ZN608, Q571B7, PRAG1, TAB3, Q58DZ3, IQEC2, Q5DU62, AAPK1, NUFP2, UNKL, SMG7, RBM27, CYFP2, TM1L2, PSME4, ANR40, Q5SUH6, GGNB2, SYNRG, Q5SVJ0, RPGP2, TBC9B, ACACA, Q5SXC4, Q5XJV5, LMTK3, RN123, ZDHC8, SRC8, MYL6, SKI, SAMH1, IRGM1, CLD11, NPT2A, SPB6, VDAC2, VDAC3, VDAC1, STYX, RBBP4, ASNS, NCOA2, LAP2A, PPM1G, ASTN1, PRDX2, HCFC1, APC, KCNA4, AP180, FXR1, GDIB, GRID2, GRID1, CBX5, SERA, LASP1, NPM, PCBP2, M3K7, SRBS1, DBNL, SH3G1, CYTB, IF4G2, MINT, ZYX, RALY, TFE3, Q640L6, AR13B, HECAM, NPDC1, SYN2, TBR1, ISG15, ABCG1, ATP4A, MRC2, G3PT, PTN13, TPP2, CTNA3, SBNO1, BEGIN, K1549, GIT1, SLAI1, PKP4, PEAK1, CDK13, SH3R1, MYOF, ABLM3, ARMX2, CE170, LAR4B, NOP58, Q6GR78, TPM4, NIPBL, RRP5, FBX41, Q6NVA3, RPRD2, WWC2, ZN532, Q6NXW0, S23IP, SMHD1, NEST, CSKI1, Q6P9N8, MTSS2, AHDC1, PTN23, TRAK1, SRSF1, CHD4, DLGP3, NUP98, NYAP1, KCC2D, AT1A3, AT1A2, NFRKB, RIGI, MAGI1, WDFY3, TACC1, GGYF2, PF21A, KDM3B, CNOT1, LARP1, Q6ZQB7, NU188, Q6ZQJ9, Q6ZQK4, RS9, RL10, IF2A, SC6A5, SEM6D, 2AAA, EEIG1, MTCH2, MRO2B, SCN4B, PLPR4, HNRPQ, TBB2A, SMAP2, Q7TNS5, PLPR3, MBB1A, LNP, TPPP, ATX2L, OTUB1, EXOS3, MAP6, ELP1, SI1L2, LRRC7, ERBIN, PHF24, R3HD2, NAV3, AGRL3, Q80TS6, AUXI, MADD, AVL9, PUM1, UBP8, NU214, SEPT9, NAA15, CAMP3, FA98B, TDRKH, EPN1, TMCC2, AGFG2, Q80X68, C2C2L, FLNB, LRRT4, WNK3, PRIC2, CNKR2, ZN598, SHAN2, AGRB3, Q80ZX0, ZFYV1, MAST4, RHG32, ENTP3, LPP, PEF1, ACTBL, TET3, MYPT2, IF4B, SYAC, F168A, TBL1R, TB10B, CSTP1, CARF, TGO1, FRM4A, SYIM, ANS1B, DLGP2, ZNT6, RCC2, ABLM2, LSS, UNC80, NOE2, CF015, ODP2, GGA3, SYLC, DMXL2, IMP2L, CLAP2, LIPA2, ASPH, CNOT4, FLNA, F163B, GEPH, CREST, KCC1D, PGES2, KANK2, GEMI5, IFFO1, OSBL6, YTHD3, TM266, POGZ, LACC1, MAP1S, A16L1, SI1L1, PP4R4, MYO9A, THOP1, RBM14, Q8C2R1, CNOT2, Q8C6E9, CC134, ANK2, ELFN1, DIDO1, NHSL1, WDR37, DCTN4, SYNPO, BCAS3, VCIP1, Q8CE98, TAB1, SCYL2, NED4L, SYEP, F193A, GNAL, OGT1, NAV1, SYNJ1, RPGF2, EP400, PHC3, P66A, TBCE, VWF, STAU2, LIN7A, TBC23, ZBT20, RTN1, HS12A, DNM1L, UNC5B, UNC5A, ANLN, AGFG1, MATR3, Q8K314, AHI1, NDUS8, I2BPL, PREP, ABLM1, EIF3L, ERF3A, HNRPL, IQEC1, DOCK7, DC1L1, SPART, BST2, RFIP5, AT2A1, NUP35, LUZP1, MAVS, MYH9, PARN, AT1A1, SIR2, SNRK, ZDHC5, CC50A, AMOT, AGAP3, MARK1, Q8VHM5, FLNC, SFPQ, CPIN1, WDR13, BACH, S12A5, RAB14, ACLY, MIC25, ATPG, DDX1, SH3L3, UBAP2, NCOA5, CSDE1, FRS3, ZFN2B, DLG2, PTBP2, SRGP1, TMLH, DYST, SYUB, ELOV6, ALS2, TADBP, TBB6, CLIP1, LRC59, K2C5, UBXN1, SIR1, SPRE1, PAWR, MED1, MEP50, STML2, UBP11, NONO, RRAGC, VMA5A, MAOM, DCTN2, NEUA, DDAH2, DNJA3, TRXR3, RB6I2, SRRT, DSRAD, Q99NC2, RIMS1, ANR17, NU155, NTRI, RRBP1, ZN318, TRI33, ATP5L, RL17, GLOD4, DUT, SDHB, GLRX3, IFM3, NECP1, OCAD1, RRP44, TBB2B, DDAH1, YIF1B, ROA0, NIP7, MPPB, CYBP, RL11, TECR, CHTOP, SERB1, QCR1, NNRD, GARS, TOM70, RS19, SYRC, CNDP2, TMEDA, ODO2, DLGP1, TBB4A, IDH3A, IPYR, RL37, FIP1, TIM50, EF1G, RM17, GSDMD, DDA1, F135B, TM263, CNN3, PLIN3, PGAM1, XRN2, MYPT1, DJC10, KC1D, GNAI3, PUR6, S38A3, NDUBA, CRIP2, TSC1, RAI14, NBEA, TCF20, SORC2, DPYL5, TBB3, RBP2, ARHG7, RTN3, SPN90, RBCC1, PSMG2, DDX24, CLD12, PALLD, ELF2, TMOD3, NUDT3, COPB, NUP50, DDX21, TULP4, FLII, RPF2, CCG3, TBA8, IQGA1, NECT1, ADRM1, FMN2, PALS1, DCLK1, BAG3, CUL3, MINK1, REEP6, TRXR1, SYGP1, SON, APBB1, DREB, SPY2, MACF1, ULK2, ZBP1, TOM40, ADDA, GOGA5, DNJB1, MAP1A, PCLO, GAB1, RIPK3, NPAS3, SH2D3, NUBP2, ZEB2, SYT7, DEST, TEBP, SRS10, RPGR, PR40A, KHDR3, TPSN, CDYL, KAD2, TEN1, PDC6I, CHIP, IF4H, COR1B, COR1C, TNIP1, GANP, ARC, MPP2, SHAN1, VAPA, GSK3B, DEMA, E41L3, JIP1, GBP2, CAD20, P5CS, LAT1, DYR1B, MD2L1, SAE2, APCL, SYVC, MTMR1, MECP2, E41L1, SUCB1, HDAC6, GRIA4, HOME1, OSB10
Species: Mus musculus, Rattus norvegicus
Download
Luo B, Parker GJ, Cooksey RC, Soesanto Y, Evans M, Jones D, McClain DA. Chronic hexosamine flux stimulates fatty acid oxidation by activating AMP-activated protein kinase in adipocytes. The Journal of biological chemistry 2007 282(10) 17227772
Abstract:
The hexosamine biosynthesis pathway (HBP) serves as a nutrient sensor and has been implicated in the development of type 2 diabetes. We previously demonstrated that fatty acid oxidation was enhanced in transgenic mouse adipocytes, wherein the rate-limiting enzyme of the HBP, glutamine:fructose-6-phosphate amidotransferase (GFA), was overexpressed. To explore the molecular mechanism of the HBP-induced fatty acid oxidation in adipocytes, we studied AMP-activated protein kinase (AMPK), an energy sensor that stimulates fatty acid oxidation by regulating acetyl-CoA carboxylase (ACC) activity. Phosphorylation and activity of AMPK were increased in transgenic fat pads and in 3T3L1 adipocytes treated with glucosamine to stimulate hexosamine flux. Glucosamine also stimulated phosphorylation of ACC and fatty acid oxidation in 3T3L1 adipocytes, and these stimulatory effects were diminished by adenovirus-mediated expression of a dominant negative AMPK in 3T3L1 adipocytes. Conversely, blocking the HBP with a GFA inhibitor reduced AMPK activity, ACC phosphorylation, and fatty acid oxidation. These changes are not explained by alterations in the cellular AMP/ATP ratio. Further demonstrating that AMPK is regulated by the HBP, we found that AMPK was recognized by succinylated wheat germ agglutinin, which specifically binds O-GlcNAc. The levels of AMPK in succinylated wheat germ agglutinin precipitates correlated with hexosamine flux in mouse fat pads and 3T3L1 adipocytes. Moreover, removal of O-GlcNAc by hexosaminidase reduced AMPK activity. We conclude that chronically high hexosamine flux stimulates fatty acid oxidation by activating AMPK in adipocytes, in part through O-linked glycosylation.
O-GlcNAc proteins:
AAPK1
Species: Mus musculus
Download
Page 1 of 1