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Shu XE, Mao Y, Jia L, Qian SB. Dynamic eIF3a O-GlcNAcylation controls translation reinitiation during nutrient stress. Nature chemical biology 2022 18(2) 34887587
In eukaryotic cells, many messenger RNAs (mRNAs) possess upstream open reading frames (uORFs) in addition to the main coding region. After uORF translation, the ribosome could either recycle at the stop codon or resume scanning for downstream start codons in a process known as reinitiation. Accumulating evidence suggests that some initiation factors, including eukaryotic initiation factor 3 (eIF3), linger on the early elongating ribosome, forming an eIF3-80S complex. Very little is known about how eIF3 is carried along with the 80S during elongation and whether the eIF3-80S association is subject to regulation. Here, we report that eIF3a undergoes dynamic O-linked N-acetylglucosamine (O-GlcNAc) modification in response to nutrient starvation. Stress-induced de-O-GlcNAcylation promotes eIF3 retention on the elongating ribosome and facilitates activating transcription factor 4 (ATF4) reinitiation. Eliminating the modification site from eIF3a via CRISPR genome editing induces ATF4 reinitiation even under the nutrient-rich condition. Our findings illustrate a mechanism in balancing ribosome recycling and reinitiation, thereby linking the nutrient stress response and translational reprogramming.
O-GlcNAc proteins:
A0A075B5P4, A0A087WNV1, A0A087WPT1, A0A087WQF8, A0A087WS88, A0A0A0MQM6, A0A0A6YVP0, A0A0A6YY72, A0A0B4J1E2, A0A0G2JFJ6, A0A0G2JFN8, A0A0G2JFY0, A0A0G2JG10, A0A0G2JG59, A0A0G2JG60, A0A0G2JG65, A0A0G2JGL8, A0A0H2UH17, A0A0J9YTU3, A0A0J9YUT8, A0A0J9YUY8, A0A0N4SV00, A0A0N4SV32, A0A0N4SW94, A0A0N5E9G7, A0A0R4J060, A0A0R4J169, A0A0R4J1E3, A0A0R4J1Y4, A0A0R4J260, A1BN54, A1L341, A1L3S7, A2A485, A2A513, A2A5N3, A2A8V8, A2AGK3, LZTS3, A2AM70, A2AMY5, A2APQ6, A2AS44, A2AVJ7, A2AWT6, A2BGG7, KANL3, K1C28, A6X8Z3, A8Y5K6, B0V2N8, B1AU25, TBD2A, THOC2, TPC11, PLXB2, RBM25, B7FAU9, B7ZWM8, B8JK33, B9EHJ3, D3YTT9, D3YUW7, D3YV30, D3YV43, D3YVH4, D3YX49, D3YX64, D3YX85, SAFB1, D3YYT0, D3YZ62, D3YZL1, D3YZT4, D3Z1X3, D3Z2H7, D3Z3E8, D3Z4B0, CCD78, D3Z6N3, CILP2, D6RCG1, E0CY31, E0CYH0, E9PUA5, E9PUJ2, E9PUX0, GCN1, E9PVC6, E9PVG8, KI67, E9PW24, E9PYF4, SET1A, E9PYI8, E9PZW0, E9Q066, E9Q0F0, E9Q0M9, E9Q0U7, E9Q0Y4, E9Q133, E9Q166, E9Q175, E9Q1Z0, E9Q2X6, E9Q3G8, NOLC1, E9Q5F6, E9Q616, MYO1E, E9Q6A9, E9Q6M7, E9Q6T8, E9Q8F0, E9Q9C7, E9Q9H2, E9QA74, E9QAT0, E9QKG6, E9QLM4, E9QN31, E9QNH6, E9QNN1, E9QPE7, E9QPI5, F2Z480, F6S6G6, F6T0G2, F6TFN2, F6TW20, F6WTC8, F6XWD4, F6YRW4, F6YUI5, F7B296, F7C312, FARP1, F8VPX1, F8VQ29, F8WHR6, G3UWP5, G3UWZ0, G3UX48, G3UYD0, G3UYG6, G3UYW3, G3UYZ0, G3X8P9, G3X8Q0, G3X956, SI1L3, G5E839, G5E846, G5E866, G5E879, G5E8C3, G5E8J8, G5E8N3, G5E8T6, H3BJU7, H3BKF6, H3BKM0, H3BKN0, H3BKT5, H3BL49, J3QMC5, J3QNW0, CAN2, ATN1, SRSF5, IMA3, PININ, EIF3D, ATX2, E41L2, UGDH, SP3, IF2B1, ZFR, HIPK1, IGKC, IGHG1, HBA, K2C1, TBA1B, ALBU, HS90A, NUCL, ATX1L, EF1A1, H2B1F, CO1A1, HS90B, TCPA, GELS, HS71L, AP2A2, K1C19, BIP, VIME, MFGM, EIF3A, MCM3, MOES, CTNA1, U2AF2, PDIA3, GRN, PABP1, FKBP4, KIF4, TSP1, GRP75, TKT, BCL6, FOXK1, H14, NEDD4, LMNA, MCM5, K2C6A, IMA1, KPYM, DDX6, ACTN4, EF2, ASXL1, ACTB, ABCE1, RRAS2, H4, HSP7C, CH60, TBA1A, TBB4B, H31, IMB1, TCPB, TCPE, TCPZ, WNK1, H32, MPRIP, G3BP1, TBB5, HNRL2, TOP2A, UBA1, PLAK, IF2P, EPS8, LRIQ1, ZCH18, LMTD2, FA83H, CDCA2, CYTSA, SPP2B, Q3TJ56, K22E, FUBP2, Q3U6F1, Q3U8S1, FOXK2, PUF60, Q3UID0, Q3UJB0, Q3UNN4, SFSWA, K22O, CFA74, Q3UYN2, LRRF1, ESF1, KIF22, Q3V3Y9, Q45VK5, Q4FJZ2, Q4KL80, Q4TU83, PDS5B, DDX17, LRC47, Q52KR6, TR150, NEXMI, JCAD, NUFP2, PRSR1, RBM27, PHF12, UTP18, LC7L3, Q5SUT0, TSR1, MYO1D, Q5U4C5, SIN3A, SRC8, MYL6, STIP1, CAPR1, IMA5, LAP2A, HCFC1, K1C15, SMRD1, FXR1, DDX5, HS71A, SERA, KINH, MYH10, SIN3B, DDX3X, TIF1B, NUP62, K1C12, SQSTM, TOP2B, Q68EM3, CLH1, CDC5L, F120A, CNDG2, NOP58, SCAF8, K1C42, K2C1B, SR140, ZC11A, ABCF1, RRP12, Q6P5B5, UGGG1, XPO1, KIF11, FHOD1, LPPRC, NUP98, Q6PGF5, NEB2, DAPLE, UBE2O, LARP1, NU188, WDR43, 2AAA, Q792Z1, PICAL, UHRF2, MBB1A, Q7TQE2, NU214, WNK4, KIRR1, UBP2L, FLNB, WNK3, Q80ZX0, LPP, ACTBL, P4HTM, MYPT2, HTSF1, IF4B, NU107, WDR3, NOC4L, CE128, NUP93, SUN2, RCC2, EMSY, SYLC, CKAP4, SRRM2, NUP54, PWP2, SYIC, RL1D1, MAP1S, TTC34, SI1L1, RBM14, Q8C872, DIDO1, ATAD2, NUP88, Q8CFQ9, SMC2, UACA, SYEP, TCRG1, OGT1, CCAR1, SLTM, BICRL, P66A, COPA, HMCS1, Q8JZN2, EIF3B, BCLF1, PHLB2, NAT10, ANLN, SDHA, LS14A, MATR3, DDX18, PO121, EIF3L, HNRPL, NU133, EIF3C, ZC3HA, TDIF2, NUP58, CD109, LUZP1, UTP6, MYH9, UHRF1, VIGLN, CCAR2, CUL7, K2C79, Q8VGW3, DHX36, SFPQ, ACLY, DDX1, U3IP2, SYYC, RPN1, YTHD2, BMP2K, SNX18, SMCA5, Q921K2, SF3B3, DDX27, Q921S6, SMTN, PP6R3, K2C5, DEN2B, NXF1, NONO, ACON, NMD3, RTCB, CT2NL, HSP7E, NU155, IF2B3, Q9CPN9, SMC1A, SMC3, CXXC1, GARS, CEP72, SC23B, Q9D6D0, NOP56, FIP1, SPB1, MYPT1, NVL, EIF3F, RAI14, CPSF1, PESC, VPS35, LIMA1, DKC1, PALLD, NUP50, DDX21, FLII, YBOX3, IQGA1, Q9QUK9, CAF1A, K1C17, MAGD1, MTA2, PR40A, MYO1C, COR1C, E41L3, EHD1, WDR46, ZO2, NU160, ADNP, SYVC, Q9Z1R9, BAZ1B, K1C16, SNUT1, S4R2A9, S4R2J9, V9GX87
Species: Mus musculus
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
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.