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Wu J, Liu J, Lapenta K, Desrouleaux R, Li MD, Yang X. Regulation of the urea cycle by CPS1 O-GlcNAcylation in response to dietary restriction and aging. Journal of molecular cell biology 2022 14(3) 35285892
Abstract:
O-linked N-acetyl-glucosamine glycosylation (O-GlcNAcylation) of intracellular proteins is a dynamic process broadly implicated in age-related disease, yet it remains uncharacterized whether and how O-GlcNAcylation contributes to the natural aging process. O-GlcNAc transferase (OGT) and the opposing enzyme O-GlcNAcase (OGA) control this nutrient-sensing protein modification in cells. Here, we show that global O-GlcNAc levels are increased in multiple tissues of aged mice. In aged liver, carbamoyl phosphate synthetase 1 (CPS1) is among the most heavily O-GlcNAcylated proteins. CPS1 O-GlcNAcylation is reversed by calorie restriction and is sensitive to genetic and pharmacological manipulations of the O-GlcNAc pathway. High glucose stimulates CPS1 O-GlcNAcylation and inhibits CPS1 activity. Liver-specific deletion of OGT potentiates CPS1 activity and renders CPS1 irresponsive to further stimulation by a prolonged fasting. Our results identify CPS1 O-GlcNAcylation as a key nutrient-sensing regulatory step in the urea cycle during aging and dietary restriction, implying a role for mitochondrial O-GlcNAcylation in nutritional regulation of longevity.
O-GlcNAc proteins:
CPSM
Species: Mus musculus
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Soria LR, Makris G, D'Alessio AM, De Angelis A, Boffa I, Pravata VM, Rüfenacht V, Attanasio S, Nusco E, Arena P, Ferenbach AT, Paris D, Cuomo P, Motta A, Nitzahn M, Lipshutz GS, Martínez-Pizarro A, Richard E, Desviat LR, Häberle J, van Aalten DMF, Brunetti-Pierri N. O-GlcNAcylation enhances CPS1 catalytic efficiency for ammonia and promotes ureagenesis. Nature communications 2022 13(1) 36064721
Abstract:
Life-threatening hyperammonemia occurs in both inherited and acquired liver diseases affecting ureagenesis, the main pathway for detoxification of neurotoxic ammonia in mammals. Protein O-GlcNAcylation is a reversible and nutrient-sensitive post-translational modification using as substrate UDP-GlcNAc, the end-product of hexosamine biosynthesis pathway. Here we show that increased liver UDP-GlcNAc during hyperammonemia increases protein O-GlcNAcylation and enhances ureagenesis. Mechanistically, O-GlcNAcylation on specific threonine residues increased the catalytic efficiency for ammonia of carbamoyl phosphate synthetase 1 (CPS1), the rate-limiting enzyme in ureagenesis. Pharmacological inhibition of O-GlcNAcase, the enzyme removing O-GlcNAc from proteins, resulted in clinically relevant reductions of systemic ammonia in both genetic (hypomorphic mouse model of propionic acidemia) and acquired (thioacetamide-induced acute liver failure) mouse models of liver diseases. In conclusion, by fine-tuned control of ammonia entry into ureagenesis, hepatic O-GlcNAcylation of CPS1 increases ammonia detoxification and is a novel target for therapy of hyperammonemia in both genetic and acquired diseases.
O-GlcNAc proteins:
A0A075B5P3, A0A075B5P5, A0A075B5R4, A0A075B5V1, A0A077S9N1, A0A097PUH2, A0A0M4KM70, A0A0R4J135, A0A0R4J293, A0A1B0GT41, A0AUN0, A0JLV3, A2AA71, A5JUZ1, B1AXW5, B2RTM0, D3Z041, D3Z6F5, E9Q175, E9Q1S3, E9Q3W4, DESP, E9QNH6, E9QPE7, G5E8R3, H7BXC3, H9KV01, K3W4R2, BHMT1, IGKC, K2C1, K2C8, SPTN1, CPSM, SCP2, GRP75, KPYM, ATPB, CH60, TBA4A, WNK1, PKP1, PLAK, GSDA2, Q3TD51, Q3TH57, Q3TLH6, Q3TN99, Q3TZR8, Q3UF58, Q3UGJ7, Q3UHW2, Q3UKH3, PRRC1, SC31A, Q3UTZ4, K22O, Q3V222, Q4KL81, Q504P4, Q52L87, Q542G9, Q544B1, Q546G4, Q58E56, Q58E64, Q5FW97, Q5M9N9, Q5QNU0, MYH4, MYH1, HCFC1, DSG1A, MYH10, SPTB2, EST3A, Q68FG2, Q6ZQC2, Q71LX8, NU214, Q80WR0, Q80ZX0, ECHA, NUP54, Q8C140, Q8C153, CPSM, Q8C7S2, Q8CF71, OGT1, Q8CIF2, Q8N7N8, HUTU, MYH9, Q91V38, Q9CV13, Q9D828, ECHP, Q9DC41, MVP, Q9JJ20, Q9QZF3, MYO1C, CARM1, S4R192, S4R1W1, S4R2A9, S4R2L9
Species: Homo sapiens, Mus musculus
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Liu W, Han G, Yin Y, Jiang S, Yu G, Yang Q, Yu W, Ye X, Su Y, Yang Y, Hart GW, Sun H. AANL (Agrocybe aegerita lectin 2) is a new facile tool to probe for O-GlcNAcylation. Glycobiology 2018 28(6) 29562282
Abstract:
O-linked N-acetylglucosamine (O-GlcNAcylation) is an important post-translational modification on serine or threonine of proteins, mainly observed in nucleus or cytoplasm. O-GlcNAcylation regulates many cell processes, including transcription, cell cycle, neural development and nascent polypeptide chains stabilization. However, the facile identification of O-GlcNAc is a major bottleneck in O-GlcNAcylation research. Herein, we report that a lectin, Agrocybe aegerita GlcNAc-specific lectin (AANL), also reported as AAL2, can be used as a powerful probe for O-GlcNAc identification. Glycan array analyses and surface plasmon resonance (SPR) assays show that AANL binds to GlcNAc with a dissociation constant (KD) of 94.6 μM, which is consistent with the result tested through isothiocyanate (ITC) assay reported before (Jiang S, Chen Y, Wang M, Yin Y, Pan Y, Gu B, Yu G, Li Y, Wong BH, Liang Y, et al. 2012. A novel lectin from Agrocybe aegerita shows high binding selectivity for terminal N-acetylglucosamine. Biochem J. 443:369-378.). Confocal imaging shows that AANL co-localizes extensively with NUP62, a heavily O-GlcNAcylated and abundant nuclear pore glycoprotein. Furthermore, O-GlcNAc-modified peptides could be effectively enriched in the late flow-through peak from simple samples by using affinity columns Sepharose 4B-AANL or POROS-AANL. Therefore, using AANL affinity column, we identified 28 high-confidence O-linked HexNAc-modified peptides mapped on 17 proteins involving diverse cellular progresses, including transcription, hydrolysis progress, urea cycle, alcohol metabolism and cell cycle. And most importantly, major proteins and sites were not annotated in the dbOGAP database. These results suggest that the AANL lectin is a new useful tool for enrichment and identification of O-GlcNAcylated proteins and peptides.
O-GlcNAc proteins:
FSIP2, OTU7B, CATB, CATD, GRN, ALDH2, TB182, MCM2, NUCB1, LAR4B, RPRD2, CPSM, TIM23, CATZ, CLIP2
Species: Mus musculus
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