7nut | pdb_00007nut

Crystal structure of human AMDHD2 in complex with Zn and GlcN6P

spinqualitylabelsall models 7nut, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7nut is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.898Å Ligands: GLP, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NAGA_HUMAN Hydrolyzes the N-glycolyl group from N-glycolylglucosamine 6-phosphate (GlcNGc-6-P) in the N-glycolylneuraminic acid (Neu5Gc) degradation pathway. Although human is not able to catalyze formation of Neu5Gc due to the inactive CMAHP enzyme, Neu5Gc is present in food and must be degraded. Publication Abstract from PubMed The hexosamine biosynthetic pathway (HBP) produces the essential metabolite UDP-GlcNAc and plays a key role in metabolism, health, and aging. The HBP is controlled by its rate-limiting enzyme glutamine fructose-6-phosphate amidotransferase (GFPT/GFAT) that is directly inhibited by UDP-GlcNAc in a feedback loop. HBP regulation by GFPT is well studied but other HBP regulators have remained obscure. Elevated UDPGlcNAc levels counteract the glycosylation toxin tunicamycin (TM) and thus we screened for TM resistance in haploid mouse embryonic stem cells (mESCs) using random chemical mutagenesis to determine alternative HBP regulation. We identified the Nacetylglucosamine deacetylase AMDHD2 that catalyzes a reverse reaction in the HBP and its loss strongly elevated UDP-GlcNAc. To better understand AMDHD2, we solved the crystal structure and found that loss-of-function is caused by protein destabilization or interference with its catalytic activity. Finally, we show that mESCs express AMDHD2 together with GFPT2 instead of the more common paralog GFPT1. Compared with GFPT1, GFPT2 had a much lower sensitivity to UDP-GlcNAc inhibition, explaining how AMDHD2 loss-of-function resulted in HBP activation. This HBP configuration in which AMDHD2 serves to balance GFPT2 activity was also observed in other mESCs and, consistently, the GFPT2:GFPT1 ratio decreased with differentiation of human embryonic stem cells. Together, our data reveal a critical function of AMDHD2 in limiting UDPGlcNAc production in cells that use GFPT2 for metabolite entry into the HBP. GFPT2/GFAT2 and AMDHD2 act in tandem to control the hexosamine pathway.,Kroef V, Ruegenberg S, Horn M, Allmeroth K, Ebert L, Bozkus S, Miethe S, Elling U, Schermer B, Baumann U, Denzel MS Elife. 2022 Mar 1;11. pii: 69223. doi: 10.7554/eLife.69223. PMID:35229715 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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