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Crystal structure of the C. elegans POFUT2 (CePoFUT2) triple mutant (R298K-R299K-A418C) in complex with the Rattus norvegicus TSR4 single mutant (E10C) from F-spondin
Structural highlights
FunctionOFUT2_CAEEL Catalyzes the reaction that attaches fucose through an O-glycosidic linkage to a conserved serine or threonine residue in the consensus sequence C1-X(2,3)-S/T-C2-X(2)-G of thrombospondin type I repeats (TSRs) where C1 and C2 are the first and second cysteines of the repeat, respectively. O-fucosylates members of several protein families including the ADAMTS superfamily and the thrombosporin (TSP) and spondin families. Required for the proper secretion of ADAMTS family members such as ADAMSL1 and ADAMST13 (By similarity).[1] SPON1_RAT Cell adhesion protein that promotes the attachment of spinal cord and sensory neuron cells and the outgrowth of neurites in vitro. May contribute to the growth and guidance of axons in both the spinal cord and the PNS. Publication Abstract from PubMedProtein O-fucosyltransferase 2 (PoFUT2) is an inverting glycosyltransferase (GT) that fucosylates thrombospondin repeats (TSRs) from group 1 and 2. PoFUT2 recognizes a large and diverse number of TSRs through a dynamic network of water-mediated interactions. By X-ray structural studies of C. elegans PoFUT2 complexed to a TSR of group 2, we demonstrate that this GT recognizes similarly the 3D structure of TSRs from both groups 1 and 2. Its active site is highly exposed to the solvent, suggesting that water molecules might also play an essential role in the fucosylation mechanism. We applied QM/MM methods using human PoFUT2 as a model, and found that HsPoFUT2 follows a classical S(N) 2 reaction mechanism in which water molecules contribute to a great extent in facilitating the release of the leaving pyrophosphate unit, causing the H transfer from the acceptor nucleophile (Thr/Ser) to the catalytic base, which is the last event in the reaction. This demonstrates the importance of water molecules not only in recognition of the ligands but also in catalysis. The Essential Role of Water Molecules in the Reaction Mechanism of Protein O-Fucosyltransferase 2.,Sanz-Martinez I, Garcia-Garcia A, Tejero T, Hurtado-Guerrero R, Merino P Angew Chem Int Ed Engl. 2022 Nov 25;61(48):e202213610. doi: , 10.1002/anie.202213610. Epub 2022 Nov 10. PMID:36260536[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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