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6WJ9

UDP-GlcNAc C4-epimerase mutant S121A/Y146F from Pseudomonas protegens in complex with UDP-GlcNAc

Summary for 6WJ9
Entry DOI10.2210/pdb6wj9/pdb
DescriptorNAD-dependent epimerase/dehydratase family protein, NICOTINAMIDE-ADENINE-DINUCLEOTIDE, URIDINE-DIPHOSPHATE-N-ACETYLGLUCOSAMINE, ... (4 entities in total)
Functional Keywordsshort chain dehydrogenase, isomerase, complex, nad dependent
Biological sourcePseudomonas protegens
Total number of polymer chains2
Total formula weight67815.31
Authors
Marmont, L.S.,Willams, R.J.,Whitney, J.C.,Whitfield, G.B.,Robinson, H.,Parsek, M.R.,Nitz, M.,Harrison, J.J.,Howell, P.L. (deposition date: 2020-04-13, release date: 2020-07-08, Last modification date: 2023-10-18)
Primary citationMarmont, L.S.,Whitfield, G.B.,Pfoh, R.,Williams, R.J.,Randall, T.E.,Ostaszewski, A.,Razvi, E.,Groves, R.A.,Robinson, H.,Nitz, M.,Parsek, M.R.,Lewis, I.A.,Whitney, J.C.,Harrison, J.J.,Howell, P.L.
PelX is a UDP-N-acetylglucosamine C4-epimerase involved in Pel polysaccharide-dependent biofilm formation.
J.Biol.Chem., 295:11949-11962, 2020
Cited by
PubMed Abstract: Pel is a GalNAc-rich bacterial polysaccharide that contributes to the structure and function of biofilms. The operon is highly conserved among diverse bacterial species, and Pel may therefore be a widespread biofilm determinant. Previous annotation of gene clusters has helped us identify an additional gene, , that is present adjacent to in >100 different bacterial species. The gene is predicted to encode a member of the short-chain dehydrogenase/reductase (SDR) superfamily, but its potential role in Pel-dependent biofilm formation is unknown. Herein, we have used Pf-5 as a model to elucidate PelX function as lacks a homologue in its gene cluster. We found that forms Pel-dependent biofilms; however, despite expression of under these conditions, biofilm formation was unaffected in a Δ strain. This observation led us to identify a paralogue, PFL_5533, which we designate here PgnE, that appears to be functionally redundant to In line with this, a Δ Δ double mutant was substantially impaired in its ability to form Pel-dependent biofilms. To understand the molecular basis for this observation, we determined the structure of PelX to 2.1 Å resolution. The structure revealed that PelX resembles UDP-GlcNAc C4-epimerases. Using H NMR analysis, we show that PelX catalyzes the epimerization between UDP-GlcNAc and UDP-GalNAc. Our results indicate that Pel-dependent biofilm formation requires a UDP-GlcNAc C4-epimerase that generates the UDP-GalNAc precursors required by the Pel synthase machinery for polymer production.
PubMed: 32601062
DOI: 10.1074/jbc.RA120.014555
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (2.11 Å)
Structure validation

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