6PNL | pdb_00006pnl

Structure of Epimerase Mth375 from the thermophilic pseudomurein-containing methanogen Methanothermobacter thermautotrophicus

PDB DOI: https://doi.org/10.2210/pdb6PNL/pdb

Classification: ISOMERASE
Organism(s): Methanothermobacter thermautotrophicus
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2019-07-02 Released: 2020-07-08
Deposition Author(s): Carbone, V., Schofield, L.R., Sutherland-Smith, A.J., Ronimus, R.S.
Funding Organization(s): Royal Society of New Zealand

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.01 Å
R-Value Free:
0.190 (Depositor), 0.194 (DCC)
R-Value Work:
0.162 (Depositor), 0.166 (DCC)
R-Value Observed:
0.163 (Depositor)

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.5 of the entry. See complete history.

Literature

Structural characterisation of nucleotide sugar short-chain dehydrogenases/reductases from the thermophilic pseudomurein-containing methanogen Methanothermobacter thermautotrophicus Delta H.

Carbone, V., Schofield, L.R., Edwards, P.J.B., Sutherland-Smith, A.J., Ronimus, R.S.

(2025) FEBS J

PubMed: 40903920 Search on PubMed
DOI: https://doi.org/10.1111/febs.70248
Primary Citation Related Structures:
6PMH, 6PNL, 8W3U, 9AR1

PubMed Abstract:
Epimerases and dehydratases are widely studied members of the extended short-chain dehydrogenase/reductase (SDR) enzyme superfamily and are important in nucleotide sugar conversion and diversification, for example, the interconversion of uridine diphosphate (UDP)-linked glucose and galactose. Methanothermobacter thermautotrophicus contains a cluster of genes, the annotations of which indicate involvement in glycan biosynthesis such as that of cell walls or capsular polysaccharides. In particular, genes encoding UDP-glucose 4-epimerase related protein (Mth375), UDP-glucose 4-epimerase homologue (Mth380) and dTDP-glucose 4,6-dehydratase related protein (Mth373) may be involved in the biosynthesis of an unusual aminosugar in pseudomurein. In this paper, we present the structures of Mth375, an archaeal sugar epimerase/dehydratase protein (WbmF) determined to a resolution of 2.0 Å. The structure contains an N-terminal Rossmann-fold domain with bound nicotinamide adenine dinucleotide hydride (NADH) and a C-terminal catalytic domain with bound UDP. We also present the structure for Mth373 co-crystallised with uridine-5'-diphosphate-xylopyranose to a resolution of 1.96 Å as a NAD ⁺-dependent oxidative decarboxylase (UDP-xylose synthase; EC4.1.1.35). Molecular modelling has also allowed for the identification of Mth380 as a UDP-N-acetylglucosamine 4-epimerase (WbpP; EC5.1.3.7), Mth631 as a UDP-glucose 4-epimerase (GalE; EC5.1.3.2) and Mth1789 as a classical dTDP-d-glucose 4,6-dehydratase (EC4.2.1.46). The UDP-sugar specificity of each archaeal nucleotide sugar short-chain dehydrogenase/reductase (NS-SDR) was elucidated via sequence, molecular modelling and structural analyses. Overall, these structures potentially shed light on the formation of the glycan portion of pseudomurein and capsular polysaccharide in Archaea.

Organizational Affiliation

AgResearch Ltd., Grasslands, Palmerston North, New Zealand.

Macromolecule Content

Total Structure Weight: 43.4 kDa
Atom Count: 3,087
Modeled Residue Count: 336
Deposited Residue Count: 368
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
UDP-glucose 4-epimerase related protein	A	368	Methanothermobacter thermautotrophicus	Mutation(s): 0
UniProt
Find proteins for O26475 (Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H)) Explore O26475 Go to UniProtKB: O26475
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O26475
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NAD (Subject of Investigation/LOI) Query on NAD Download:Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A] mmCIF format, chain B [auth A]	B [auth A]	NICOTINAMIDE-ADENINE-DINUCLEOTIDE C₂₁ H₂₇ N₇ O₁₄ P₂ BAWFJGJZGIEFAR-NNYOXOHSSA-N		Interactions Focus chain B [auth A] Interactions & Density Focus chain B [auth A]
UDP (Subject of Investigation/LOI) Query on UDP Download:Ideal Coordinates CCD File SDF format, chain C [auth A] MOL2 format, chain C [auth A] mmCIF format, chain C [auth A]	C [auth A]	URIDINE-5'-DIPHOSPHATE C₉ H₁₄ N₂ O₁₂ P₂ XCCTYIAWTASOJW-XVFCMESISA-N		Interactions Focus chain C [auth A] Interactions & Density Focus chain C [auth A]
SO4 Query on SO4 Download:Ideal Coordinates CCD File SDF format, chain G [auth A] MOL2 format, chain G [auth A] mmCIF format, chain G [auth A]	G [auth A]	SULFATE ION O₄ S QAOWNCQODCNURD-UHFFFAOYSA-L		Interactions Focus chain G [auth A] Interactions & Density Focus chain G [auth A]
EDO Query on EDO Download:Ideal Coordinates CCD File SDF format, chain F [auth A] SDF format, chain E [auth A] SDF format, chain D [auth A] MOL2 format, chain F [auth A] MOL2 format, chain E [auth A] MOL2 format, chain D [auth A] mmCIF format, chain F [auth A] mmCIF format, chain E [auth A] mmCIF format, chain D [auth A]	D [auth A], E [auth A], F [auth A]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Interactions & Density Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A]