Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyFAD-binding/transporter-associated domain-like 8036705 3000913 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyUridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain 8036714 3000935 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AFAD_binding_4e1mbbA1 A: a+b complex topologyX: FAD-binding domain-likeH: FAD-binding domain (From Topology)T: FAD-binding domainF: FAD_binding_4ECOD (1.6)
AMurB_Ce1mbbA2 A: a+b complex topologyX: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain (From Topology)H: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain (From Topology)T: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domainF: MurB_CECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF01565FAD binding domain (FAD_binding_4)FAD binding domainThis family consists of various enzymes that use FAD as a co-factor, most of the enzymes are similar to oxygen oxidoreductase. One of the enzymes Vanillyl-alcohol oxidase (VAO) has a solved structure, the alignment includes the FAD binding site, call ...This family consists of various enzymes that use FAD as a co-factor, most of the enzymes are similar to oxygen oxidoreductase. One of the enzymes Vanillyl-alcohol oxidase (VAO) has a solved structure, the alignment includes the FAD binding site, called the PP-loop, between residues 99-110 [1]. The FAD molecule is covalently bound in the known structure, however the residue that links to the FAD is not in the alignment. VAO catalyses the oxidation of a wide variety of substrates, ranging form aromatic amines to 4-alkylphenols. Other members of this family include D-lactate dehydrogenase, this enzyme catalyses the conversion of D-lactate to pyruvate using FAD as a co-factor; mitomycin radical oxidase, this enzyme oxidises the reduced form of mitomycins and is involved in mitomycin resistance. This family includes MurB an UDP-N-acetylenolpyruvoylglucosamine reductase enzyme EC:1.1.1.158. This enzyme is involved in the biosynthesis of peptidoglycan [2].
Domain
PF02873UDP-N-acetylenolpyruvoylglucosamine reductase, C-terminal domain (MurB_C)UDP-N-acetylenolpyruvoylglucosamine reductase, C-terminal domainMembers of this family are UDP-N-acetylenolpyruvoylglucosamine reductase enzymes EC:1.1.1.158. This enzyme is involved in the biosynthesis of peptidoglycan.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
URIDINE DIPHOSPHO-N-ACETYLENOLPYRUVYLGLUCOSAMINE REDUCTASE

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
UDP-N-acetylenolpyruvylglucosamine reductase (MurB)  M-CSA #353

UDP-N-acetylenolpyruvylglucosamine reductase (MurB) reduces both E and Z isomers of enolbutyryl-UDP-GlcBAc analogs of the C3 enolpyruvate substate to UDP-methyl-N-acetylmuramic acid in the presence of NADPH. The overall product of this metabolic pathway, petidoglycan, is a biopolymer unique to Gram-positive and Gram-negative bacteria for which is essential for maintaining osmotic cell wall integrity. The absence of a homologue in eukaryotic cells makes MurB an attractive target for small molecule inhibitors with the potential to have broad antibacterial activity.

The ability of MurB to catalyse the stereo-selective reduction of both E and Z isomers of the substrate is thought to result from the active site architecture restricting free rotation around the C2-C3 bond, and slowing the rate relative to reprotonation. Structural data show the functional groups thought to be involved in the hydride transfer to C3 and protonation at C2 of the enol-ether substrate are arranged anti relative to the enol-double bond. From this information, the stereochemical outcome was predicted to yield a 2R,3R-dideuterio product. This product was later identified using chemical synthetic analysis and comparative NMR.

Defined by 3 residues: ARG:A-159SER:A-229GLU:A-325
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