Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1lxaa_ All beta proteins Single-stranded left-handed beta-helix Trimeric LpxA-like enzymes UDP N-acetylglucosamine acyltransferase UDP N-acetylglucosamine acyltransferase (Escherichia coli K-12 ) [TaxId: 83333 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyTrimeric LpxA-like enzymes 8043123 3001804 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AHexapep_2_1e1lxaA1 A: beta duplicates or obligate multimersX: Single-stranded left-handed beta-helixH: Trimeric LpxA-like enzymes (From Topology)T: Trimeric LpxA-like enzymesF: Hexapep_2_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A2.160.10.10 Mainly Beta 3 Solenoid UDP N-Acetylglucosamine Acyltransferase domain 1CATH (4.3.0)
A1.20.1180.10 Mainly Alpha Up-down Bundle Udp N-acetylglucosamine O-acyltransferase Domain 2CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF00132Bacterial transferase hexapeptide (six repeats) (Hexapep)Bacterial transferase hexapeptide (six repeats)- Repeat
PF13720Udp N-acetylglucosamine O-acyltransferase; Domain 2 (Acetyltransf_11)Udp N-acetylglucosamine O-acyltransferase; Domain 2This is domain 2, or the C-terminal domain, of Udp N-acetylglucosamine O-acyltransferase. This enzyme is a zinc-dependent enzyme that catalyses the deacetylation of UDP-3-O-((R)-3-hydroxymyristoyl)-N-acetylglucosamine to form UDP-3-O-(R-hydroxymyris ...This is domain 2, or the C-terminal domain, of Udp N-acetylglucosamine O-acyltransferase. This enzyme is a zinc-dependent enzyme that catalyses the deacetylation of UDP-3-O-((R)-3-hydroxymyristoyl)-N-acetylglucosamine to form UDP-3-O-(R-hydroxymyristoyl)glucosamine and acetate.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
UDP N-ACETYLGLUCOSAMINE O-ACYLTRANSFERASE

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

ChainsEnzyme NameDescriptionCatalytic Residues
acyl-[acyl-carrier-protein]-UDP-N-acetylglucosamine O-acyltransferase  M-CSA #69

UDP-N-acetylglucosamine (UDP-GlcNAc) acyltransferase catalyzes the first step in the biosynthesis of lipid A, the hydrophobic anchor of lipopolysaccharide in Gram-negative bacteria. This enzyme, the product of the lpxA gene, transfers an R-3-hydroxyacyl chain fromR-3-hydroxyacyl-acyl carrier protein (ACP) to the glucosamine 3-OH of UDP-GlcNAc. The acylation of UDP-GlcNAc is characterized by an unfavorable equilibrium constant (0.01). Therefore, the second reaction of lipid A biosynthesis, in which the LpxA product UDP-3-O-(R-3-hydroxyacyl)-GlcNAc is deacetylated, is the first irreversible step of the pathway. Lipid A is required for growth of E. coli and most other Gram-negative bacteria. Lipid A is also necessary for maintaining the integrity of the outer membrane as a barrier to toxic chemicals. Furthermore, lipid A is a potent activator of innate immunity in animal systems. The study of the enzymes involved in lipid A biosynthesis should therefore prove useful for the development of new anti-infective drugs.

Defined by 3 residues: HIS:A-125ASP:A-126GLY:A-143
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