6NCS

Crystal structure of N-acetylneuraminic acid (Sialic acid) synthetase from Leptospira borgpetersenii serovar Hardjo-bovis in complex with citrate

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	NeuB-like	8099097	4001943	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Aldolase	8099098	3000445	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Aldolase	8099098	3000445	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	NeuB	e6ncsA1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: NeuB	ECOD (1.6)
B	NeuB	e6ncsB1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: NeuB	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF03102	NeuB family (NeuB)	NeuB family	NeuB is the prokaryotic N-acetylneuraminic acid (Neu5Ac) synthase. It catalyses the direct formation of Neu5Ac (the most common sialic acid) by condensation of phosphoenolpyruvate (PEP) and N-acetylmannosamine (ManNAc). This reaction has only been ob ...	NeuB is the prokaryotic N-acetylneuraminic acid (Neu5Ac) synthase. It catalyses the direct formation of Neu5Ac (the most common sialic acid) by condensation of phosphoenolpyruvate (PEP) and N-acetylmannosamine (ManNAc). This reaction has only been observed in prokaryotes; eukaryotes synthesise the 9-phosphate form, Neu5Ac-9-P, and utilise ManNAc-6-P instead of ManNAc. Such eukaryotic enzymes are not present in this family [1]. This family also contains SpsE spore coat polysaccharide biosynthesis proteins.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	N-acetylneuraminic acid (Sialic acid) synthetase	transferase activity transferase activity, transferring alkyl or aryl (other than methyl) groups catalytic activity N-acylneuraminate-9-phosphate synthase activity cation binding ion binding binding metal ion binding small molecule binding	carbohydrate metabolic process biosynthetic process carbohydrate biosynthetic process primary metabolic process metabolic process glycosylation	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR051690	Nonulosonic Acid Synthase	Family
A, B	IPR013785	Aldolase-type TIM barrel	Homologous Superfamily
A, B	IPR013132	N-acetylneuraminic acid synthase, N-terminal	Domain

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.