Annotations: 1KZL

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1kzla1	All beta proteins	Reductase/isomerase/elongation factor common domain	Riboflavin synthase domain-like	Riboflavin synthase	Riboflavin synthase	fission yeast (Schizosaccharomyces pombe ) [TaxId: 4896 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Riboflavin synthase	8030479	4003217	SCOP2 (2022-06-29)
A	SCOP2 Family	Riboflavin synthase	8030481	4003217	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Riboflavin synthase domain-like	8042858	3001812	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Riboflavin synthase domain-like	8042860	3001812	SCOP2 (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	Lum_binding	e1kzlA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: Lum_binding	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00677	Lumazine binding domain (Lum_binding)	Lumazine binding domain	This domain binds to derivatives of lumazine in some proteins. Some proteins have lost the residues involved in binding lumazine.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Riboflavin Synthase	riboflavin synthase activity transferase activity transferase activity, transferring alkyl or aryl (other than methyl) groups catalytic activity	water-soluble vitamin biosynthetic process small molecule biosynthetic process flavin-containing compound metabolic process vitamin biosynthetic process riboflavin biosynthetic process vitamin metabolic process flavin-containing compound biosynthetic process biosynthetic process metabolic process cellular process small molecule metabolic process water-soluble vitamin metabolic process riboflavin metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR017938	Riboflavin synthase-like beta-barrel	Homologous Superfamily
A	IPR026017	Lumazine-binding domain	Domain
A	IPR001783	Lumazine-binding protein	Family
A	IPR023366	ATP synthase subunit alpha, N-terminal domain-like superfamily	Homologous Superfamily

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

Chains	Enzyme Name	Description	Catalytic Residues
A	riboflavin synthase M-CSA #247	Riboflavin (vitamin B2) serves as a precursor of flavocoenzymes, which have essential roles as redox cofactors in all organisms. The final step in the biosynthesis of the vitamin is catalysed by the enzyme riboflavin synthase. This unusual reaction involves the dismutation of 6,7-dimethyl-8-ribityllumazine. A 4-carbon unit is transferred between two of the identical substrates to form riboflavin and 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione involving the cleavage of two C-N bonds and the formation of two C-C bonds by the transfer of a 4-carbon moiety. The three active sites of the trimer lie between pairs of monomers, although only one active site can be formed and catalytically competent at any one time. The homotrimer is non-existent in humans and is an attractive target for antimicrobial agents.	Defined by 7 residues: PHE:A-2SER:A-41CYS:A-48THR:A-50ALA:A-64HIS:A-102THR:A-148 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 2.5.1.9 (PDB Primary Data) Search M-CSA Motif + EC 2.5.1.9

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.