Q3AUB5 (RISB_CHLCH) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
6,7-dimethyl-8-ribityllumazine synthase
Short name=DMRL synthase
Short name=Lumazine synthase
EC=2.5.1.9

Alternative name(s):
Riboflavin synthase beta chain

Gene names

Name:	ribH
Ordered Locus Names:	Cag_0132

Organism

Chlorobium chlorochromatii (strain CaD3) [Complete proteome] [HAMAP]

Taxonomic identifier

340177 [NCBI]

Taxonomic lineage

Bacteria › Chlorobi › Chlorobia › Chlorobiales › Chlorobiaceae › Chlorobium/Pelodictyon group › Chlorobium

Protein attributes

Sequence length	155 AA.
Sequence status	Complete.
Protein existence	Inferred from homology

General annotation (Comments)

Function	Riboflavin synthase is a bifunctional enzyme complex catalyzing the formation of riboflavin from 5-amino-6-(1'-D)-ribityl-amino-2,4(1H,3H)-pyrimidinedione and L-3,4-dihydrohy-2-butanone-4-phosphate via 6,7-dimethyl-8-lumazine. The beta subunit catalyzes the condensation of 5-amino-6-(1'-D)-ribityl-amino-2,4(1H,3H)-pyrimidinedione with L-3,4-dihydrohy-2-butanone-4-phosphate yielding 6,7-dimethyl-8-lumazine By similarity. HAMAP MF_00178
Catalytic activity	2 6,7-dimethyl-8-(1-D-ribityl)lumazine = riboflavin + 4-(1-D-ribitylamino)-5-amino-2,6-dihydroxypyrimidine. HAMAP MF_00178
Pathway	Cofactor biosynthesis; riboflavin biosynthesis; riboflavin from 2-hydroxy-3-oxobutyl phosphate and 5-amino-6-(D-ribitylamino)uracil: step 2/2. HAMAP MF_00178
Sequence similarities	Belongs to the DMRL synthase family.

Ontologies

Keywords
Biological process	Riboflavin biosynthesis
Molecular function	Transferase
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	riboflavin biosynthetic process Inferred from electronic annotation. Source: UniProtKB-KW
Cellular component	riboflavin synthase complex Inferred from electronic annotation. Source: InterPro
Molecular function	riboflavin synthase activity Inferred from electronic annotation. Source: EC
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 155	155	6,7-dimethyl-8-ribityllumazine synthase HAMAP MF_00178		PRO_1000040396

Sequences

	Sequence		Length	Mass (Da)
	Q3AUB5 [UniParc]. Last modified November 22, 2005. Version 1. Checksum: AFE53AB3202F8CBD	FASTA	155	16,601
	10 20 30 40 50 60 MHIEQIEGTL SAAGMRIALV VSRFNDFIGQ KLVEGAVDCI RRHGGSEEQM AIYRCPGAFE 70 80 90 100 110 120 LPMVSKKAAL SGKYDAVIAL GVIIRGSTPH FDVIAAEATK GIAQASLETM IPIAFGVLTT 130 140 150 ENLEQAIERA GTKAGNKGFD AAMTAIEMVN LYRQM

References

[1]

"Complete sequence of Chlorobium chlorochromatii CaD3." Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T., Hammon N., Israni S., Pitluck S., Bryant D., Schmutz J., Larimer F., Land M., Kyrpides N., Ivanova N., Richardson P. Submitted (AUG-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: CaD3.

Cross-references

Sequence databases
EMBL GenBank DDBJ	CP000108 Genomic DNA. Translation: ABB27410.1.
RefSeq	YP_378453.1. NC_007514.1.
3D structure databases
ProteinModelPortal	Q3AUB5.
SMR	Q3AUB5. Positions 4-155.
ModBase	Search...
Protein-protein interaction databases
STRING	Q3AUB5.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
GeneID	3747178.
GenomeReviews	Gene locus Cag_0132 in contig CP000108_GR.
KEGG	cch:Cag_0132.
PATRIC	21367813. VBIChlChl46571_0140.
Organism-specific databases
CMR	Search...
Phylogenomic databases
eggNOG	COG0054.
HOGENOM	HBG311126.
OMA	DYVCNEA.
PhylomeDB	Q3AUB5.
ProtClustDB	PRK00061.
Enzyme and pathway databases
BioCyc	CCHL340177:CAG_0132-MONOMER.
Family and domain databases
HAMAP	MF_00178. Lumazine_synth. [Tree]
InterPro	IPR002180. DMRL_synthase. [Graphical view]
Gene3D	G3DSA:3.40.50.960. DMRL_synthase. 1 hit.
KO	K00794.
PANTHER	PTHR21058. DMRL_synthase. 1 hit.
Pfam	PF00885. DMRL_synthase. 1 hit. [Graphical view]
SUPFAM	SSF52121. DMRL_synthase. 1 hit.
TIGRFAMs	TIGR00114. Lumazine-synth. 1 hit.
ProtoNet	Search...

Entry information

Entry name

RISB_CHLCH

Accession

Primary (citable) accession number: Q3AUB5

Entry history

Integrated into UniProtKB/Swiss-Prot:	January 15, 2008
Last sequence update:	November 22, 2005
Last modified:	January 25, 2012
This is version 45 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program