O27443 (RISB_METTH) 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:	MTH_1390

Organism

Methanobacterium thermoautotrophicum (strain Delta H)

Taxonomic identifier

187420 [NCBI]

Taxonomic lineage

Archaea › Euryarchaeota › Methanobacteria › Methanobacteriales › Methanobacteriaceae › Methanothermobacter

Protein attributes

Sequence length	139 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 Reference 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 – 139	139	6,7-dimethyl-8-ribityllumazine synthase HAMAP MF_00178		PRO_0000134847

Sequences

	Sequence		Length	Mass (Da)
	O27443 [UniParc]. Last modified January 1, 1998. Version 1. Checksum: B640D8D12EE2A862	FASTA	139	15,464
	10 20 30 40 50 60 MKKVRIGAVV AEFNYDITHM MLELAKEHAR FLDAEITRVI AVPGVFDMPL AVKKLLLEDE 70 80 90 100 110 120 IDAVITLGAV IEGATDHDQI VVQHASRKIA DLALDYDKPV ALGISGPGMT RLEAHQRVDY 130 AKRAVEAAVK MYRRLKEDI

References

[1]

"Complete genome sequence of Methanobacterium thermoautotrophicum deltaH: functional analysis and comparative genomics." Smith D.R., Doucette-Stamm L.A., Deloughery C., Lee H.-M., Dubois J., Aldredge T., Bashirzadeh R., Blakely D., Cook R., Gilbert K., Harrison D., Hoang L., Keagle P., Lumm W., Pothier B., Qiu D., Spadafora R., Vicare R. , Wang Y., Wierzbowski J., Gibson R., Jiwani N., Caruso A., Bush D., Safer H., Patwell D., Prabhakar S., McDougall S., Shimer G., Goyal A., Pietrovski S., Church G.M., Daniels C.J., Mao J.-I., Rice P., Noelling J., Reeve J.N. J. Bacteriol. 179:7135-7155(1997) [PubMed: 9371463] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: Delta H.

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Additional computationally mapped references.

Cross-references

Sequence databases
EMBL GenBank DDBJ	AE000666 Genomic DNA. Translation: AAB85867.1.
PIR	A69052.
RefSeq	NP_276506.1. NC_000916.1.
3D structure databases
ProteinModelPortal	O27443.
ModBase	Search...
Protein-protein interaction databases
IntAct	O27443. 1 interaction.
STRING	O27443.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
GeneID	1471107.
GenomeReviews	Gene locus MTH_1390 in contig AE000666_GR.
KEGG	mth:MTH1390.
NMPDR	fig|187420.1.peg.1361.
Phylogenomic databases
eggNOG	arNOG09975.
HOGENOM	HBG311126.
OMA	IQGATKH.
PhylomeDB	O27443.
ProtClustDB	PRK00061.
Enzyme and pathway databases
BioCyc	MTHE187420:MTH1390-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_METTH

Accession

Primary (citable) accession number: O27443

Entry history

Integrated into UniProtKB/Swiss-Prot:	December 1, 2000
Last sequence update:	January 1, 1998
Last modified:	December 14, 2011
This is version 72 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program