Reviewed, UniProtKB/Swiss-Prot Q8A6M0 (LEU3_BACTN)

Names and origin

Protein names

Recommended name:
    3-isopropylmalate dehydrogenase
    EC=1.1.1.85
Alternative name(s):
    Beta-IPM dehydrogenase
      Short name=IMDH
    3-IPM-DH

Gene names

Name:	leuB
Ordered Locus Names:	BT_1857

Organism

Bacteroides thetaiotaomicron [Complete proteome] [HAMAP]

Taxonomic identifier

818 [NCBI]

Taxonomic lineage

Bacteria › Bacteroidetes › Bacteroidia › Bacteroidales › Bacteroidaceae › Bacteroides

Protein attributes

Sequence length	353 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Inferred from homology.

General annotation (Comments)

Function	Catalyzes the oxidation of 3-carboxy-2-hydroxy-4-methylpentanoate (3-isopropylmalate) to 3-carboxy-4-methyl-2-oxopentanoate. The product decarboxylates to 4-methyl-2 oxopentanoate.
Catalytic activity	(2R,3S)-3-isopropylmalate + NAD(+) = 4-methyl-2-oxopentanoate + CO(2) + NADH.
Cofactor	Binds 1 magnesium or manganese ion per subunit By similarity.
Pathway	Amino-acid biosynthesis; L-leucine biosynthesis; L-leucine from 3-methyl-2-oxobutanoate: step 3/4.
Subunit structure	Homodimer By similarity.
Subcellular location	CytoplasmBy similarity.
Sequence similarities	Belongs to the isocitrate and isopropylmalate dehydrogenases family. LeuB type 1 subfamily.

Ontologies

Keywords
Biological process	Amino-acid biosynthesis Branched-chain amino acid biosynthesis Leucine biosynthesis
Cellular component	Cytoplasm
Ligand	Magnesium Manganese Metal-binding NAD
Molecular function	Oxidoreductase
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	leucine biosynthetic process Inferred from electronic annotation. Source: HAMAP oxidation reduction Inferred from electronic annotation. Source: UniProtKB-KW
Cellular component	cytoplasm Inferred from electronic annotation. Source: HAMAP
Molecular function	3-isopropylmalate dehydrogenase activity Inferred from electronic annotation. Source: HAMAP magnesium ion binding Inferred from electronic annotation. Source: UniProtKB-KW manganese ion binding Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 353	353	3-isopropylmalate dehydrogenase		PRO_0000083646
Sites
	Metal binding	219	1	Magnesium or manganese By similarity
	Metal binding	243	1	Magnesium or manganese By similarity
	Metal binding	247	1	Magnesium or manganese By similarity
	Binding site	97	1	Substrate By similarity
	Binding site	107	1	Substrate By similarity
	Binding site	135	1	Substrate By similarity
	Binding site	219	1	Substrate By similarity
	Site	142	1	Important for catalysis By similarity
	Site	187	1	Important for catalysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q8A6M0-1 [UniParc]. Last modified June 1, 2003. Version 1. Checksum: 9D6A32F7EBB2B077	FASTA	353	39,179
	10 20 30 40 50 60 MDFKIAVLAG DGIGPEISVQ GVDVMSAVCE KFGHKVSYEY AICGADAIDK VGDPFPEETY 70 80 90 100 110 120 EVCKNADAVL FSAVGDPKFD NDPTAKVRPE QGLLAMRKKL GLFANIRPVQ TFKCLIHKSP 130 140 150 160 170 180 LRAELVENAD FICIRELTGG MYFGEKYQDN DKAYDTNYYT RPEIERILKV AFEYAMKRRK 190 200 210 220 230 240 HLTVVDKANV LASSRLWRQI AQEMAPNYPE VTTDYMFVDN AAMKMIQEPA FFDVMVTENT 250 260 270 280 290 300 FGDILTDEGS VISGSMGLLP SASTGESTPV FEPIHGSWPQ AKGLNIANPL AQILSVAMLF 310 320 330 340 350 EYFDCKEEGA LIRKAVDASL DENVRTPEIQ VADGAKYGTK EVGQWIVDYI KKA

References

[1]

"A genomic view of the human-Bacteroides thetaiotaomicron symbiosis." Xu J., Bjursell M.K., Himrod J., Deng S., Carmichael L.K., Chiang H.C., Hooper L.V., Gordon J.I. Science 299:2074-2076(2003) [PubMed: 12663928] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482.

Cross-references

Sequence databases
EMBLGenBankDDBJ	AE015928 Genomic DNA. Translation: AAO76964.1.
RefSeq	NP_810770.1.
3D structure databases
HSSP	HSSP built from PDB template 2AYQ based on UniProtKB P12010.
ModBase	Search...
Genome annotation databases
GeneID	1075934.
GenomeReviews	Gene locus BT_1857 in contig AE015928_GR.
KEGG	bth:BT_1857.
NMPDR	fig|226186.1.peg.1857.
Organism-specific databases
CMR	Search...
Phylogenomic databases
HOGENOM	Q8A6M0.
Enzyme and pathway databases
BioCyc	BTHE226186:BT_1857-MON.
Family and domain databases
HAMAP	MF_01033. [Tree]
InterPro	IPR004429. 3-isopropylmalate_DHase. IPR001804. IsoCit_IM_DHase. [Graphical view]
Gene3D	G3DSA:3.40.718.10. IDH_IMDH. 1 hit.
PANTHER	PTHR11835. IDH_IMDH_dimeric. 1 hit. PTHR11835:SF13. IPMDH. 1 hit.
Pfam	PF00180. Iso_dh. 1 hit. [Graphical view]
TIGRFAMs	TIGR00169. leuB. 1 hit.
PROSITE	PS00470. IDH_IMDH. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

LEU3_BACTN

Accession

Primary (citable) accession number: Q8A6M0

Entry history

Integrated into UniProtKB/Swiss-Prot:	December 15, 2003
Last sequence update:	June 1, 2003
Last modified:	November 4, 2008
This is version 46 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

HAMAP (High-quality Automated and Manual Annotation of microbial Proteomes)