Reviewed, UniProtKB/Swiss-Prot O31292 (LEU3_BUCTS)

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

Encoded on

Plasmid pBTs1

Organism

Buchnera aphidicola subsp. Thelaxes suberi

Taxonomic identifier

98797 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Enterobacteriales › Enterobacteriaceae › Buchnera

Protein attributes

Sequence length	364 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. HAMAP MF_01033
Catalytic activity	(2R,3S)-3-isopropylmalate + NAD+ = 4-methyl-2-oxopentanoate + CO2 + NADH. HAMAP MF_01033
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. HAMAP MF_01033
Subunit structure	Homodimer By similarity.
Subcellular location	Cytoplasm By 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	Plasmid
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: UniProtKB-SubCell
Molecular function	3-isopropylmalate dehydrogenase activity Inferred from electronic annotation. Source: HAMAP NAD or NADH binding Inferred from electronic annotation. Source: InterPro 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 – 364	364	3-isopropylmalate dehydrogenase HAMAP MF_01033		PRO_0000083662
Regions
	Nucleotide binding	79 – 92	14	NAD By similarity
	Nucleotide binding	285 – 297	13	NAD By similarity
Sites
	Metal binding	227	1	Magnesium or manganese By similarity
	Metal binding	251	1	Magnesium or manganese By similarity
	Metal binding	255	1	Magnesium or manganese By similarity
	Binding site	100	1	Substrate By similarity
	Binding site	110	1	Substrate By similarity
	Binding site	139	1	Substrate By similarity
	Binding site	227	1	Substrate By similarity
	Site	146	1	Important for catalysis By similarity
	Site	195	1	Important for catalysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	O31292-1 [UniParc]. Last modified January 1, 1998. Version 1. Checksum: D3EBFFE1DC07ACF2	FASTA	364	40,353
	10 20 30 40 50 60 MTKKLYKIAV LPGDGIGPEI IQEAYKIIDV LQKKFSFNVK MHEYDIGGIS IDKHGTALTQ 70 80 90 100 110 120 ETIEGCENSD AILFGSVGGS KWDHLPEIEK PEKAGLLKLR KHFNLFANIR PCKLSQHLLD 130 140 150 160 170 180 ISPLKNSIIK KGIDLICIRE LTGGIYFGKS NKITNIDDPY AFDTEIYFRS EIKRIAKIAF 190 200 210 220 230 240 QIAQSRKKKI VSIDKANVLK SSILWRDTVN KMAYKFPNVK LEHMYIDNAT MELIKNPSSF 250 260 270 280 290 300 DVILCSNLFG DIISDECAAI IGSIGLLPSA SLNKSGFGLY EPAGGSAPNI AGKTIANPIA 310 320 330 340 350 360 QILSLSMLLK YSLHLPFLSS CIDEAVHEAL VKKYMTMDIS KNPQNFLKTN EIGDKISDLL AKKA

References

[1]	"Putative evolutionary origin of plasmids carrying the genes involved in leucine biosynthesis in Buchnera aphidicola (endosymbiont of aphids)." van Ham R.C.H.J., Moya A., Latorre A. J. Bacteriol. 179:4768-4777(1997) [PubMed: 9244264] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	Y11966 Genomic DNA. Translation: CAA72702.1.
3D structure databases
HSSP	HSSP built from PDB template 1CNZ based on UniProtKB P37412.
ModBase	Search...
Family and domain databases
HAMAP	MF_01033. [Tree]
InterPro	IPR019818. IsoCit/isopropylmalate_DH_CS. IPR001804. Isocitrate/isopropylmalate_DH. IPR004429. Isopropylmalate_DH. [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_BUCTS

Accession

Primary (citable) accession number: O31292

Entry history

Integrated into UniProtKB/Swiss-Prot:	October 19, 2002
Last sequence update:	January 1, 1998
Last modified:	June 16, 2009
This is version 50 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)