leuB

3-isopropylmalate dehydrogenase

locus: BSU_28270

pI: 4.74

mw: 39.79 kDa

protein length: 365 aa

gene length: 1098 bp

function: biosynthesis of leucine

product: 3-isopropylmalate dehydrogenase

essential: no

ec: 1.1.1.85

synonyms: leuC

Genomic Context

categories

• [category|SW 2|Metabolism] → [category|SW 2.3|Amino acid/ nitrogen metabolism] → [category|SW 2.3.1|Biosynthesis/ acquisition of amino acids] → [category|SW 2.3.1.12|Biosynthesis/ acquisition of branched-chain amino acids]
• [category|SW 6|Groups of genes] → [category|SW 6.4|Phosphoproteins] → [category|SW 6.4.1|Phosphorylation on an Arg residue]

Gene

Coordinates: 2,891,020 2,892,117

The protein

Catalyzed reaction/ biological activity

• (2R,3S)-3-isopropylmalate + NAD⁺ --> 4-methyl-2-oxopentanoate + CO₂ + NADH (according to UniProt)

Protein family

• Isocitrate and isopropylmalate dehydrogenases family (with [protein|CB7D0E32C044D541CD966DC1F9DA489D518A7703|Icd] and [protein|E9D1B04FCB24402B56DC6A6F7AD696209E4BD0FA|YcsA], according to UniProt)

Paralogous protein(s)

• [protein|E9D1B04FCB24402B56DC6A6F7AD696209E4BD0FA|YcsA]

Modification

• phosphorylated on Arg-4 [Pubmed|22517742]

Structure

• [PDB|1XAD] (Thermus thermophilus)

additional information

• belongs to the 100 [SW|most abundant proteins] [PubMed|15378759]

Expression and Regulation

Operons

• genes: [gene|E6EDDB6D1EDA85D73A0B78A656511D38346A625B|ilvB]-[gene|49E2D2EE480C2FFDED0C35E3AF0DBED5AD819B5F|ilvH]-[gene|EC1CB2FD563EFDA391D13EB8ADFDC8C9734E9D57|ilvC]-[gene|1502AED337F59DFFCEAFF68FE111C5AA6155701B|leuA]-[gene|105E3452D7F142A7D7616E35AF3FB753C9B63E38|leuB]-[gene|AC459429A9C50463FD947C1CF9EA919B6FE3B335|leuC]-[gene|0EB4C6EE398B14B9284FFAEDBC26C866CE2070D7|leuD]
  description: [Pubmed|1577690]

  sigma factors

  • [protein|360F48D576DE950DF79C1A2677B7A35A8D8CC30C|SigA]: sigma factor, [Pubmed|1577690], in [regulon|360F48D576DE950DF79C1A2677B7A35A8D8CC30C|SigA regulon]

  regulatory mechanism

  • [regulon|T-box|T-box]: termination/antitermination, via tRNA controlled [SW|RNA switch], repression by BCAA, in [regulon|T-box|T-box]
  • [protein|857EF1AC54DEA0690C01B7F8CEFFD16312C58F20|TnrA]: repression, [Pubmed|15547269], in [regulon|857EF1AC54DEA0690C01B7F8CEFFD16312C58F20|TnrA regulon]
  • [protein|90ACE0DECA58D3C1A55E135120F7A0C1C920571C|CodY]: repression, [pubmed|12618455] [pubmed|18083814], in [regulon|90ACE0DECA58D3C1A55E135120F7A0C1C920571C|CodY regulon]
  • [protein|E39AFEB7B7F28969A35C4B51CC6E7819F71C79D9|CcpA]: activation, [Pubmed|12193635], in [regulon|E39AFEB7B7F28969A35C4B51CC6E7819F71C79D9|CcpA regulon]

  regulation

  • expression is stimulated in the presence of glucose ([protein|E39AFEB7B7F28969A35C4B51CC6E7819F71C79D9|CcpA]) [PubMed|12193635]

  additional information

  • An [SW|ncRNA|antisense RNA] is predicted for [gene|1502AED337F59DFFCEAFF68FE111C5AA6155701B|leuA] [PubMed|20525796]
  • the [SW|T-box] RNA is degraded by [protein|872CCB5A49C9000BD95E4B0472556D5F60F7D7A4|RNase Y] [pubmed|29794222]

Biological materials

Mutant

• 1A618 ( ''leuB''::''erm''), [Pubmed|3015878], available at [http://pasture.asc.ohio-state.edu/BGSC/getdetail.cfm?bgscid=1A618&Search=1A618 BGSC]
• BKE28270 ([gene|105E3452D7F142A7D7616E35AF3FB753C9B63E38|leuB]::erm trpC2) available at [http://www.bgsc.org/getdetail.php?bgscid=BKE28270 BGSC], [Pubmed|28189581], upstream reverse: _UP1_CAAGTTAACCGTTCTCCTTT, downstream forward: _UP4_TGACAGCTTACGTTAAGCGG
• BKK28270 ([gene|105E3452D7F142A7D7616E35AF3FB753C9B63E38|leuB]::kan trpC2) available at [http://www.bgsc.org/getdetail.php?bgscid=BKK28270 BGSC], [Pubmed|28189581], upstream reverse: _UP1_CAAGTTAACCGTTCTCCTTT, downstream forward: _UP4_TGACAGCTTACGTTAAGCGG

References

• 15060025,12193635,19258532,8289305,18641142,22517742,15547269,12618455,12107147,20935095,25157083,24163341,25755103,15378759,26220295