Difference between revisions of "CitB"

From SubtiWiki
Jump to: navigation, search
(Biological materials)
(Biological materials)
Line 147: Line 147:
** 1A999 ( ''citB''::''spec''), {{PubMed| }}, available at [http://pasture.asc.ohio-state.edu/BGSC/getdetail.cfm?bgscid=1A999&Search=1A999 BGSC]
** 1A999 ( ''citB''::''spec''), {{PubMed| }}, available at [http://pasture.asc.ohio-state.edu/BGSC/getdetail.cfm?bgscid=1A999&Search=1A999 BGSC]
* '''Expression vector:''' GP1439 (''citB''-''Strep'' ''(spc)''), purification from ''B. subtilis'', for [[SPINE]], available in [[Stülke]] lab
* '''Expression vector:
**''' GP1439 (''citB''-''Strep'' ''(spc)''), purification from ''B. subtilis'', for [[SPINE]], available in [[Stülke]] lab
**pGP1810 (for expression, purification in ''E. coli'' with N-terminal Strep-tag, in [[pGP172]], available in [[Stülke]] lab)
* '''lacZ fusion:'''  
* '''lacZ fusion:'''  
** pGP700 (in [[pAC5]]), available in [[Jörg Stülke]]'s lab
** pGP700 (in [[pAC5]]), available in [[Jörg Stülke]]'s lab

Revision as of 09:47, 2 November 2012

Gene name citB
Essential no
Product trigger enzyme: aconitate hydratase (aconitase)
Function TCA cycle
Gene expression levels in SubtiExpress: citB
Interactions involving this protein in SubtInteract: CitB
Metabolic function and regulation of this protein in SubtiPathways:
Central C-metabolism
MW, pI 99 kDa, 4.903
Gene length, protein length 2727 bp, 909 aa
Immediate neighbours sspO, yneN
Get the DNA and protein sequences
(Barbe et al., 2009)
Genetic context
CitB context.gif
This image was kindly provided by SubtiList
Expression at a glance   PubMed
CitB expression.png

Categories containing this gene/protein

carbon core metabolism, trigger enzyme, RNA binding regulators

This gene is a member of the following regulons

CcpC regulon, CodY regulon, FsrA regulon

The CitB regulon: feuA-feuB-feuC-ybbA

The gene

Basic information

  • Locus tag: BSU18000

Phenotypes of a mutant

glutamate auxotrophy and a defect in sporulation PubMed

Database entries

  • DBTBS entry: [1]
  • SubtiList entry: [2]

Additional information

  • A mutation was found in this gene after evolution under relaxed selection for sporulation PubMed

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity: Citrate = isocitrate (according to Swiss-Prot)
    • Binding to iron responsive elements (IRE RNA) in the absence of the FeS cluster PubMed
  • Protein family:
  • Paralogous protein(s):

Extended information on the protein

  • Kinetic information:
  • Domains:
  • Modification:
  • Cofactor(s): FeS cluster
  • Effectors of protein activity:

Database entries

  • Structure: 1L5J (E. coli)
  • KEGG entry: [3]

Additional information

  • B. subtilis aconitase is both an enzyme and an RNA binding protein (moonlighting protein) PubMed
  • extensive information on the structure and enzymatic properties of CitB can be found at Proteopedia

Expression and regulation

  • Regulation:
    • repressed during growth in the presence of branched chain amino acids (CodY) PubMed
    • repressed in the presence of glucose and glutamate (CcpC) PubMed
    • expressed upon transition into the stationary phase (AbrB) PubMed, indirect negative regulation by AbrB PubMed
    • repressed by glucose (3.7-fold) (CcpA) PubMed
    • repression by glucose + arginine (CcpC) PubMed
    • less expressed under conditions of extreme iron limitation (FsrA) PubMed
    • part of the iron sparing response (FsrA) PubMed
  • Additional information:

Biological materials

  • Expression vector:
    • GP1439 (citB-Strep (spc)), purification from B. subtilis, for SPINE, available in Stülke lab
    • pGP1810 (for expression, purification in E. coli with N-terminal Strep-tag, in pGP172, available in Stülke lab)
  • GFP fusion: GP1434 (spc, based on pGP1870), available in the Stülke lab
  • two-hybrid system: B. pertussis adenylate cyclase-based bacterial two hybrid system (BACTH), available in Jörg Stülke's lab

Labs working on this gene/protein

Linc Sonenshein, Tufts University, Boston, MA, USA Homepage

Jörg Stülke, University of Göttingen, Germany Homepage

Your additional remarks



Karl Volz
The functional duality of iron regulatory protein 1.
Curr. Opin. Struct. Biol.: 2008, 18(1);106-11
[PubMed:18261896] [WorldCat.org] [DOI] (P p)

Fabian M Commichau, Jörg Stülke
Trigger enzymes: bifunctional proteins active in metabolism and in controlling gene expression.
Mol. Microbiol.: 2008, 67(4);692-702
[PubMed:18086213] [WorldCat.org] [DOI] (P p)

Patricia J Kiley, Helmut Beinert
The role of Fe-S proteins in sensing and regulation in bacteria.
Curr. Opin. Microbiol.: 2003, 6(2);181-5
[PubMed:12732309] [WorldCat.org] (P p)

R L Switzer
Non-redox roles for iron-sulfur clusters in enzymes.
Biofactors: 1989, 2(2);77-86
[PubMed:2696478] [WorldCat.org] (P p)

Original publications