Tpi

• Description: triose phosphate isomerase, glycolytic/ gluconeogenic enzyme
  
  

Gene name	tpi
Synonyms	tpiA
Essential	no
Product	triosephosphate isomerase
Function	enzyme in glycolysis/ gluconeogenesis
Gene expression levels in SubtiExpress: tpi
Interactions involving this protein in SubtInteract: Tpi
Metabolic function and regulation of this protein in SubtiPathways: Central C-metabolism, Sugar catabolism
MW, pI	26,9 kDa, 4.79
Gene length, protein length	759 bp, 253 amino acids
Immediate neighbours	pgm, pgk
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

carbon core metabolism, phosphoproteins

This gene is a member of the following regulons

CggR regulon

The gene

Basic information

• Locus tag: BSU33920

Phenotypes of a mutant

• essential PubMed, non-essential according to 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: D-glyceraldehyde 3-phosphate = dihydroxyacetone phosphate (according to Swiss-Prot)

• Protein family: triosephosphate isomerase family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification: phosphorylation on Ser-213 PubMed

• Cofactor(s):

• Effectors of protein activity: inhibited by 2-phosphoglycolate (in B. stearothermophilus) PubMed

• Interactions:
  • Tkt-Tpi PubMed

• Localization:
  • cytoplasm PubMed

Database entries

• Structure: 1BTM (complex with 2-phosphoglycolic acid, Geobacillus stearothermophilus), complex with 2-phosphpoglycolic acid, Geobacillus stearothermophilus NCBI

• UniProt: P27876

• KEGG entry: [3]

• E.C. number: 5.3.1.1

Additional information

• extensive information on the structure and enzymatic properties of Tpi can be found at Proteopedia

Expression and regulation

• Operon:
  • cggR-gapA-pgk-tpiA-pgm-eno PubMed
  • pgk-tpiA-pgm-eno PubMed

• Expression browser: tpi PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • expression activated by glucose (3.3 fold) PubMed
  • cggR: induced by glycolytic substrates CggR PubMed
  • pgk: constitutive PubMed

• Regulatory mechanism: transcription repression by CggR PubMed

• Additional information:

Biological materials

• Mutant: GP700 (cat), available in Stülke lab

• Expression vector:
  • pGP394 (N-terminal His-tag, in pWH844), available in Stülke lab
  • pGP89 (N-terminal Strep-tag, for SPINE, expression in B. subtilis), available in Stülke lab
  • pGP1511 (expression in B. subtilis, in pBQ200), available in Stülke lab

• lacZ fusion:

• GFP fusion:

• two-hybrid system: B. pertussis adenylate cyclase-based bacterial two hybrid system (BACTH), available in Stülke lab

• Antibody: