TrpB

• Description: tryptophan synthase (beta subunit)
  
  

Gene name	trpB
Synonyms
Essential	no
Product	tryptophan synthase (beta subunit)
Function	biosynthesis of tryptophan
Gene expression levels in SubtiExpress: trpB
Interactions involving this protein in SubtInteract: TrpB
Metabolic function and regulation of this protein in SubtiPathways: Phe, Tyr, Trp
MW, pI	43 kDa, 5.526
Gene length, protein length	1200 bp, 400 aa
Immediate neighbours	trpA, trpF
Sequences	Protein DNA DNA_with_flanks
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed 500px

Categories containing this gene/protein

biosynthesis/ acquisition of amino acids

This gene is a member of the following regulons

TRAP regulon

The gene

Basic information

• Locus tag: BSU22640

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: L-serine + 1-C-(indol-3-yl)glycerol 3-phosphate = L-tryptophan + glyceraldehyde 3-phosphate + H₂O (according to Swiss-Prot)

• Protein family:

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions: TrpA-TrpB

• Localization:

Database entries

• Structure:

• UniProt: P07600

• KEGG entry: [3]

• E.C. number: 4.2.1.20

Expression and regulation

• Operon:
  • aroF-aroB-aroH-trpE-trpD-trpC-trpF-trpB-trpA-hisC-tyrA-aroE (according to DBTBS)
  • trpE-trpD-trpC-trpF-trpB-trpA-hisC-tyrA-aroE PubMed

• Expression browser: trpB PubMed

• Sigma factor:
  • trpE: SigA PubMed

• Regulation:
  • induction by tryptophan (TRAP) PubMed

• Regulatory mechanism:
  • TRAP: binding to the mRNA in the presence of tryptophan, this results in transcription termination PubMed

• Additional information:
  • the mRNA is substantially stabilized upon depletion of RNase Y PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

References

Reviews

Samanta Raboni, Stefano Bettati, Andrea Mozzarelli
Tryptophan synthase: a mine for enzymologists.
Cell Mol Life Sci: 2009, 66(14);2391-403
[PubMed:19387555] [WorldCat.org] [DOI] (I p)

Michael F Dunn, Dimitri Niks, Huu Ngo, Thomas R M Barends, Ilme Schlichting
Tryptophan synthase: the workings of a channeling nanomachine.
Trends Biochem Sci: 2008, 33(6);254-64
[PubMed:18486479] [WorldCat.org] [DOI] (P p)

E W Miles
Tryptophan synthase: a multienzyme complex with an intramolecular tunnel.
Chem Rec: 2001, 1(2);140-51
[PubMed:11893063] [WorldCat.org] [DOI] (P p)

N K Nagradova
Interdomain interactions in oligomeric enzymes: creation of asymmetry in homo-oligomers and role in metabolite channeling between active centers of hetero-oligomers.
FEBS Lett: 2001, 487(3);327-32
[PubMed:11163353] [WorldCat.org] [DOI] (P p)

E W Miles
Tryptophan synthase. Structure, function, and protein engineering.
Subcell Biochem: 1995, 24;207-54
[PubMed:7900177] [WorldCat.org] (P p)

Original publications

Lehnik-Habrink M, Schaffer M, Mäder U, Diethmaier C, Herzberg C, Stülke J  
RNA processing in Bacillus subtilis: identification of targets of the essential RNase Y. 
Mol Microbiol. 2011 81(6): 1459-1473. 
PubMed:21815947