Ptb

• Description: phosphate butyryltransferase
  
  

Gene name	ptb
Synonyms	yqiS, bkd
Essential	no
Product	phosphate butyryltransferase
Function	utilization of branched-chain keto acids
Metabolic function and regulation of this protein in SubtiPathways: Lipid synthesis, Ile, Leu, Val
MW, pI	31 kDa, 7.936
Gene length, protein length	897 bp, 299 aa
Immediate neighbours	bcd, bkdR
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

The gene

Basic information

• Locus tag: BSU24090

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

Categories containing this gene/protein

utilization of amino acids

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: Butanoyl-CoA + phosphate = CoA + butanoylphosphate (according to Swiss-Prot)

• Protein family: phosphate acetyltransferase and butyryltransferase family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:

• Localization:

Database entries

• Structure: 1YCO (from Enterococcus faecalis v583, 36% identity, 56% similarity)

• UniProt: P54530

• KEGG entry: [3]

• E.C. number: 2.3.1.19

Expression and regulation

• Operon: ptb-bcd-buk-lpdV-bkdAA-bkdAB-bkdB PubMed

• Sigma factor: SigL PubMed

• Regulation:
  • induced in the presence of isoleucine or valine (BkdR) PubMed

• Regulatory mechanism:
  • CodY: transcription repression PubMed
  • BkdR: transcription activation PubMed

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: