SacB

• Description: levansucrase
  
  

Gene name	sacB
Synonyms
Essential	no
Product	levansucrase
Function	utilization of sucrose, production of levan
Metabolic function and regulation of this protein in SubtiPathways: Stress
MW, pI	52 kDa, 6.175
Gene length, protein length	1419 bp, 473 aa
Immediate neighbours	pbpE, levB
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: BSU34450

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: Sucrose + (6)-beta-D-fructofuranosyl-(2->)(n) alpha-D-glucopyranoside = glucose + (6)-beta-D-fructofuranosyl-(2->)(n+1) alpha-D-glucopyranoside (according to Swiss-Prot)

• Protein family: glycosyl hydrolase 68 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: secreted (according to Swiss-Prot), extracellular (signal peptide) PubMed

Database entries

• Structure: 1PT2 (complex with sucrose), 1OYG

• Swiss prot entry: P05655

• KEGG entry: [3]

• E.C. number: 2.4.1.10

Expression and regulation

• Operon:

• Sigma factor: SigA

• Regulation: induction by sucrose (at high concentration)

• Regulatory mechanism: induction by SacY-dependent RNA switch (transcriptional antitermination), in addition activated by DegU-P

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

References

1. Voigt et al. (2009) Cell physiology and protein secretion of Bacillus licheniformis compared to Bacillus subtilis. J Mol Microbiol Biotechnol. 16: 53-68 PubMed
2. Crutz AM, Steinmetz M, Aymerich S, Richter R, Le Coq D (1990) Induction of levansucrase in Bacillus subtilis: an antitermination mechanism negatively controlled by the phosphotransferase system. J Bacteriol 172:1043-1050. PubMed
3. Author1, Author2 & Author3 (year) Title Journal volume: page-page. PubMed