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: Sugar catabolism, 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

• UniProt: 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

Birgit Voigt, Haike Antelmann, Dirk Albrecht, Armin Ehrenreich, Karl-Heinz Maurer, Stefan Evers, Gerhard Gottschalk, Jan Maarten van Dijl, Thomas Schweder, Michael Hecker
Cell physiology and protein secretion of Bacillus licheniformis compared to Bacillus subtilis.
J Mol Microbiol Biotechnol: 2009, 16(1-2);53-68
[PubMed:18957862] [WorldCat.org] [DOI] (I p)

A M Crutz, M Steinmetz, S Aymerich, R Richter, D Le Coq
Induction of levansucrase in Bacillus subtilis: an antitermination mechanism negatively controlled by the phosphotransferase system.
J Bacteriol: 1990, 172(2);1043-50
[PubMed:2105292] [WorldCat.org] [DOI] (P p)

H Shimotsu, D J Henner
Modulation of Bacillus subtilis levansucrase gene expression by sucrose and regulation of the steady-state mRNA level by sacU and sacQ genes.
J Bacteriol: 1986, 168(1);380-8
[PubMed:2428811] [WorldCat.org] [DOI] (P p)

P Gay, D Le Coq, M Steinmetz, E Ferrari, J A Hoch
Cloning structural gene sacB, which codes for exoenzyme levansucrase of Bacillus subtilis: expression of the gene in Escherichia coli.
J Bacteriol: 1983, 153(3);1424-31
[PubMed:6402497] [WorldCat.org] [DOI] (P p)