SacB

• Description: levansucrase
  
  

Gene name	sacB
Synonyms
Essential	no
Product	levansucrase
Function	utilization of sucrose, production of levan
Gene expression levels in SubtiExpress: sacB
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
Sequences	Protein DNA DNA_with_flanks
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

utilization of specific carbon sources

This gene is a member of the following regulons

DegU regulon, SacY regulon

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: sacB-levB-yveA PubMed

• Expression browser: sacB PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • induction by sucrose (at high concentration) (SacY) PubMed

• Regulatory mechanism:
  • SacY: binding to a RNA switch (transcriptional antitermination) PubMed
  • DegU-P: transcription activation PubMed

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion: pGP564 (in pAC7), a series of RAT mutations in pAC7, all available in Stülke lab

• GFP fusion:

• two-hybrid system:

• Antibody:

References

Original publications

Clarita Olvera, Sara Centeno-Leija, Paulina Ruiz-Leyva, Agustín López-Munguía
Design of chimeric levansucrases with improved transglycosylation activity.
Appl Environ Microbiol: 2012, 78(6);1820-5
[PubMed:22247149] [WorldCat.org] [DOI] (I p)

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)

Kensuke Tsukahara, Mitsuo Ogura
Promoter selectivity of the Bacillus subtilis response regulator DegU, a positive regulator of the fla/che operon and sacB.
BMC Microbiol: 2008, 8;8
[PubMed:18197985] [WorldCat.org] [DOI] (I e)

Y Pereira, M F Petit-Glatron, R Chambert
yveB, Encoding endolevanase LevB, is part of the sacB-yveB-yveA levansucrase tricistronic operon in Bacillus subtilis.
Microbiology (Reading): 2001, 147(Pt 12);3413-9
[PubMed:11739774] [WorldCat.org] [DOI] (P 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)

S Aymerich, M Steinmetz
Cloning and preliminary characterization of the sacS locus from Bacillus subtilis which controls the regulation of the exoenzyme levansucrase.
Mol Gen Genet: 1987, 208(1-2);114-20
[PubMed:3039303] [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)