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  • Description: transcriptional antiterminator for sacB and sacX-sacY (acts at high sucrose concentrations)

Gene name sacY
Synonyms ipa-13r, sacS
Essential no
Product transcriptional antiterminator
Function regulation of sucrose utilization
Metabolic function and regulation of this protein in SubtiPathways:
Sugar catabolism, Stress
MW, pI 32 kDa, 5.883
Gene length, protein length 840 bp, 280 aa
Immediate neighbours sacX, gspA
Get the DNA and protein sequences
(Barbe et al., 2009)
Genetic context
SacY context.gif
This image was kindly provided by SubtiList

The gene

Basic information

  • Locus tag: BSU38420

Phenotypes of a mutant

Database entries

  • DBTBS entry: [1]
  • SubtiList entry: [2]

Additional information

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity: binding to the mRNA of sacB and the sacX-sacY operon, causes transcription antitermination (in presence of sucrose)
  • Protein family: transcriptional antiterminator bglG family (according to Swiss-Prot) BglG family of antiterminators

Extended information on the protein

  • Kinetic information:
  • Domains:
  • Modification:
  • Cofactor(s):
  • Effectors of protein activity:
  • Localization:

Database entries

  • Structure: 1AUU (RNA-binding domain)
  • KEGG entry: [3]
  • E.C. number:

Additional information

Expression and regulation

  • Regulation: induction by sucrose (at high concentration)
  • Regulatory mechanism: induction by SacY-dependent RNA switch (transcriptional antitermination)
  • Additional information:

Biological materials

  • Mutant:
  • Expression vector:
  • lacZ fusion:
  • GFP fusion:
  • two-hybrid system:
  • Antibody:

Labs working on this gene/protein

Stephane Aymerich, Microbiology and Molecular Genetics, INRA Paris-Grignon, France

Your additional remarks


P Tortosa, N Declerck, H Dutartre, C Lindner, J Deutscher, D Le Coq
Sites of positive and negative regulation in the Bacillus subtilis antiterminators LicT and SacY.
Mol. Microbiol.: 2001, 41(6);1381-93
[PubMed:11580842] [] [DOI] (P p)

N Declerck, F Vincent, F Hoh, S Aymerich, H van Tilbeurgh
RNA recognition by transcriptional antiterminators of the BglG/SacY family: functional and structural comparison of the CAT domain from SacY and LicT.
J. Mol. Biol.: 1999, 294(2);389-402
[PubMed:10610766] [] [DOI] (P p)

H van Tilbeurgh, X Manival, S Aymerich, J M Lhoste, C Dumas, M Kochoyan
Crystal structure of a new RNA-binding domain from the antiterminator protein SacY of Bacillus subtilis.
EMBO J.: 1997, 16(16);5030-6
[PubMed:9305644] [] [DOI] (P p)

X Manival, Y Yang, M P Strub, M Kochoyan, M Steinmetz, S Aymerich
From genetic to structural characterization of a new class of RNA-binding domain within the SacY/BglG family of antiterminator proteins.
EMBO J.: 1997, 16(16);5019-29
[PubMed:9305643] [] [DOI] (P p)

P Tortosa, S Aymerich, C Lindner, M H Saier, J Reizer, D Le Coq
Multiple phosphorylation of SacY, a Bacillus subtilis transcriptional antiterminator negatively controlled by the phosphotransferase system.
J. Biol. Chem.: 1997, 272(27);17230-7
[PubMed:9202047] [] [DOI] (P p)

M Arnaud, M Débarbouillé, G Rapoport, M H Saier, J Reizer
In vitro reconstitution of transcriptional antitermination by the SacT and SacY proteins of Bacillus subtilis.
J. Biol. Chem.: 1996, 271(31);18966-72
[PubMed:8702561] [] [DOI] (P p)

S Aymerich, M Steinmetz
Specificity determinants and structural features in the RNA target of the bacterial antiterminator proteins of the BglG/SacY family.
Proc. Natl. Acad. Sci. U.S.A.: 1992, 89(21);10410-4
[PubMed:1279678] [] [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] [] [DOI] (P p)