Spx

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  • Description: transcriptional regulator Spx, involved in regulation of many genes.

Gene name spx
Synonyms yjbD
Essential no
Product transcriptional regulator Spx
Function negative and positive regulator of many genes
Interactions involving this protein in SubtInteract: Spx
Metabolic function and regulation of this protein in SubtiPathways:
Riboflavin / FAD
MW, pI 15,5 kDa, 7.80
Gene length, protein length 393 bp, 131 amino acids
Immediate neighbours yjbC, yjbE
Get the DNA and protein sequences
(Barbe et al., 2009)
Genetic context
Spx context.gif
This image was kindly provided by SubtiList








Categories containing this gene/protein

transcription factors and their control, general stress proteins (controlled by SigB), cell envelope stress proteins (controlled by SigM, V, W, X, Y)

This gene is a member of the following regulons

PerR regulon, SigB regulon, SigM regulon, SigW regulon, SigX regulon

The Spx regulon

The gene

Basic information

  • Locus tag: BSU11500

Phenotypes of a mutant

Loss of up-regulation of the methionine sulfoxide reductase (msrA-msrB) operon in response to thiol specific oxidative stress, also loss of trxA and trxB upregulation in response to thiol specific oxidative stress.

Database entries

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

Additional information

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity:
    • transcriptional regulator of many genes in response to thiol specific oxidative stress (transcription activator of trxA and trxB)
    • in addition, Spx inhibits transcription by binding to the C-terminal domain of the alpha subunit of RNAP (RpoA), disrupting complex formation between RNAP and certain transcriptional activator proteins like ResD and ComA
    • in response to thiol specific oxidative stress, Spx can also activate transcription, making it a general regulator that exerts both positive and negative control over transcription initiation
    • involved in competence regulation PubMed
  • Protein family: Spx subfamily (according to Swiss-Prot) Arsenate Reductase (ArsC) family, Spx subfamily
  • Paralogous protein(s): MgsR

Extended information on the protein

  • Kinetic information:
  • Domains: CXXC (10-13): Acts as a disulfide switch for the redox-sensitive transcriptional regulation of genes that function in thiol homeostasis.
  • Modification: Cysteine oxidation of the CXXC motif
  • Cofactor(s):
  • Effectors of protein activity:

Database entries

  • Structure: 1Z3E complex with C-terminal domain of RpoA NCBI
  • KEGG entry: [2]
  • E.C. number:

Additional information

Expression and regulation

  • Regulatory mechanism: transcription repression
  • Additional information:
    • post-translational control by ClpX-ClpP: Spx naturally contains a C-terminal sequence that resembles the SsrA tag and targets the protein for degradation. PubMed
    • proteolysis is enhanced by YjbH PubMed and counter-acted by YirB PubMed
    • the mRNA is substantially stabilized upon depletion of RNase Y (the half-life of the monocistronic spx mRNA increases from 1 to 6 min) PubMed

Biological materials

  • Mutant: ORB6781 (spc), ORB6876 (tet), available in Zuber lab, also available in the Stülke lab
  • Expression vector:
  • lacZ fusion:
  • GFP fusion:
  • two-hybrid system: B. pertussis adenylate cyclase-based bacterial two hybrid system (BACTH), available in Stülke lab
  • Antibody:

Labs working on this gene/protein

Peter Zuber, Oregon Health and Science University, USA Homepage

Richard Brennan, Houston, Texas, USA Homepage

Your additional remarks

References

Reviews

Peter Zuber
Management of oxidative stress in Bacillus.
Annu Rev Microbiol: 2009, 63;575-97
[PubMed:19575568] [WorldCat.org] [DOI] (I p)

Additional reviews: PubMed

The Spx regulon

Structural analysis of Spx

Original Publications

Additional publications: PubMed 

Lehnik-Habrink M, Schaffer M, Mäder U, Diethmaier C, Herzberg C, Stülke J  
RNA processing in Bacillus subtilis: identification of targets of the essential RNase Y. 
Mol Microbiol. 2011 81(6): 1459-1473. 
PubMed:21815947

Michiko M Nakano, Ann Lin, Cole S Zuber, Kate J Newberry, Richard G Brennan, Peter Zuber
Promoter recognition by a complex of Spx and the C-terminal domain of the RNA polymerase alpha subunit.
PLoS One: 2010, 5(1);e8664
[PubMed:20084284] [WorldCat.org] [DOI] (I e)

Andriansjah Rukmana, Takuya Morimoto, Hiroki Takahashi, Giyanto, Naotake Ogasawara
Assessment of transcriptional responses of Bacillus subtilis cells to the antibiotic enduracidin, which interferes with cell wall synthesis, using a high-density tiling chip.
Genes Genet Syst: 2009, 84(4);253-67
[PubMed:20057163] [WorldCat.org] [DOI] (P p)

Saurabh K Garg, Sushma Kommineni, Luke Henslee, Ying Zhang, Peter Zuber
The YjbH protein of Bacillus subtilis enhances ClpXP-catalyzed proteolysis of Spx.
J Bacteriol: 2009, 191(4);1268-77
[PubMed:19074380] [WorldCat.org] [DOI] (I p)

Dindo Y Reyes, Peter Zuber
Activation of transcription initiation by Spx: formation of transcription complex and identification of a Cis-acting element required for transcriptional activation.
Mol Microbiol: 2008, 69(3);765-79
[PubMed:18687074] [WorldCat.org] [DOI] (I p)

CongHui You, Agnieszka Sekowska, Olivera Francetic, Isabelle Martin-Verstraete, YiPing Wang, Antoine Danchin
Spx mediates oxidative stress regulation of the methionine sulfoxide reductases operon in Bacillus subtilis.
BMC Microbiol: 2008, 8;128
[PubMed:18662407] [WorldCat.org] [DOI] (I e)

Falko Hochgräfe, Carmen Wolf, Stephan Fuchs, Manuel Liebeke, Michael Lalk, Susanne Engelmann, Michael Hecker
Nitric oxide stress induces different responses but mediates comparable protein thiol protection in Bacillus subtilis and Staphylococcus aureus.
J Bacteriol: 2008, 190(14);4997-5008
[PubMed:18487332] [WorldCat.org] [DOI] (I p)

Warawan Eiamphungporn, John D Helmann
The Bacillus subtilis sigma(M) regulon and its contribution to cell envelope stress responses.
Mol Microbiol: 2008, 67(4);830-48
[PubMed:18179421] [WorldCat.org] [DOI] (P p)

Jonas T Larsson, Annika Rogstam, Claes von Wachenfeldt
YjbH is a novel negative effector of the disulphide stress regulator, Spx, in Bacillus subtilis.
Mol Microbiol: 2007, 66(3);669-84
[PubMed:17908206] [WorldCat.org] [DOI] (P p)

Ying Zhang, Peter Zuber
Requirement of the zinc-binding domain of ClpX for Spx proteolysis in Bacillus subtilis and effects of disulfide stress on ClpXP activity.
J Bacteriol: 2007, 189(21);7669-80
[PubMed:17827297] [WorldCat.org] [DOI] (P p)

Adrian J Jervis, Penny D Thackray, Chris W Houston, Malcolm J Horsburgh, Anne Moir
SigM-responsive genes of Bacillus subtilis and their promoters.
J Bacteriol: 2007, 189(12);4534-8
[PubMed:17434969] [WorldCat.org] [DOI] (P p)

Montira Leelakriangsak, Kazuo Kobayashi, Peter Zuber
Dual negative control of spx transcription initiation from the P3 promoter by repressors PerR and YodB in Bacillus subtilis.
J Bacteriol: 2007, 189(5);1736-44
[PubMed:17158660] [WorldCat.org] [DOI] (P p)

Soon-Yong Choi, Dindo Reyes, Montira Leelakriangsak, Peter Zuber
The global regulator Spx functions in the control of organosulfur metabolism in Bacillus subtilis.
J Bacteriol: 2006, 188(16);5741-51
[PubMed:16885442] [WorldCat.org] [DOI] (P p)

Ying Zhang, Shunji Nakano, Soon-Yong Choi, Peter Zuber
Mutational analysis of the Bacillus subtilis RNA polymerase alpha C-terminal domain supports the interference model of Spx-dependent repression.
J Bacteriol: 2006, 188(12);4300-11
[PubMed:16740936] [WorldCat.org] [DOI] (P p)

Dirk Höper, Uwe Völker, Michael Hecker
Comprehensive characterization of the contribution of individual SigB-dependent general stress genes to stress resistance of Bacillus subtilis.
J Bacteriol: 2005, 187(8);2810-26
[PubMed:15805528] [WorldCat.org] [DOI] (P p)

Shunji Nakano, Kyle N Erwin, Martina Ralle, Peter Zuber
Redox-sensitive transcriptional control by a thiol/disulphide switch in the global regulator, Spx.
Mol Microbiol: 2005, 55(2);498-510
[PubMed:15659166] [WorldCat.org] [DOI] (P p)

Penny D Thackray, Anne Moir
SigM, an extracytoplasmic function sigma factor of Bacillus subtilis, is activated in response to cell wall antibiotics, ethanol, heat, acid, and superoxide stress.
J Bacteriol: 2003, 185(12);3491-8
[PubMed:12775685] [WorldCat.org] [DOI] (P p)

Shunji Nakano, Michiko M Nakano, Ying Zhang, Montira Leelakriangsak, Peter Zuber
A regulatory protein that interferes with activator-stimulated transcription in bacteria.
Proc Natl Acad Sci U S A: 2003, 100(7);4233-8
[PubMed:12642660] [WorldCat.org] [DOI] (P p)

Shunji Nakano, Guolu Zheng, Michiko M Nakano, Peter Zuber
Multiple pathways of Spx (YjbD) proteolysis in Bacillus subtilis.
J Bacteriol: 2002, 184(13);3664-70
[PubMed:12057962] [WorldCat.org] [DOI] (P p)

M M Nakano, F Hajarizadeh, Y Zhu, P Zuber
Loss-of-function mutations in yjbD result in ClpX- and ClpP-independent competence development of Bacillus subtilis.
Mol Microbiol: 2001, 42(2);383-94
[PubMed:11703662] [WorldCat.org] [DOI] (P p)

H Antelmann, C Scharf, M Hecker
Phosphate starvation-inducible proteins of Bacillus subtilis: proteomics and transcriptional analysis.
J Bacteriol: 2000, 182(16);4478-90
[PubMed:10913081] [WorldCat.org] [DOI] (P p)

A Petersohn, J Bernhardt, U Gerth, D Höper, T Koburger, U Völker, M Hecker
Identification of sigma(B)-dependent genes in Bacillus subtilis using a promoter consensus-directed search and oligonucleotide hybridization.
J Bacteriol: 1999, 181(18);5718-24
[PubMed:10482513] [WorldCat.org] [DOI] (P p)

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