Spo0A

• Description: phosphorelay regulator, initiation of sporulation, coordinates DNA replication and initiation of sporulation by binding to sites close to the oriC
  
  

Gene name	spo0A
Synonyms	spo0C, spo0G, spoIIL, sof-1
Essential	no
Product	phosphorelay response regulator
Function	initiation of sporulation
Gene expression levels in SubtiExpress: spo0A
Interactions involving this protein in SubtInteract: Spo0A
Metabolic function and regulation of this protein in SubtiPathways: spo0A
MW, pI	29 kDa, 5.989
Gene length, protein length	801 bp, 267 aa
Immediate neighbours	yqiG, spoIVB
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

transcription factors and their control, phosphorelay, biofilm formation, phosphoproteins

This gene is a member of the following regulons

SigH regulon, Spo0A regulon

The gene

Basic information

• Locus tag: BSU24220

Phenotypes of a mutant

• inactivation of spo0A restores beta-lactam resistance in a sigM mutant PubMed
• altered cell death pattern in colonies PubMed

Database entries

• BsubCyc: BSU24220

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:
  • activation of gene expression at the onset of sporulation (Spo0A regulon)
  • coordination between DNA replication and initiation of sporulation by binding to sites close to the oriC (this limits re-initiation of replication) PubMed

• Protein family:

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification: receives phosphorylation from Spo0B, dephosphorylation by Spo0E, direct phosphorylation by KinC upon potassium leakage PubMed

• Cofactor(s):

• Effectors of protein activity:
  • the phosphorylation state affects DNA binding activity
  • interaction with MecA inhibits the transcriptional activity of Spo0A∼P PubMed

• Interactions:
  • KinC-Spo0A PubMed
  • Spo0A-Spo0E PubMed
  • Spo0A-SigA PubMed
  • Spo0A-Spo0B
  • SinI-Spo0A PubMed
  • MecA-Spo0A PubMed

• Localization:

Database entries

• BsubCyc: BSU24220

• Structure: 1QMP (with phosphorylated aspartate, Geobacillus stearothermophilus), 1FC3 (trans-activation domain, Geobacillus stearothermophilus), 1LQ1 (complex with DNA)

• UniProt: P06534

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: spo0A PubMed

• Expression browser: spo0A PubMed

• Sigma factor: SigA PubMed, SigH PubMed

• Regulation:
  • repressed under conditions that trigger sporulation (Spo0A) PubMed
  • repressed by casamino acids PubMed
  • repressed by SinR overexpression PubMed
  • repressed by soj PubMed
  • expression increases when drowth rate declines PubMed

• Regulatory mechanism:
  • Spo0A: transcription repression PubMed
  • Spo0A synthesis is subject to a post-transcriptional control mechanism such that translation of mRNAs originating from the SigA-dependent promoter is impeded due to RNA secondary structure PubMed

• Additional information:
  • number of protein molecules per cell (minimal medium with glucose and ammonium, exponential phase): 394 PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium, early stationary phase after glucose exhaustion): 358 PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium, late stationary phase after glucose exhaustion): 1763 PubMed

Biological materials

• Mutant:
  • BKG9 (spo0A::aphA3), available in Jörg Stülke's lab
• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

Labs working on this gene/protein

• Tony Wilkinson, York University, U.K. homepage
• Imrich Barak, Slovak Academy of Science, Bratislava, Slovakia homepage
• Charles Moran, Emory University, NC, USA homepage