SsbA

• Description: single-strand DNA-binding protein, part of the replisome
  
  

Gene name	ssbA
Synonyms	ssb
Essential	yes PubMed
Product	single-strand DNA-binding protein
Function	DNA replication, DNA repair/ recombination
Interactions involving this protein in SubtInteract: SsbA
MW, pI	18 kDa, 4.822
Gene length, protein length	516 bp, 172 aa
Immediate neighbours	rpsR, rpsF
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

Categories containing this gene/protein

DNA replication, DNA repair/ recombination, essential genes, phosphoproteins

This gene is a member of the following regulons

ComK regulon, stringent response

The gene

Basic information

• Locus tag: BSU40900

Phenotypes of a mutant

essential PubMed

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:
  • SsbA inhibits ssDNA phosphorylase activity of PnpA PubMed
  • SsbA co-assembles onto SsbB-coated ssDNA PubMed

• Protein family:

• Paralogous protein(s): SsbB

Extended information on the protein

• Kinetic information:

• Domains:

• Modification: phosphorylated on Tyr-82 by PtkA, dephosphorylated by PtpZ PubMed

• Cofactor(s):

• Effectors of protein activity: Phosphorylation of Ssb increases binding to single-stranded DNA in vitro almost 200-fold PubMed

• Interactions:
  • forms tetramers PubMed
  • part of the replisome: PolC-HolA-HolB-DnaX-DnaN-DnaG-DnaC-DnaI-DnaD-SsbA-DnaE-PriA-DnaB PubMed
  • SsbA-SbcC PubMed
  • SsbA-RecG PubMed
  • SsbA-YrvE PubMed
  • SsbA-YrvN PubMed
  • SsbA (bound to ssDNA) -RecO, this helps to dislodge SsbA and SsbB from ssDNA PubMed
  • SsbA-YqiB PubMed
  • SsbA-Ung PubMed
  • SsbA-YpbB PubMed
  • SsbA-YrrC PubMed
  • DnaE-DnaN PubMed

• Localization:
  • forms foci PubMed
  • Nucleoid (Mid-cell) PubMed

Database entries

• Structure: 3VDY 3VDY (SsbB in complex with ssDNA, 63% identity, 87% similarity) PubMed

• UniProt: P37455

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: yyaF-rpsF-ssbA-rpsR PubMed

• Expression browser: ssbA PubMed

• Sigma factor:

• Regulation:
  • RelA dependent downregulation (Class I) during stringent response PubMed
  • ComK: transcription activation PubMed

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

References

Additional publications: PubMed

Tribhuwan Yadav, Begoña Carrasco, Angela R Myers, Nicholas P George, James L Keck, Juan C Alonso
Genetic recombination in Bacillus subtilis: a division of labor between two single-strand DNA-binding proteins.
Nucleic Acids Res: 2012, 40(12);5546-59
[PubMed:22373918] [WorldCat.org] [DOI] (I p)

Wei Zhang, Xiujuan Lü, Wenke Zhang, Jiacong Shen
EMSA and single-molecule force spectroscopy study of interactions between Bacillus subtilis single-stranded DNA-binding protein and single-stranded DNA.
Langmuir: 2011, 27(24);15008-15
[PubMed:22054219] [WorldCat.org] [DOI] (I p)

Candela Manfredi, Yuki Suzuki, Tribhuwan Yadav, Kunio Takeyasu, Juan C Alonso
RecO-mediated DNA homology search and annealing is facilitated by SsbA.
Nucleic Acids Res: 2010, 38(20);6920-9
[PubMed:20581116] [WorldCat.org] [DOI] (I p)

Glenn M Sanders, H Garry Dallmann, Charles S McHenry
Reconstitution of the B. subtilis replisome with 13 proteins including two distinct replicases.
Mol Cell: 2010, 37(2);273-81
[PubMed:20122408] [WorldCat.org] [DOI] (I p)

Dawit Kidane, Begoña Carrasco, Candela Manfredi, Katharina Rothmaier, Silvia Ayora, Serkalem Tadesse, Juan C Alonso, Peter L Graumann
Evidence for different pathways during horizontal gene transfer in competent Bacillus subtilis cells.
PLoS Genet: 2009, 5(9);e1000630
[PubMed:19730681] [WorldCat.org] [DOI] (I p)

François Lecointe, Céline Sérèna, Marion Velten, Audrey Costes, Stephen McGovern, Jean-Christophe Meile, Jeffrey Errington, S Dusko Ehrlich, Philippe Noirot, Patrice Polard
Anticipating chromosomal replication fork arrest: SSB targets repair DNA helicases to active forks.
EMBO J: 2007, 26(19);4239-51
[PubMed:17853894] [WorldCat.org] [DOI] (P p)

Ivan Mijakovic, Dina Petranovic, Boris Macek, Tina Cepo, Matthias Mann, Julian Davies, Peter R Jensen, Dusica Vujaklija
Bacterial single-stranded DNA-binding proteins are phosphorylated on tyrosine.
Nucleic Acids Res: 2006, 34(5);1588-96
[PubMed:16549871] [WorldCat.org] [DOI] (I e)

Jean-Christophe Meile, Ling Juan Wu, S Dusko Ehrlich, Jeff Errington, Philippe Noirot
Systematic localisation of proteins fused to the green fluorescent protein in Bacillus subtilis: identification of new proteins at the DNA replication factory.
Proteomics: 2006, 6(7);2135-46
[PubMed:16479537] [WorldCat.org] [DOI] (P p)

Cordula Lindner, Reindert Nijland, Mariska van Hartskamp, Sierd Bron, Leendert W Hamoen, Oscar P Kuipers
Differential expression of two paralogous genes of Bacillus subtilis encoding single-stranded DNA binding protein.
J Bacteriol: 2004, 186(4);1097-105
[PubMed:14762004] [WorldCat.org] [DOI] (P p)

Christine Eymann, Georg Homuth, Christian Scharf, Michael Hecker
Bacillus subtilis functional genomics: global characterization of the stringent response by proteome and transcriptome analysis.
J Bacteriol: 2002, 184(9);2500-20
[PubMed:11948165] [WorldCat.org] [DOI] (P p)

Mitsuo Ogura, Hirotake Yamaguchi, Kazuo Kobayashi, Naotake Ogasawara, Yasutaro Fujita, Teruo Tanaka
Whole-genome analysis of genes regulated by the Bacillus subtilis competence transcription factor ComK.
J Bacteriol: 2002, 184(9);2344-51
[PubMed:11948146] [WorldCat.org] [DOI] (P p)