Mbl

• Description: cell shape-determining protein, forms filaments, the polymers control/restrict the mobility of the cell wall elongation enzyme complex
  
  

Gene name	mbl
Synonyms
Essential	no
Product	MreB-like protein
Function	cell shape determination
Interactions involving this protein in SubtInteract: Mbl
MW, pI	35 kDa, 5.669
Gene length, protein length	999 bp, 333 aa
Immediate neighbours	flhO, spoIIID
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

Categories containing this gene/protein

cell shape, sporulation proteins, membrane proteins

This gene is a member of the following regulons

SigE regulon, stringent response

The gene

Basic information

• Locus tag: BSU36410

Phenotypes of a mutant

non-viable in the presence of low Mg(2+), readily accumulate rsgI suppressor mutants PubMed

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:
  • forms helical filaments in a heterologous system PubMed

• Protein family: ftsA/mreB family (according to Swiss-Prot)

• Paralogous protein(s): MreB, MreBH

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:
  • part of the cell wall biosynthetic complex PubMed
  • MreB-Mbl PubMed
  • Mbl-MreBH PubMed

• Localization:
  • during logarithmic growth, Mbl forms discrete patches thst move processively along peripheral tracks perpendicular to the cell axis PubMed
  • forms transverse bands as cells enter the stationary phase PubMed
  • close to the inner surface of the cytoplasmic membrane PubMed
  • reports on helical structures formed by Mbl PubMed seem to be misinterpretation of data PubMed

Database entries

• Structure:

• UniProt: P39751

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: usd-spoIIID-mbl-flhO-flhP PubMed

• Sigma factor: SigE PubMed

• Regulation:
  • expressed early during sporulation in the mother cell (SigE) PubMed
  • RelA dependent downregulation (Class I) during stringent response PubMed
  • expression is strongly repressed in the presence of aminoguanidine (inhibitor of nitric oxide synthase) PubMed

• Regulatory mechanism:

• Additional information:
  • An antisense RNA is predicted for mbl PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system: B. pertussis adenylate cyclase-based bacterial two hybrid system (BACTH), available in Görke lab

• Antibody: available in the Jeff Errington and Peter Graumann labs

Labs working on this gene/protein

Peter Graumann, Freiburg University, Germany homepage

References

Localization

Ethan C Garner, Remi Bernard, Wenqin Wang, Xiaowei Zhuang, David Z Rudner, Tim Mitchison
Coupled, circumferential motions of the cell wall synthesis machinery and MreB filaments in B. subtilis.
Science: 2011, 333(6039);222-5
[PubMed:21636745] [WorldCat.org] [DOI] (I p)

Julia Domínguez-Escobar, Arnaud Chastanet, Alvaro H Crevenna, Vincent Fromion, Roland Wedlich-Söldner, Rut Carballido-López
Processive movement of MreB-associated cell wall biosynthetic complexes in bacteria.
Science: 2011, 333(6039);225-8
[PubMed:21636744] [WorldCat.org] [DOI] (I p)

Henrik Strahl, Leendert W Hamoen
Membrane potential is important for bacterial cell division.
Proc Natl Acad Sci U S A: 2010, 107(27);12281-6
[PubMed:20566861] [WorldCat.org] [DOI] (I p)

Hervé Joël Defeu Soufo, Peter L Graumann
Dynamic localization and interaction with other Bacillus subtilis actin-like proteins are important for the function of MreB.
Mol Microbiol: 2006, 62(5);1340-56
[PubMed:17064365] [WorldCat.org] [DOI] (P p)