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

Other original publications

Erin Treece, Andrew Pinkham, Thomas Kim
Aminoguanidine down-regulates the expression of mreB-like protein in Bacillus subtilis.
Curr Microbiol: 2012, 64(2);112-7
[PubMed:22048160] [WorldCat.org] [DOI] (I p)

Hervé Joël Defeu Soufo, Peter L Graumann
Bacillus subtilis MreB paralogues have different filament architectures and lead to shape remodelling of a heterologous cell system.
Mol Microbiol: 2010, 78(5);1145-58
[PubMed:21091501] [WorldCat.org] [DOI] (I p)

Irnov Irnov, Cynthia M Sharma, Jörg Vogel, Wade C Winkler
Identification of regulatory RNAs in Bacillus subtilis.
Nucleic Acids Res: 2010, 38(19);6637-51
[PubMed:20525796] [WorldCat.org] [DOI] (I p)

Yoshikazu Kawai, Kei Asai, Jeffery Errington
Partial functional redundancy of MreB isoforms, MreB, Mbl and MreBH, in cell morphogenesis of Bacillus subtilis.
Mol Microbiol: 2009, 73(4);719-31
[PubMed:19659933] [WorldCat.org] [DOI] (I p)

Kathrin Schirner, Jeff Errington
Influence of heterologous MreB proteins on cell morphology of Bacillus subtilis.
Microbiology (Reading): 2009, 155(Pt 11);3611-3621
[PubMed:19643765] [WorldCat.org] [DOI] (I p)

Kathrin Schirner, Jeff Errington
The cell wall regulator {sigma}I specifically suppresses the lethal phenotype of mbl mutants in Bacillus subtilis.
J Bacteriol: 2009, 191(5);1404-13
[PubMed:19114499] [WorldCat.org] [DOI] (I p)

Rut Carballido-López, Alex Formstone, Ying Li, S Dusko Ehrlich, Philippe Noirot, Jeff Errington
Actin homolog MreBH governs cell morphogenesis by localization of the cell wall hydrolase LytE.
Dev Cell: 2006, 11(3);399-409
[PubMed:16950129] [WorldCat.org] [DOI] (P p)

Kittichoat Tiyanont, Thierry Doan, Michael B Lazarus, Xiao Fang, David Z Rudner, Suzanne Walker
Imaging peptidoglycan biosynthesis in Bacillus subtilis with fluorescent antibiotics.
Proc Natl Acad Sci U S A: 2006, 103(29);11033-8
[PubMed:16832063] [WorldCat.org] [DOI] (P p)

Mark Leaver, Jeff Errington
Roles for MreC and MreD proteins in helical growth of the cylindrical cell wall in Bacillus subtilis.
Mol Microbiol: 2005, 57(5);1196-209
[PubMed:16101995] [WorldCat.org] [DOI] (P p)

Richard A Daniel, Jeff Errington
Control of cell morphogenesis in bacteria: two distinct ways to make a rod-shaped cell.
Cell: 2003, 113(6);767-76
[PubMed:12809607] [WorldCat.org] [DOI] (P p)

Rut Carballido-López, Jeff Errington
The bacterial cytoskeleton: in vivo dynamics of the actin-like protein Mbl of Bacillus subtilis.
Dev Cell: 2003, 4(1);19-28
[PubMed:12530960] [WorldCat.org] [DOI] (P p)

L J Jones, R Carballido-López, J Errington
Control of cell shape in bacteria: helical, actin-like filaments in Bacillus subtilis.
Cell: 2001, 104(6);913-22
[PubMed:11290328] [WorldCat.org] [DOI] (P p)

A Decatur, M T McMurry, B N Kunkel, R Losick
Translation of the mRNA for the sporulation gene spoIIID of Bacillus subtilis is dependent upon translation of a small upstream open reading frame.
J Bacteriol: 1997, 179(4);1324-8
[PubMed:9023218] [WorldCat.org] [DOI] (P p)

Y Abhayawardhane, G C Stewart
Bacillus subtilis possesses a second determinant with extensive sequence similarity to the Escherichia coli mreB morphogene.
J Bacteriol: 1995, 177(3);765-73
[PubMed:7836311] [WorldCat.org] [DOI] (P p)