SepF

• Description: part of the divisome, recruits FtsZ to the membrane
  
  

Gene name	sepF
Synonyms	ylmF
Essential	no
Product	FtsZ-interacting protein
Function	recruitment of FtsZ
Gene expression levels in SubtiExpress: sepF
Interactions involving this protein in SubtInteract: SepF
MW, pI	17 kDa, 4.863
Gene length, protein length	447 bp, 149 aa
Immediate neighbours	ylmE, ylmG
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

cell division, membrane proteins

This gene is a member of the following regulons

Spo0A regulon

The gene

Basic information

• Locus tag: BSU15390

Phenotypes of a mutant

• perturbation of the formation of properly formed division septa
• less efficient cell division results in longer cells. Electron microscopy reveals strongly distorted division septa.
• the sepF mutation in combination with a constitutively active form of WalR (WalR-R204C) results in the formation of cell wall-less L-forms PubMed
• the sepF mutation is synthetically lethal in combination with an ezrA mutation or an ftsA mutation PubMed

Database entries

• BsubCyc: BSU15390

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:
  • SepF assembles into very large (∼50 nm diameter) rings. These rings are able to bundle FtsZ protofilaments into strikingly long and regular tubular structures reminiscent of eukaryotic microtubules PubMed
  • SepF anchors FtsZ bundles to the membrane PubMed

• Protein family: sepF family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:
  • N-terminal amphipatic helix for membrane binding PubMed
  • C-terminal globular FtsZ-binding domain PubMed

• Modification:

• Cofactors:

• Effectors of protein activity:

• Interactions:
  • forms filaments that are made up of dimers PubMed
  • FtsZ (extreme C terminus of FtsZ)-SepF PubMed

• Localization:
  • septum PubMed
  • membrane PubMed

Database entries

• BsubCyc: BSU15390

• Structure:
  • 3ZIE (the FtsZ-binding C-terminal domain of Archaeoglobus fulgidus SepF) PubMed

• UniProt: O31728

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: ylmD-ylmE-sepF-ylmG-ylmH PubMed

• Expression browser: sepF PubMed

• Sigma factor:

• Regulation:
  • repressed under conditions that trigger sporulation (Spo0A) PubMed

• Regulatory mechanism:
  • Spo0A: transcription repression PubMed

• Additional information:
  • number of protein molecules per cell (minimal medium with glucose and ammonium): 437 PubMed
  • number of protein molecules per cell (complex medium with amino acids, without glucose): 837 PubMed

Biological materials

• Mutant:
  • YK204 (sepF::spc), available in the labs of Leendert Hamoen and Jörg Stülke

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

Labs working on this gene/protein

Leendert Hamoen, CBCB, Newcastle University, UK

Shu Ishikawa, Nara Institute of Science and Technology, Nara, Japan

Your additional remarks

SepF mutation is synthetic lethal in combination with an ezrA mutation or an ftsA mutation.