TapA

• Description: required for the anchoring of the TasA amyloid fibers to the cell and for the initiation of fiber polymerization, minor fiber component

Gene name	tapA
Synonyms	yqhD, yqxM
Essential	no
Product	TasA anchoring/assembly protein
Function	biofilm formation
Gene expression levels in SubtiExpress: tapA
Interactions involving this protein in SubtInteract: TapA
Regulation of this protein in SubtiPathways: tapA
MW, pI	28 kDa, 6.677
Gene length, protein length	759 bp, 253 aa
Immediate neighbours	sipW, yqzG
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

biofilm formation, membrane proteins

This gene is a member of the following regulons

AbrB regulon, RemA regulon, SinR regulon

The gene

Basic information

• Locus tag: BSU24640

Phenotypes of a mutant

The mutants are able to form a biofilm in the presence of D-amino acids PubMed

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:

• Protein family:

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity: D-amino acids lead to disappearance of TapA from the cell wall PubMed

• Interactions:
  • TapA-TasA PubMed
  • SipW-TapA PubMed

• Localization:
  • attached to the cell surface (on the outside of the cell), associated with peptidoglycan PubMed
  • secretion requires SipW PubMed

Database entries

• Structure:

• UniProt: P40949

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: tapA-sipW-tasA PubMed

• Expression browser: tapA PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • repressed by SinR PubMed
  • repressed during logrithmic growth (AbrB) PubMed

• Regulatory mechanism:
  • AbrB: transcription repression PubMed
  • SinR: transcription repression PubMed
  • RemA: transcription activation PubMed
  • LutR: transcription activation PubMed

• Additional information:
  • induction by sequestration of SinR by SinI or SlrA PubMed or by SlrR PubMed
  • the tapA-sipW-tasA operon is not expressed in a ymdB mutant PubMed
  • the amount of the mRNA is substantially decreased upon depletion of RNase Y (this is likely due to the increased stability of the sinR mRNA) PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion: pGP1926 (in pAC6), available in Stülke lab

• GFP fusion:

• YFP fusion: GP1537 lacA::p(tapA-yfp ermC), available in Stülke lab

• two-hybrid system:

• Antibody: