Summary: SpoIIIAH-like protein
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Stage III sporulation protein AH (SpoIIIAH) is a protein that is involved in forespore engulfment. It forms a channel with SpoIIIAH that is open on the forespore end and closed (or gated) on the mother cell end. This allows sigma-E-directed gene expression in the mother-cell compartment of the sporangium to trigger the activation of sigma-G forespore-specific gene expression by a pathway of intercellular signaling. This family of proteins is found in bacteria, archaea and eukaryotes and so must have a wider function that in sporulation. Proteins in this family are typically between 174 and 223 amino acids in length.
Camp AH, Losick R;, Mol Microbiol. 2008;69:402-417.: A novel pathway of intercellular signalling in Bacillus subtilis involves a protein with similarity to a component of type III secretion channels. PUBMED:18485064 EPMC:18485064
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR024232
Stage III sporulation protein AH (SpoIIIAH) is a protein that is involved in forespore engulfment. It forms a channel with SpoIIIAH that is open on the forespore end and closed (or gated) on the mother cell end. This allows sigma-E-directed gene expression in the mother-cell compartment of the sporangium to trigger the activation of sigma-G forespore-specific gene expression by a pathway of intercellular signaling. This family of proteins is found in bacteria, archaea and eukaryotes and so must have a wider function than in sporulation. Proteins in this family are typically between 174 and 223 amino acids in length.
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Curation and family details
|Number in seed:||84|
|Number in full:||427|
|Average length of the domain:||186.60 aa|
|Average identity of full alignment:||23 %|
|Average coverage of the sequence by the domain:||93.45 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||2|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the SpoIIIAH domain has been found. There are 3 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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