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12  structures 2572  species 0  interactions 4099  sequences 16  architectures

Family: YbjN (PF10722)

Summary: Putative bacterial sensory transduction regulator

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Putative bacterial sensory transduction regulator Provide feedback

YbjN is a putative sensory transduction regulator protein found in Proteobacteria. As it is a multi-copy suppressor of the coenzyme A-associated temperature sensitivity in temperature-sensitive mutant strains of Escherichia coli the suggestion is that it both helps CoA-A1 and possibly works as a general stabiliser for some other unstable proteins [1]. This family was expanded to subsume other related families: DUF1790, DUF1821 and DUF2596.

Literature references

  1. Chen X, Shen D, Zhou B; , Biochem Biophys Res Commun. 2006;345:834-842.: Analysis of the temperature-sensitive mutation of Escherichia coli pantothenate kinase reveals YbjN as a possible protein stabilizer. PUBMED:16701556 EPMC:16701556

Internal database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR019660

YbjN is a putative sensory transduction regulator protein found in Proteobacteria. As it is a multi-copy suppressor of the coenzyme A-associated temperature sensitivity in temperature-sensitive mutant strains of Escherichia coli the suggestion is that it both helps CoA-A1 and possibly works as a general stabiliser for some other unstable proteins [ PUBMED:16701556 ].

Domain organisation

Below is a listing of the unique domain organisations or architectures in which this domain is found. More...

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Pfam Clan

This family is a member of clan TypeIII_Chap (CL0097), which has the following description:

The translocation of pathogenic proteins into a host cell is mediated by the type III secretory system. A component of this system is a chaperone, which binds to the protein which is going to be secreted in the bacterial cytosol and is involved in translocation of the secreted protein, although the chaperone is not translocated itself. An individual chaperone associates with one or two specific proteins [1]. There are a large number of type III secretory system chaperones, which are small acidic proteins and exhibit significant sequence divergence. This clan groups type III secretory system chaperones. Members with a known structure form small compact globular domains with an alpha-beta(3)- alpha-beta(2)-alpha like organisation [1].

The clan contains the following 6 members:

Autophagy_act_C CesT Chaperone_III DUF2299 Invas_SpaK YbjN


We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets and the UniProtKB sequence database. More...

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We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.

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Representative proteomes UniProt

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We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.

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You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

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HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...


This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.

Note: You can also download the data file for the tree.

Curation and family details

This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.

Curation View help on the curation process

Seed source: PRODOM_PD093695
Previous IDs: none
Type: Domain
Sequence Ontology: SO:0000417
Author: Mistry J , Coggill P , Bateman A
Number in seed: 101
Number in full: 4099
Average length of the domain: 126.90 aa
Average identity of full alignment: 17 %
Average coverage of the sequence by the domain: 71.60 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 57096847 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 22.0 22.0
Trusted cut-off 22.0 22.0
Noise cut-off 21.9 21.9
Model length: 127
Family (HMM) version: 11
Download: download the raw HMM for this family

Species distribution

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Colour assignments

Archea Archea Eukaryota Eukaryota
Bacteria Bacteria Other sequences Other sequences
Viruses Viruses Unclassified Unclassified
Viroids Viroids Unclassified sequence Unclassified sequence


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This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the adjacent tab. More...

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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 YbjN domain has been found. There are 12 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 sequence.

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AlphaFold Structure Predictions

The list of proteins below match this family and have AlphaFold predicted structures. Click on the protein accession to view the predicted structure.

Protein Predicted structure External Information
P0AAY6 View 3D Structure Click here
P9WKU9 View 3D Structure Click here