Summary
Aspartate chemoreceptor, signal-transduction ligand-binding
This superfamily is characterised by a four-helix bundle structure that forms a ubiquitous sensory module in prokaryotic signal-transduction. The 4HB_MCP is always found between two predicted transmembrane helices indicating that it detects only extracellular signals. In many cases the domain is associated with a cytoplasmic HAMP domain suggesting that most proteins carrying the bundle might share the mechanism of transmembrane signalling which is well-characterised in E coli chemoreceptors.
This clan contains 4 families and the total number of domains in the clan is 16358. The clan was built by L Ulrich and P Coggill.
Literature references
- Ulrich LE, Zhulin IB;, Bioinformatics. 2005;21:iii45-iii48.: Four-helix bundle: a ubiquitous sensory module in prokaryotic signal transduction. PUBMED:16306392 EPMC:16306392
Members
This clan contains the following 4 member families:
4HB_MCP_1 CHASE3 HBM TarHExternal database links
SCOP: | 47170 |
Domain organisation
Below is a listing of the unique domain organisations or architectures from this clan. More...
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Alignments
The table below shows the number of occurrences of each domain throughout the sequence database. More...
Pfam family | Num. domains | Alignment |
---|---|---|
4HB_MCP_1 (PF12729) | 10055 (61.5%) | View |
CHASE3 (PF05227) | 4362 (26.7%) | View |
TarH (PF02203) | 1680 (10.3%) | View |
HBM (PF16591) | 261 (1.6%) | View |
Total: 4 | Total: 16358 | Clan alignment |
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Family relationships
This diagram shows the relationships between members of this clan. More...
Species distribution
Tree controls
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Structures
For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the MSD group, to allow us to map Pfam domains onto UniProt three-dimensional structures. The table below shows the mapping between the Pfam families in this clan, the corresponding UniProt entries, and the region of the three-dimensional structures that are available for that sequence.
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