Domain

Signal transduction histidine kinase, dimerisation/phosphoacceptor domain (IPR003661)

Short name: HisK_dim/P

Domain relationships

None.

Description

This entry represents the dimerisation and phosphoacceptor domain found in some histidine kinases. Signal transducing histidine kinases are the key elements in two-component signal transduction systems, which control complex processes such as the initiation of development in microorganisms [PMID: 8868347]. Examples of histidine kinases are EnvZ, which plays a central role in osmoregulation [PMID: 10426948]. Histidine kinases usually have an N-terminal ligand-binding domain and a C-terminal kinase domain, but other domains may also be present. The kinase domain is responsible for the autophosphorylation of the histidine with ATP, the phosphotransfer from the kinase to an aspartate of the response regulator, and the phosphotransfer from aspartyl phosphate back to ADP or to water [PMID: 11145881]. The homodimeric domain includes the site of histidine autophosphorylation and phosphate transfer reactions. The structure of the homodimeric domain comprises a closed, four-helical bundle with a left-handed twist, formed by two identical alpha-hairpin subunits.

GO terms

Biological Process

GO:0007165 signal transduction

Molecular Function

GO:0000155 phosphorelay sensor kinase activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
CDD
SMART
Pfam