CUBDomain first found in C1r, C1s, uEGF, and bone morphogenetic protein.
|SMART accession number:||SM00042|
|Description:||This domain is found mostly among developmentally-regulated proteins. Spermadhesins contain only this domain.|
|Interpro abstract (IPR000859):|
The CUB domain (for complement C1r/C1s, Uegf, Bmp1) is a structural motif of approximately 110 residues found almost exclusively in extracellular and plasma membrane-associated proteins, many of which are developmentally regulated [(PUBMED:8510165), (PUBMED:2026272)]. These proteins are involved in a diverse range of functions, including complement activation, developmental patterning, tissue repair, axon guidance and angiogenesis, cell signalling, fertilisation, haemostasis, inflammation, neurotransmission, receptor-mediated endocytosis, and tumour suppression [(PUBMED:17335815), (PUBMED:17051152)]. Many CUB-containing proteins are peptidases belonging to MEROPS peptidase families M12A (astacin) and S1A (chymotrypsin). Proteins containing a CUB domain include:
Several of the above proteins consist of a catalytic domain together with several CUB domains interspersed by calcium-binding EGF domains. Some CUB domains appear to be involved in oligomerisation and/or recognition of substrates and binding partners. For example, in the complement proteases, the CUB domains mediate dimerisation and binding to collagen-like regions of target proteins (e.g. C1q for C1r/C1s). The structure of CUB domains consists of a beta-sandwich with a jelly-roll fold. Almost all CUB domains contain four conserved cysteines that probably form two disulphide bridges (C1-C2, C3-C4). The CUB1 domains of C1s and Map19 have calcium-binding sites [(PUBMED:17446170)].
Click on the following links for more information.
- Evolution (species in which this domain is found)
- Literature (relevant references for this domain)
- Metabolism (metabolic pathways involving proteins which contain this domain)
- Structure (3D structures containing this domain)
- Links (links to other resources describing this domain)