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|Lectin C-type domain|
Pentameric structure of rattlesnake venom lectin which is a galactose binding lectin.
A C-type lectin (CLEC) is a type of carbohydrate-binding protein domain known as a lectin. The C-type designation is from their requirement for calcium for binding. Proteins that contain C-type lectin domains have a diverse range of functions including cell-cell adhesion, immune response to pathogens and apoptosis.
Drickamer et al. classified C-type lectins into 7 subgroups (I to VII) based on the order of the various protein domains in each protein. This classification was subsequently updated in 2002, leading to seven additional groups (VIII to XIV). Most recently, three further subgroups were added (XV to XVII).
|I||Lecticans||EGF, Sushi, Ig and Link domains|
|II||Asialoglycoprotein and DC receptors||None|
|IV||Selectins||Sushi and EGF domains|
|V||NK - cell receptors||None|
|VI||Multi-CTLD endocytic receptors||FnII and Ricin domains|
|X||Polycystin||WSC, REJ, PKD domains|
|XI||Attractin (ATRN)||PSI, EGF and CUB domains|
|XII||Eosinophil major basic protein (EMBP)||None|
|XIV||Thrombomodulin, CD93, CD248||EGF domains|
|XVI||SEEC||SCP and EGF domains|
|XVII||CBCP/Frem1/QBRICK||CSPG repeats and CalX-beta domains|
The "NK Cell lectin-like receptors" are a very closely related group:
Additional proteins containing this domain include: