| Primary Identifier | IPR013787 | Type | Domain |
| Short Name | S100_Ca-bd_sub |
| description | The calcium-binding domain found in S100 and CaBP-9k proteins is a subfamily of the EF-hand calcium-binding domain []. S100s are small dimeric acidic calcium and zinc-binding proteins abundant in the brain, with S100B playing an important role in modulating the proliferation and differentiation of neurons and glia cells []. S100 proteins have two different types of calcium-binding sites: a low affinity one with a special structure, and a 'normal' EF-hand type high-affinity site.Calbindin-D9k (CaBP-9k) also belong to this family of proteins, but it does not form dimers. CaBP-9k is a cytosolic protein expressed in a variety of tissues. Although its precise function is unknown, it appears to be under the control of the steroid hormones oestrogen and progesterone in the female reproductive system []. In the intestine, CaBP-9k may be involved in calcium absorption by mediating intracellular diffusion [].This entry represents a subdomain of the calcium-binding domain found in S100, CaBP-9k, and related proteins. |
