Abstract:
:Epithelial Ca(2+)-regulation, which governs cornified envelope formation in the skin epidermis and hair follicles, closely coincides with the expression of S100A3, filaggrin and trichohyalin, and the post-translational modification of these proteins by Ca(2+)-dependent peptidylarginine deiminases. This review summarizes the current nomenclature and evolutional aspects of S100 Ca(2+)-binding proteins and S100 fused-type proteins (SFTPs) classified as a separate protein family with special reference to the molecular structure and function of S100A3 dominantly expressed in hair cuticular cells. Both S100 and SFTP family members are identified by two distinct types of Ca(2+)-binding loops in an N-terminal pseudo EF-hand motif followed by a canonical EF-hand motif. Seventeen members of the S100 protein family including S100A3 are clustered with seven related genes encoding SFTPs on human chromosome 1q21, implicating their association with epidermal maturation and diseases. Human S100A3 is characterized by two disulphide bridges and a preformed Zn(2+)-pocket, and may transfer Ca(2+) ions to peptidylarginine deiminases after its citrullination-mediated tetramerization. Phylogenetic analysis utilizing current genome databases suggests that divergence of the S100A3 gene coincided with the emergence of hair, a defining feature of mammals, and that the involvement of S100A3 in epithelial Ca(2+)-cycling occurred as a result of a skin adaptation in terrestrial mammals.
journal_name
Biochimiejournal_title
Biochimieauthors
Kizawa K,Takahara H,Unno M,Heizmann CWdoi
10.1016/j.biochi.2011.05.028subject
Has Abstractpub_date
2011-12-01 00:00:00pages
2038-47issue
12eissn
0300-9084issn
1638-6183pii
S0300-9084(11)00185-4journal_volume
93pub_type
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