The annexins are a family of calcium-dependent phospholipid-binding proteins. ANXA9 cDNA encodes a 338aa protein with <40% identity to other annexins. Members of the annexin family contain 4 internal repeat domains, each of which includes a type II calcium-binding site. The calcium-binding sites are required for annexins to aggregate and cooperatively bind anionic phospholipids and extracellular matrix proteins. The most striking feature of annexin 31 is a complete ablation of all four homologous type II calcium-binding sites in the conserved tetrad core. Although all 4 type II calcium-binding sites in annexin 31 contained aa substitutions that ablated their function, structural analysis suggests that the conserved putative ion channel formed by the tetrad core is intact. ANXA9 may act as a low affinity receptor for acetylcholine and is expressed in the stratified squamous skin epithelium, but not in epithelia of other types (at protein level). ANXA9 is one of the target molecules recognized by autoantibodies in patients with pemphigus vulgaris, a rare, autoimmune skin disease in which epidermal blisters occur as the result of the loss of cell-cell adhesion. Applications: Suitable for use in Immunofluorescence and Western Blot. Other applications not tested. Recommended Dilution: Immunofluorescence: 10ug/ml Optimal dilutions to be determined by the researcher. AA Sequence: MAPSLTQEILSHLGLASKTAAWGTLGTLRTFLNFSVDKDAQRLLRAITGQGVDRSAIVDVLTNRSREQRQLISRNFQERTQQDLMKSLQAALSGNLERIVMALLQPTAQFDAQELRTALKASDSAVDVAIEILATRTPPQLQECLAVYKHNFQVEAVDDITSETSGILQDLLLALAKGGRDSYSGIIDYNLAEQDVQALQRAEGPSREETWVPVFTQRNPEHLIRVFDQYQRSTGQELEEAVQNRFHGDAQVALLGLASVIKNTPLYFADKLHQALQETEPNYQVLIRILISRCETDLLSIRAEFRKKFGKSLYSSLQDAVKGDCQSALLALCRAEDM Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
