Anti-STIM1 Antibody Picoband®

Stromal interaction molecule 1 is a protein that in humans is encoded by the STIM1 gene. STIM1 has a single transmembranedomain, and is localized to the endoplasmic reticulum, and to a lesser extent to the plasma membrane. This gene encodes a type 1 transmembrane protein that mediates Ca2+ influx after depletion of intracellular Ca2+ stores by gating of store-operated Ca2+ influx channels (SOCs) . It is one of several genes located in the imprinted gene domain of 11p15.5, an important tumor-suppressor gene region. Alterations in this region have been associated with the Beckwith-Wiedemann syndrome, Wilms tumor, rhabdomyosarcoma, adrenocrotical carcinoma, and lung, ovarian, and breast cancer. This gene may play a role in malignancies and disease that involve this region, as well as early hematopoiesis, by mediating attachment to stromal cells. Mutations in this gene are associated with fatal classic Kaposi sarcoma, immunodeficiency due to defects in store-operated calcium entry (SOCE) in fibroblasts, ectodermal dysplasia and tubular aggregate myopathy. This gene is oriented in a head-to-tail configuration with the ribonucleotide reductase 1 gene (RRM1), with the 3' end of this gene situated 1.6 kb from the 5' end of the RRM1 gene. Alternative splicing of this gene results in multiple transcript variants.

Plays a role in mediating store-operated Ca (2+) entry (SOCE), a Ca (2+) influx following depletion of intracellular Ca (2+) stores. Acts as Ca (2+) sensor in the endoplasmic reticulum via its EF-hand domain. Upon Ca (2+) depletion, translocates from the endoplasmic reticulum to the plasma membrane where it activates the Ca (2+) release-activated Ca (2+) (CRAC) channel subunit, TMEM142A/ORAI1. Involved in enamel formation. .

1. Parker NJ, Begley CG, Smith PJ, Fox RM (Feb 1997) . Molecular cloning of a novel human gene (D11S4896E) at chromosomal region 11p15.5. Genomics 37 (2) : 253–6. 2. Soboloff, Jonathan; Rothberg, B. S.; Madesh, M.; Gill, D. L. (September 2012) .STIM proteins: dynamic calcium signal transducers. Nat Rev Mol Cell Biol 13 (9) : 549–65. 3. Williams RT, Manji SS, Parker NJ, Hancock MS, Van Stekelenburg L, Eid JP, Senior PV, Kazenwadel JS, Shandala T, Saint R, Smith PJ, Dziadek MA (Jul 2001) .Identification and characterization of the STIM (stromal interaction molecule) gene family: coding for a novel class of transmembrane proteins. Biochem J 357 (Pt 3) : 673–85.

Store at -20°C for one year from date of receipt. After reconstitution, at 4°C for one month. It can also be aliquotted and stored frozen at -20°C for six months. Avoid repeated freeze-thaw cycles.

Cell membrane; Single-pass type I membrane protein. Endoplasmic reticulum membrane; Single-pass type I membrane protein. Cytoplasm, cytoskeleton. Translocates from the endoplasmic reticulum to the cell membrane in response to a depletion of intracellular calcium and is detected at punctae corresponding to junctions between the endoplasmic reticulum and the cell membrane. Associated with the microtubule network at the growing distal tip of microtubules.