(Siah E3 ubiquitin protein ligase 1, Seven in absentia homolog 1, seven in absentia homolog 1 (Drosophila), E3 ubiquitin-protein ligase SIAH1, HUMSIAH, hSIAH1, Siah-1a, SIAH1A, EC 6.3.2.)
E3 ubiquitin-protein ligase SIAH1 (SIAH1) belongs to the SIAH (seven in absentia homolog) family. SIAH1 is a tumor suppressor protein, which is expressed in intestinal epithelium and activated during apoptosis. SIAH1 is involved in ubiquitination and proteasome-mediated degradation of specific proteins. SIAH1 is comprised of an N-terminal RING-finger domain (required for proteolysis) and a cystein-rich C-terminal domain (which regulates oligomerization and SIAH binding to target proteins). SIAH1 causes indirect degradation of beta-catenin by way of creation of a complex with Siah-interacting protein (SIP), Skp1 and Ebi.
SIAH1 Human Recombinant produced in E. coli is a single polypeptide chain containing 216 amino acids (90-282) and having a molecular mass of 24.1 kDa. SIAH1 is fused to a 23 amino acid His-tag at N-terminus & purified by proprietary chromatographic techniques.
Purity: Greater than 95% as determined by SDS-PAGE.
Source: E.coli.
Physical Appearance: Sterile Filtered colorless solution.
Formulation: The SIAH1 solution (0.25mg/1ml) contains 20mM Tris-HCl buffer (pH 8.0), 100mM NaCl, 1mM DTT and 40% glycerol.
Amino acid sequence:
MGSSHHHHHH SSGLVPRGSH MGSVANSVLF PCKYASSGCE ITLPHTEKAD HEELCEFRPY SCPCPGASCK WQGSLDAVMP HLMHQHKSIT TLQGEDIVFL ATDINLPGAV DWVMMQSCFG FHFMLVLEKQ EKYDGHQQFF AIVQLIGTRK QAENFAYRLE LNGHRRRLTW EATPRSIHEG IATAIMNSDC LVFDTSIAQL FAENGNLGIN VTISMC.
Storage:
Store at 4°C if entire vial will be used within 2-4 weeks. Store, frozen at -20°C for longer periods of time. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Avoid multiple freeze-thaw cycles.
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