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SIAH1

siah E3 ubiquitin protein ligase 1

E3 ubiquitin-protein ligase that mediates ubiquitination and subsequent proteasomal degradation of target proteins. E3 ubiquitin ligases accept ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Mediates E3 ubiquitin ligase activity either through direct binding to substrates or by functioning as the essential RING domain subunit of larger E3 complexes. Triggers the ubiquitin-mediated degradation of many substrates, including proteins involved in transcription regulation (ELL2, MYB, POU2AF1, PML and RBBP8), a cell surface receptor (DCC), the cell-surface receptor-type tyrosine kinase FLT3, the cytoplasmic signal transduction molecules (KLF10/TIEG1 and NUMB), an antiapoptotic protein (BAG1), a microtubule motor protein (KIF22), a protein involved in synaptic vesicle function in neurons (SYP), a structural protein (CTNNB1) and SNCAIP. Confers constitutive instability to HIPK2 through proteasomal degradation. It is thereby involved in many cellular processes such as apoptosis, tumor suppression, cell cycle, axon guidance, transcription regulation, spermatogenesis and TNF-alpha signaling. Has some overlapping function with SIAH2. Induces apoptosis in cooperation with PEG3. Upon nitric oxid (NO) generation that follows apoptotic stimulation, interacts with S-nitrosylated GAPDH, mediating the translocation of GAPDH to the nucleus. GAPDH acts as a stabilizer of SIAH1, facilitating the degradation of nuclear proteins.

Gene Name: siah E3 ubiquitin protein ligase 1
Synonyms: SIAH1, HSIAH1, HUMSIAH, Siah-1, Siah-1a, Seven in absentia homolog 1, SIAH1A
Target Sequences: NM_003031 NP_003022.3 Q8IUQ4

Publications (2)

1
Inhibition of RAS-mediated transformation and tumorigenesis by targeting the downstream E3 ubiquitin ligase seven in absentia homologue. Schmidt RL, Park CH, Ahmed AU, Gundelach JH, Reed NR, Cheng S, Knudsen BE, Tang AH. Cancer research. 2007 67:11798-810. (ICC, IHC, WB, Flo) [PubMed:18089810]
2
BAG1 modulates huntingtin toxicity, aggregation, degradation, and subcellular distribution. Sroka K, Voigt A, Deeg S, Reed JC, Schulz JB, Bhr M, Kermer P. Journal of neurochemistry. 2009 111:801-7. [PubMed:19712056] Related Antibodies: LS-C34634.

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Proteins (9)
Over-Expression Lysate (4)
Recombinant (5)
SIAH1 (9)
No (9)
GST (1)
GST, N-terminus (2)
GST, N-terminus + His, C-terminus (1)
His (1)
Myc-DDK (Flag) (4)
Human (7)
293T Cells (2)
E. coli (3)
HEK 293 Cells (2)
Wheat Germ Extract (2)
Purified (2)
SIAH1 Protein - Western validation with an anti-DDK antibody * L: Control HEK293 lysate R: Over-expression lysate
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HEK 293 Cells
Myc-DDK (Flag)
34.4 kDa
100 µg/$494
SIAH1 Protein - 12.5% SDS-PAGE Stained with Coomassie Blue.
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Wheat Germ Extract
GST, N-terminus
10 µg/$479; 25 µg/$670
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E. coli
GST, N-terminus + His, C-terminus
58.9 kDa
50 µg/$419
SIAH1 Protein - 12.5% SDS-PAGE of human SIAH1 stained with Coomassie Blue
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Wheat Germ Extract
GST
56.76 kDa
10 µg/$479; 25 µg/$670
SIAH1 Protein - (Tris-Glycine gel) Discontinuous SDS-PAGE (reduced) with 5% enrichment gel and 15% separation gel.
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E. coli
GST, N-terminus
1 mg/$1,355; 100 µg/$420; 20 µg/$323
SIAH1 Protein - Western validation with an anti-DDK antibody * L: Control HEK293 lysate R: Over-expression lysate
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293T Cells
Myc-DDK (Flag)
34.4 kDa
20 µg/$150
SIAH1 Protein - Western validation with an anti-DDK antibody * L: Control HEK293 lysate R: Over-expression lysate
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293T Cells
Myc-DDK (Flag)
34.63 kDa
20 µg/$150
SIAH1 Protein - Western validation with an anti-DDK antibody * L: Control HEK293 lysate R: Over-expression lysate
Select
HEK 293 Cells
Myc-DDK (Flag)
34.63 kDa
100 µg/$494
SIAH1 Protein
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E. coli
His
50 µg/$411; 250 µg/$985; 10 µg/$276
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For RESEARCH USE ONLY. Intended for use by laboratory professionals. Not intended for human diagnostic or therapeutic purposes.

The data on this page has been compiled from LifeSpan internal sources, the National Center for Biotechnology Information (NCBI), and The Universal Protein Resource (UniProt).