Human 14-3-3 Sigma (SFN) Protein
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Description
Human 14-3-3 sigma Protein is a recombinant protein from Human produced in E. coli. A DNA sequence encoding the human SFN (NP_006133.1) (Met 1-Ser 248) was fused with the GST tag at the N-terminus.
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Product specifications
| Category | Proteins and Peptides |
| Immunogen Target | 14-3-3 Sigma (SFN) |
| Host | E. coli |
| Origin | Human |
| Observed MW | Molecular Weight: 50.1 kDa Sequence Fragment: Met1-Ser248 Tag: N-terminal GST tag Validity: The validity for this protein is 12 months. |
| Expression | Recombinant |
| Purity | > 94% (SDS-PAGE) |
| Size 1 | 100 µg |
| Form | |
| Tested Applications | SDS-PAGE |
| Buffer | Lyophilized from sterile 20mM Tris, 150mM NaCl, 10mM GSH, 25% glycerol, pH 8.0. |
| Availability | Shipped within 5-15 working days. |
| Storage | Aliquot and store at -20°C or -80°C. Avoid repeated freeze/thaw cycles. |
| Dry Ice | No |
| NCBI Accession | NP_006133.1 |
| Alias | SFN, YWHAS, Stratifin,14-3-3σ protein |
| Background | Protein SFN |
| Status | RUO |
| Note | This product is for research use only. Not for human consumption, cosmetic, therapeutic or diagnostic use. |
Descripción
Stratifin (SFN) , also known as 14-3-3 sigma, is a member of the 14-3-3 protein family that acts as a critical regulator of cell cycle progression, DNA damage response, and cellular stress. It binds to phosphorylated serine/threonine residues on target proteins, facilitating their localization, stability, and activity. Stratifin is specifically involved in G2/M cell cycle checkpoint control by sequestering cyclin-dependent kinase complexes like CDC25C in the cytoplasm, preventing premature mitotic entry under DNA damage conditions. It is highly expressed in epithelial tissues and is essential for maintaining epithelial cell integrity, polarity, and stress responses. Stratifin acts as a tumor suppressor by inhibiting uncontrolled proliferation; its downregulation has been observed in breast, lung, and gastrointestinal cancers due to epigenetic silencing. Functional studies reveal its role in mediating stress-induced growth arrest and apoptosis, underscoring its importance in tumor suppression, DNA repair, and cell cycle regulation.
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14-3-3 proteins regulate many cellular processes relevant to cancer biology, notably apoptosis, mitogenic signaling and cell-cycle checkpoints. Seven isoforms, denoted 14-3-3 b, g, e, z, h, q and s, comprise this family of signaling intermediates. 14-3-3 s, also known as SFN, stratifin, HME1 or YWHAS, is a secreted adaptor protein that is involved in regulating both general and specific signaling pathways. Expressed predominately in stratified squamous keratinising epithelium, 14-3-3 s is able to bind and modify the activity of a large number of proteins, such as KRT17 (Keratin 17), through recognition of a phosphothreonine or phosphoserine motif. When bound to Keratin 17, for example, 14-3-3 s acts to stimulate the Akt/mTOR signaling pathway by upregulating protein synthesis and cell growth. 14-3-3 s also functions to positively mediate IGF-I-induced cell cycle progression and can bind to a variety of translation initiation factors, thus controlling mitotic translation. In response to tumor growth, 14-3-3 s positively regulates the tumor suppressor p53 and increases the rate of p53-regulated inhibition of G2/M cell cycle progression. Multiple isoforms of 14-3-3 s exist due to alternative splicing events.
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