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Recombinant Human TGF-beta 1 (Human Cell-expressed) Protein

  • Purity
    >95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
  • Endotoxin Level
    <0.01 EU per 1 μg of the protein by the LAL method.
  • Activity
    Measured by its ability to inhibit the IL-4-dependent proliferation of HT‑2 mouse T cells. Tsang, M. et al. (1995) Cytokine 7:389. The ED50 for this effect is typically 0.04-0.2 ng/mL.
  • Source
    Human embryonic kidney cell, HEK293-derived Ala279-Ser390
  • Accession #
  • N-terminal Sequence
    Analysis
    Ala279
  • Predicted Molecular Mass
    12.8 (monomer) kDa
  • SDS-PAGE
    11 kDa, reducing conditions
Carrier Free
What does CF mean?
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
What formulation is right for me?
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
7754-BH
 
7754-BH/CF
Formulation Lyophilized from a 0.2 μm filtered solution in Acetonitrile and TFA with BSA as a carrier protein.
Formulation Lyophilized from a 0.2 μm filtered solution in Acetonitrile and TFA.
Reconstitution Reconstitute at 100 μg/mL in sterile 4 mM HCl containing at least 0.1% human or bovine serum albumin.
Reconstitution Reconstitute at 100 μg/mL in sterile 4 mM HCl.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: TGF-beta 1
TGF‑ beta 1 (transforming growth factor beta 1) is one of three closely related mammalian members of the large TGF‑ beta superfamily that share a characteristic cystine knot structure (1‑7). TGF‑ beta 1, ‑2 and ‑3 are highly pleiotropic cytokines that are proposed to act as cellular switches that regulate processes such as immune function, proliferation and epithelial‑mesenchymal transition (1‑4). Each TGF‑ beta isoform has some non‑redundant functions; for TGF‑ beta 1, mice with targeted deletion show defects in hematopoiesis and endothelial differentiation, and die of overwhelming inflammation (2). Human TGF‑ beta 1 cDNA encodes a 390 amino acid (aa) precursor that contains a 29 aa signal peptide and a 361 aa proprotein (8). A furin-like convertase processes the proprotein to generate an N‑terminal 249 aa latency‑associated peptide (LAP) and a C‑terminal 112 aa mature TGF‑ beta 1 (8, 9). Disulfide-linked homodimers of LAP and TGF‑ beta 1 remain non‑covalently associated after secretion, forming the small latent TGF‑ beta 1 complex (8‑10). Covalent linkage of LAP to one of three latent TGF‑ beta binding proteins (LTBPs) creates a large latent complex that may interact with the extracellular matrix (9, 10). TGF‑ beta is activated from latency by pathways that include actions of the protease plasmin, matrix metalloproteases, thrombospondin 1 and a subset of integrins (10). Mature human TGF‑ beta 1 shares 100% aa identity with pig, dog and cow TGF‑ beta 1, and 99% aa identity with mouse, rat and horse TGF‑ beta 1. It demonstrates cross‑species activity (1). TGF‑ beta 1 signaling begins with high‑affinity binding to a type II ser/thr kinase receptor termed TGF‑ beta  RII. This receptor then phosphorylates and activates a second ser/thr kinase receptor, TGF‑ beta  RI (also called activin receptor‑like kinase (ALK) ‑5), or alternatively, ALK‑1. This complex phosphorylates and activates Smad proteins that regulate transcription (3, 11, 12). Contributions of the accessory receptors betaglycan (also known as TGF‑ beta  RIII) and endoglin, or use of Smad-independent signaling pathways, allow for disparate actions observed in response to TGF‑ beta in different contexts (11).
  • References:
    1. Derynck, R. and K. Miyazono (2008) Cold Spring Harbor Laboratory Press p. 29.
    2. Dunker, N. and K. Krieglstein (2000) Eur. J. Biochem. 267:6982.
    3. Wahl, S.M. (2006) Immunol. Rev. 213:213.
    4. Chang, H. et al. (2002) Endocr. Rev. 23:787.
    5. Lin, J.S. et al. (2006) Reproduction 132:179.
    6. Hinck, A.P. et al. (1996) Biochemistry 35:8517.
    7. Mittl, P.R.E. et al. (1996) Protein Sci. 5:1261.
    8. Derynck, R. et al. (1985) Nature 316:701.
    9. Miyazono, K. et al. (1988) J. Biol. Chem. 263:6407.
    10. Oklu, R. and R. Hesketh (2000) Biochem. J. 352:601.
    11. de Caestecker, M. et al. (2004) Cytokine Growth Factor Rev. 15:1.
    12. Zuniga, J.E. et al. (2005) J. Mol. Biol. 354:1052.
  • Long Name:
    Transforming Growth Factor beta 1
  • Entrez Gene IDs:
    7040 (Human); 21803 (Mouse); 59086 (Rat); 397078 (Porcine); 100033900 (Equine);
  • Alternate Names:
    TGFB1; CEDLAP; DPD1; latency-associated peptide; TGFB; TGFbeta; TGF-beta 1 protein; TGF-beta-1; transforming growth factor beta-1; transforming growth factor, beta 1
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  • Catalog #
    7754-BH
  • Formulations

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