Recombinant Human Lymphotoxin alpha2/beta1 Protein

Name: Recombinant Human Lymphotoxin alpha2/beta1 Protein
Brand: R&D Systems
SKU: 679-TX
Price: 474 USD
Availability: InStock

R&D Systems | Catalog # 679-TX

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Product Documents

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Product Specifications
Preparation & Storage
Calculators
Background
Product Documents
Specific Notices
Research Areas

Key Product Details

R&D Systems Sf 21 (baculovirus)-derived Recombinant Human Lymphotoxin alpha2/beta1 Protein (679-TX)
Quality control testing to verify active proteins with lot specific assays by in-house scientists
All R&D Systems proteins are covered with a 100% guarantee

Source

Sf 21 (baculovirus)

Accession Number

P01374 (LT alpha ) & Q06643 (LT beta )

Structure / Form

Noncovalently-linked heterotrimer

Applications

Bioactivity

View all Lymphotoxin Proteins and Enzymes »

Product Specifications

Source

Spodoptera frugiperda, Sf 21 (baculovirus)-derived human Lymphotoxin protein
Leu35-Leu205 (LT alpha ) & Leu54-Gly244 (LT beta ), both with an N-terminal Met & Thr41 ‑ Leu205 (LT alpha )

Purity

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.

Endotoxin Level

<1.0 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Met & Thr41 (LT alpha ) & Met (LT beta )

Predicted Molecular Mass

18 kDa (LT alpha ), 18.5 kDa ( LT beta )

SDS-PAGE

18-26 kDa, reducing conditions

Activity

Measured in a cytotoxicity assay using L‑929 mouse fibroblast cells.
The ED₅₀ for this effect is 0.5‑3 ng/mL.

Formulation, Preparation, and Storage

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.

Carrier: 679-TX

Formulation	Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.
Reconstitution	Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin.
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.

Carrier Free: 679-TX/CF

Formulation	Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution	Reconstitute at 100 μg/mL in sterile PBS.
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.

Calculators

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

Volume (to add to vial)

Mass (in vial)

Desired Reconstitution Concentration

Background: Lymphotoxin

Lymphotoxin-alpha (LT-alpha ), also known as tumor necrosis factor (TNF) beta, and lymphotoxin-beta (LT-beta ) are members of the TNF family. LT-alpha cDNA encodes a 205 amino acid secreted soluble protein with a 34 amino acid signal sequence. LT-beta cDNA encodes a 244 amino acid type II membrane protein with an N-terminal cytoplasmic domain (residues 1 - 18), a transmembrane region (residues 19 - 48), and an extracellular domain (residues 49 - 244). Secreted LT-alpha assembles as a soluble homotrimer, LT-alpha 3. In addition, secreted LT-alpha also complexes with the membrane associated LT-beta to generate two types of heterotrimers, LT-alpha 1/ beta 2 and LT-alpha 2/ beta 1 (1). The soluble LT-alpha 3 binds both TNF RI (p55) and TNF RII (p75). In contrast, the predominant membrane-bound heterotrimer, LT-alpha 1/ beta 2, binds only to the lymphotoxin beta receptor (LT beta R). LT-alpha 2/ beta 1 is capable of binding LT beta R, TNF RI (p55), and TNF RII (p75). LT plays a role in normal lymphoid organogenesis (2, 3). Transgenic LT-alpha knock-out mice exhibited a loss in lymph node development, a change in splenic architecture, and impaired germinal center formation (4). LT is expressed by activated naive CD4 cells, unpolarized IL-2-secreting effectors, and Th1 effectors. A loss of LT expression and lack of TNF-alpha or TNF-beta secretion is associated with prior exposure to IL-4 and a Th2 phenotype (5).