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ActoFactor™ Recombinant Human Leukemia inhibitory factor (E. coli)
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Cat.No.
CSC-CTK0107
Description
Leukemia Inhibitory Factor also called LIF is a lymphoid factor that promotes long-term maintenance of embryonic stem cells by suppressing spontaneous differentiation. Leukemia Inhibitory Factor has several functions such as cholinergic neuron differentiation, control of stem cell pluripotency, bone & fat metabolism, mitogenesis of factor dependent cell lines & promotion of megakaryocyte production in vivo. Human and mouse LIF exhibit a 78% identity in its amino acid sequence. Human LIF is as active on human cells as is it is on mouse cells, though mouse LIF is about 1000 fold less active on human cells, than human LIF. Human recombinant Leukemia Inhibitory Factor (LIF) produced in E. coli is a single, non- glycosylated, polypeptide chain containing 180 amino acids and having a molecular mass of 19,717 Dalton.
Species
Human
Product Overview
Human LIF expressed in E.coli
Molecular Mass
19.7 kDa
Size
CAT# CSC-CTK0107-10 (10 μg); CAT# CSC-CTK0107-50 (50 μg)
Expression System
E.coli
Purity
Greater than 98% as determined by SDS-PAGE and RP-HPLC analysis.
Activity
The ED50, determined by the M1 cell differentiation assay is, <0.01 ng/ml, corresponding to a specific activity of Greater than 1 x 10^8 IU/mg.
Endotoxin Level
N/A
Formulation
Sterile-filtered, white, lyophilized (freeze-dried)powder. The protein was lyophilized from a sterile-filtered concentrated (1 mg/ml) protein solution in 1X PBS (pH 7.4).
Reconstitution
Please centrifuge product briefly before opening vial. The lyophilized protein should be reconstituted in sterile, ultrapure water or aqueous buffers to a concentration of 0.1 - 1.0 mg mg/ml. This solution can then be diluted into other aqueous buffers and stored at -20°C for future use.
Storage & Stability
The lyophilized protein, though stable at room temperature for up to 3 weeks, is best stored desiccated at -20°C. Reconstituted protein should be used immediately or stored long-term in undiluted working aliquots at -20°C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Avoid repeated freeze-thaw cycles.
Citation Guidance
If you use this products in your scientific publication, it should be cited in the publication as: Creative Bioarray cat no. If your paper has been published, please click here to submit the PubMed ID of your paper to get a coupon.
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