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You are here:Home » Molecular Biology » Growth Factors-Oncostatin M » Oncostatin M, Recombinant, Human (OSM)

Oncostatin M, Recombinant, Human (OSM)

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Specifications

Oncostatin M (OSM) is a member of the interleukin-6 family of cytokines. Of these cytokines, OSM is closely related structually, genetically and functionally to leukemia inhibitory factor. However, OSM-specific biological activities have been reported in hematopoiesis and liver development.
Catalog #O6500-01A
DescriptionRecombinant Human OSM produced in E.Coli is a single, non-glycosylated polypeptide chain containing 227 amino acids and having a molecular mass of 26kD. Recombinant OSM is purified by proprietary chromatographic techniques.
Amino Acid SequenceThe sequence of the first five N-terminal amino acids was determined and was found to be Met-Ala-Ala-Ile-Gly
Dimers and AggregatesLess than 1% as determined by silver-stained SDS-PAGE gel analysis.
Biological ActivityHuman Oncostatin M is fully biologically active when compared to standard. The ED50 as determined by the dose-dependent stimulation of Human TF-1 cells is < 2 ng/ml, corresponding to a Specific Activity of 5 x 105 IU/mg.
Endotoxin 0.1ng/ug (IEU/ug) of recombinant OSM.
Protein ContentProtein quantitation was carried out by two independent methods:
1. UV spectroscopy at 280 nm using the absorbency value of 0.45 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. Analysis by RP-HPLC, using a standard solution of OSM as a Reference Standard.
SolubilityIt is recommended to reconstitute the lyophilized rHuOSM in sterile 18M -cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.
StabilityLyophilized Recombinant Human OSM although stable at room temperature for 3 weeks, should be stored desiccated below -180C. Upon reconstitution OSM should be stored at 40C between 2-7 days and for future use below -180C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Please avoid freeze-thaw cycles.
Molecular Weight26kD
SourceE. coli
Purity98% as determined by RP-HPLC, anion-exchange FPLC and/or reducing and non-reducing SDS-PAGE Silver Stained gel.
Concentration~1mg/ml
FormSupplied as a lyophilized powder without additives.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.


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