product summary
company name :
Protein Laboratories Rehovot
product type :
protein
product name :
Human leptin
catalog :
LEP-5
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product information
Title :
Human leptin
Description :
Recombinant protein - human leptin, one polypeptide chain containing 146 amino and additional Ala at N-terminus acids and having a molecular mass of ~ 16 kDa., Human leptin was purified by proprietary chromatographic techniques, see Raver et al. Gen. Comp. Endocrinol. (2002).
Source :
Escherichia coli
Physical Appearance :
White lyophilized (freeze-dried) powder.
Formulation :
The recombinant protein was lyophilized from a concentrated (1mg/ml) solution with 0.0045mM NaHCO3.
Solubility :
It is recommended to reconstitute the lyophilized recombinant human leptin in sterile water or 0.4% NaHCO3 adjusted to pH 8-9, not less than 100µg/ml, which can then be further diluted to other aqueous solutions.
Stability :
Lyophilized recombinant human leptin although stable at room temperature for several weeks, should be stored desiccated below -18C. Upon reconstitution at > 0.1 human leptin mg/ml and up to 2 mg and filter sterilization recombinant human leptin can be stored at +4C or even room temperature for several weeks. At lower concentration addition of a carrier protein (0.1% HSA or BSA) is suggested. Please prevent freeze-thaw cycles.
Purity :
Purity of recombinant human leptin is greater than 95.0% as determined by: (a) Gel filtration analysis of the recombinant protein. (b) Analysis by reducing and non-reducing SDS-PAGE gel.
Amino Acid Sequence :
The sequence of the first five N-terminal amino acids of recombinant human leptin was determined and was found to be Ala-Val-Pro-Ile-Gln
Dimers and Aggregates :
The purified recombinant human leptin (16K) consists of > 93% monomers as determined by gel-filtration chromatography.
Biological Activity :
PLR’s recombinant human leptin is fully biologically active as evidenced by inducing proliferation of BAF/3 cells stably transfected with the long form of human leptin receptor.
Endotoxin :
The endotoxin content of recombinant human leptin is less than 0.1 ng/µg (IEU/µg).
Protein content :
Protein quantitation in recombinant human leptin was carried out by UV spectroscopy at 280 nm using the absorbency value of 0.87 as the extinction coefficient for a 0.1% (1mg/ml) solution at pH 8.0. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
Usage :
Recombinant human leptin is offered by PLR for laboratory research
more info or order :
company information
Protein Laboratories Rehovot
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