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leptin antagonist Active Protein

Rat leptin antagonist (mutant L39A/D40A/F41A)

Purity
The purity of recombinant rat leptin antagonist is greater than 98.0% as determined by:
(a) Gel filtration analysis.
(b) Analysis by reducing and non-reducing SDS-PAGE gel.
Synonyms
leptin antagonist; Rat leptin antagonist (mutant L39A/D40A/F41A); leptin antagonist active protein
Ordering
For Research Use Only!
Host
Escherichia Coli
Purity/Purification
The purity of recombinant rat leptin antagonist is greater than 98.0% as determined by:
(a) Gel filtration analysis.
(b) Analysis by reducing and non-reducing SDS-PAGE gel.
Form/Format
White lyophilized (freeze-dried) powder.
Concentration
0.85mg/ml (varies by lot)
Sequence
The sequence of the first five N-terminal amino acids of recombinant rat leptin antagonist was determined and was found to be Ala-Val-Pro-Ile-Gln
Sequence Length
167
Solubility
It is recommended to reconstitute the lyophilized recombinant rat leptin antagonist in sterile water or sterile 0.4% NaHCO3 adjusted to pH 8-9, not less than 100ug/ml, which can then be further diluted with other aqueous solutions.
Protein Content
Protein quantitation of recombinant rat leptin antagonist was carried out by UV spectroscopy at 280 nm using the absorbency value of 0.201 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).
Dimers and Aggregates
The purified recombinant rat leptin antagonist (16K) consists of > 97% monomers as determined by gel-filtration chromatography.
Endotoxin
Less than 0.1 ng/ug (IEU/ug) of recombinant rat leptin antagonist.
Formulation
Recombinant rat leptin was lyophilized from a concentrated (0.85mg/ml) solution with 0.003mM NaHCO3.
Biological Activity
recombinant rat leptin antagonist is capable of inhibiting leptin-induced proliferation of BAF/3 cells stably transfected with the long form of human leptin receptor. It also inhibits various leptin effects in several in vitro bioassays.
Preparation and Storage
Lyophilized recombinant rat leptin antagonist although stable at room temperature for several weeks, should be stored desiccated below -18 degree C. Upon reconstitution of recombinant rat leptin antagonist at > 0.1 rLEP mutant mg/ml and up to 2 mg/ml and filter sterilization recombinant rat leptin antagonist can be stored at 4 degree C or even room temperature for several weeks making it suitable for long term infusion studies using osmotic pumps. At lower concentration of recombinant rat leptin antagonist addition of a carrier protein (0.1% HSA or BSA) is suggested. Please prevent freeze-thaw cycles.
Related Product Information for leptin antagonist active protein
Recombinant rat leptin, one polypeptide chain containing 146 amino and additional Ala at N-terminus acids and having a molecular mass of ~ 16 kDa. Recombinant rat leptin was mutated, resulting in L39A/D40A/F41A mutant that was purified by proprietary chromatographic techniques, according to Salomon et al (2006) Protein Expression and PuriWcation 47, 128 -136.
Product Categories/Family for leptin antagonist active protein

NCBI and Uniprot Product Information

NCBI GI #
NCBI GeneID
NCBI Accession #
NCBI GenBank Nucleotide #
NCBI Official Full Name
leptin

NCBI Description

This gene encodes a protein that is secreted by white adipocytes, and which plays a major role in the regulation of body weight. This protein, which acts through the leptin receptor, functions as part of a signaling pathway that can inhibit food intake and/or regulate energy expenditure to maintain constancy of the adipose mass. This protein also has several endocrine functions, and is involved in the regulation of immune and inflammatory responses, hematopoiesis, angiogenesis and wound healing. Mutations in this gene and/or its regulatory regions cause severe obesity, and morbid obesity with hypogonadism. This gene has also been linked to type 2 diabetes mellitus development. [provided by RefSeq, Jul 2008]

Uniprot Description

leptin: May function as part of a signaling pathway that acts to regulate the size of the body fat depot. An increase in the level of LEP may act directly or indirectly on the CNS to inhibit food intake and/or regulate energy expenditure as part of a homeostatic mechanism to maintain constancy of the adipose mass. Defects in LEP may be a cause of obesity (OBESITY). It is a condition characterized by an increase of body weight beyond the limitation of skeletal and physical requirements, as the result of excessive accumulation of body fat. Belongs to the leptin family.

Protein type: Secreted; Cell development/differentiation; Hormone; Secreted, signal peptide

Chromosomal Location of Human Ortholog: 7q31.3

Cellular Component: extracellular space; cytoplasm; extracellular region

Molecular Function: peptide hormone receptor binding; growth factor activity; hormone activity

Biological Process: circadian rhythm; response to dietary excess; positive regulation of myeloid cell differentiation; regulation of fat cell differentiation; regulation of steroid biosynthetic process; negative regulation of transcription from RNA polymerase II promoter; female pregnancy; glucose homeostasis; positive regulation of luteinizing hormone secretion; negative regulation of appetite; positive regulation of tyrosine phosphorylation of Stat3 protein; response to insulin stimulus; response to vitamin E; regulation of cholesterol absorption; positive regulation of MAPKKK cascade; regulation of blood pressure; positive regulation of cell proliferation; positive regulation of ion transport; central nervous system neuron development; placenta development; positive regulation of cytokine production; cholesterol metabolic process; positive regulation of developmental growth; bile acid metabolic process; eating behavior; glucose metabolic process; adult feeding behavior; ovulation from ovarian follicle; leptin-mediated signaling pathway; negative regulation of vasoconstriction; tyrosine phosphorylation of STAT protein; fatty acid beta-oxidation; glycerol biosynthetic process; insulin secretion; response to hypoxia; energy reserve metabolic process; hormone metabolic process; regulation of gluconeogenesis; positive regulation of insulin receptor signaling pathway; positive regulation of follicle-stimulating hormone secretion; leukocyte tethering or rolling; regulation of insulin secretion; negative regulation of apoptosis

Disease: Leptin Deficiency

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Product Notes

The leptin antagonist (Catalog #AAA400037) is an Active Protein produced from Escherichia Coli and is intended for research purposes only. The product is available for immediate purchase. The amino acid sequence is listed below: The sequence of the first five N-terminal amino acids of recombinan t rat leptin antagonist was determined and was found to be Ala-Val-Pr o-Ile-Gln. It is sometimes possible for the material contained within the vial of "leptin antagonist, Active Protein" to become dispersed throughout the inside of the vial, particularly around the seal of said vial, during shipment and storage. We always suggest centrifuging these vials to consolidate all of the liquid away from the lid and to the bottom of the vial prior to opening. Please be advised that certain products may require dry ice for shipping and that, if this is the case, an additional dry ice fee may also be required.

Precautions

All products in the AAA Biotech catalog are strictly for research-use only, and are absolutely not suitable for use in any sort of medical, therapeutic, prophylactic, in-vivo, or diagnostic capacity. By purchasing a product from AAA Biotech, you are explicitly certifying that said products will be properly tested and used in line with industry standard. AAA Biotech and its authorized distribution partners reserve the right to refuse to fulfill any order if we have any indication that a purchaser may be intending to use a product outside of our accepted criteria.

Disclaimer

Though we do strive to guarantee the information represented in this datasheet, AAA Biotech cannot be held responsible for any oversights or imprecisions. AAA Biotech reserves the right to adjust any aspect of this datasheet at any time and without notice. It is the responsibility of the customer to inform AAA Biotech of any product performance issues observed or experienced within 30 days of receipt of said product. To see additional details on this or any of our other policies, please see our Terms & Conditions page.

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