Reactivity | RtSpecies Glossary |
Applications | Bioactivity |
Format | Carrier-Free |
Details of Functionality | Measured in a cell proliferation assay using BaF3 mouse pro‑B cells transfected with human Leptin R. The ED50 for this effect is 0.05-0.3 ng/mL. |
Source | E. coli-derived rat Leptin/OB protein Val22-Cys167, with an N-terminal Met |
Accession # | |
N-terminal Sequence | Met |
Protein/Peptide Type | Recombinant Proteins |
Gene | Lep |
Purity | >97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
Endotoxin Note | <0.10 EU per 1 μg of the protein by the LAL method. |
Dilutions |
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Theoretical MW | 16.2 kDa. Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors. |
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Publications |
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Storage | Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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Buffer | Lyophilized from a 0.2 μm filtered solution in PBS. |
Purity | >97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
Reconstitution Instructions | Reconstitute at 1 mg/mL in sterile 20 mM Tris-HCI, pH 8.0. |
Leptin is a identified protein product of the mouse obese gene. Mice with mutations in the obese gene that block the synthesis of Leptin have been found to be obese and diabetic and to have reduced activity, metabolism, and body temperature. cDNA clones encoding Leptin have been isolated from human, simian, mouse, and rat cells. Rat Leptin shares approximately 96% and 82% sequence identity with the mouse and human protein, respectively. Rat Leptin cDNA encodes a 167 amino acid residue protein with a 21 amino acid residue signal sequence that is cleaved to yield the 146 amino acid residue mature protein. The expression of Leptin mRNA has been shown to be restricted to adipose tissue.
A high-affinity receptor for Leptin (OB-R) with homology to gp130 and the G-CSF receptor has been cloned. OB-R mRNA has been shown to be expressed in the choroid plexus and in the hypothalamus. OB-R has also been identified as an isoform of B219, a sequence that is expressed in at least four isoforms in very primitive hematopoietic cell populations and in a variety of lymphohematopoietic cell lines (1 - 3). The possible roles of Leptin in body weight regulation, hematopoiesis and reproduction are being investigated.
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