• Purity

  >97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

• Endotoxin Level

  <0.10 EU per 1 μg of the protein by the LAL method.  

• Activity

  Measured in a cell proliferation assay using BaF3 mouse pro‑B cells transfected with human Leptin R. The ED    ₅₀ for this effect is 0.05-0.3 ng/mL.

• Source

  E. coli-derived Val22-Cys167, with an N-terminal Met

• Accession #

• N-terminal Sequence    
  Analysis

  Met

• Predicted Molecular Mass

  16.2 kDa

Background: Leptin/OB

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.

• References:

1. Considine, R. and Caro, J. (1996) Clinical Chemistry 42:843.

2. Tartaglia, L.A. et al., (1995) Cell 83:1263.

3. Cioffi, J.A. et al. (1996) Nature Medicine 2:585.

• Entrez Gene IDs:

  3952 (Human); 16846 (Mouse); 25608 (Rat)

• Alternate Names:

  FLJ94114; LEP; leptin (murine obesity homolog); leptin (obesity homolog, mouse); Leptin; OB; Obese protein; obese, mouse, homolog of; Obesity factor; OBOBS