PRLR Human, Antagonist

Mammotropin, Luteotropic hormone, Luteotropin, PRL.

Prolactin Human Receptor Antagonist del 1-9, G129R mutant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 190 amino acids + an additional Ala at n-terminal and having a molecular mass of ~ 22 kDa. The Human Prolactin ReceptorAntagonist is purified by proprietary chromatographic techniques.

Escherichia coli.

Sterile Filtered White lyophilized (freeze-dried) powder.

The protein was lyophilized from a concentrated (1-2mg/ml) solution with 0.02% -0.03% NaHCO3.

It is recommended to reconstitute the lyophilized PRLR in sterile 0.4% NaHCO3 adjusted to pH 8-9 not less than 100µg/ml, which can then be further diluted to other aqueous solutions.

Lyophilized PRLR although stable at room temperature for 3 weeks, should be stored desiccated below -18°C. Upon reconstitution at > 0.1 mg/ml and up to 3 mg/ml and filter sterilization PRLR can be stored at 4C for several weeks. Please prevent freeze-thaw cycles.

Greater than 97.0% as determined by:

(a) Analysis by Gel Filtration.

(b) Analysis by SDS-PAGE.

The sequence of the first six N-terminal amino acids was determined and was found to be Ala-Arg-Ser-Gln-Val-Thr

fully biologically active as evidenced by inhibiting PRLR-induced proliferation of Nb2 cells or Baf3 cells stably transfected with hPRL receptors. It also interacts at 1:1 molar ratio with human prolactin receptor extracellular domain as documented by SEC and SPR (Biacore analysis). It is ~ 100 fold more potent than 1-9 G129R hPRL in Ba/F3 cells and > 1000-fold potent in Nb2 cells.

SDS

Prolactin is a pituitary hormone which takes part in the stimulation of milk production, salt and water regulation, development, growth and reproduction. The primary step in its action is binding a specific membrane receptor (prolactin receptor) which belongs to the superfamily of class 1 cytokine receptors. PRLR varies in size (short and long forms) with tissue source and species, from ~40 kDa to 100 kDa. The PRL-R consists of at least 3 separate domains: an extracellular region with 5 cysteines which contains the prolactin binding site, a single transmembrane domain and a cytoplasmic region, the length of which appears to influence ligand binding and regulate cellular function.