Anti-LEFTY A LEFTY2 Monoclonal Antibody

During vertebrate embryogenesis, a left-right axis is established. Secreted growth factors of the TGF-beta family, including gene products derived from nodal, lefty-1 and lefty-2, play crucial roles in establishing left-right asymmetries. TGF-beta (Transforming growth factor-beta) is a pleiotropic cytokine that regulates growth and differentiation of diverse types of cells. TGF-beta actions are directed by ligand-induced activation of TGF-beta receptors. Complexes formed move into the nucleus, where they act as components of a transcriptional complex. Lefty, a novel member of the TGF-beta superfamily, inhibits TGF-beta signaling. Lefty acts to inhibit phosphorylation of Smad2 following activation of the TGF-beta receptor. Lefty also inhibits events downstream from R-Smad phosphorylation. Lefty provides a repressed state of TGF-beta-responsive genes. The Lefty family is comprised of Lefty 1 and Lefty 2 in mouse, and Lefty A and Lefty B in humans. Members of the TGF-beta superfamily require processing for their activation. Cleavage is therefore an essential step for Lefty activation. Lefty is synthesized as a large inactive precursor (42 Kda) that must be endoproteolytically processed to release the bioactive polypeptide (28 kDa and 34 kDa forms) . The 28kDa form induces MAPK activity.

LeftyA, protein lefty 2, Left-right determination factor 2, Protein lefty-2, Left-right determination factor A, Protein lefty-A, Transforming growth factor beta-4, TGF-beta-4, Endometrial bleeding-associated factor

This protein A purified mouse monoclonal antibody reacts with a 30 kDa protein corresponding to human LEFTY. No reactivity occurs against 6X HIS tag. Significant sequence homology exists between the human and mouse forms of LEFTY. Cross-reactivity is expected with mouse and rat forms of the protein. Reactivity with other sources has not been determined.

Store vial at -20°C prior to opening. Aliquot contents and freeze at -20°C or below for extended storage. Avoid cycles of freezing and thawing. Centrifuge product if not completely clear after standing at room temperature. This product is stable for several weeks at 4°C as an undiluted liquid. Dilute only prior to immediate use. Expiration date is one (1) year from date of opening.

This antibody has been tested by ELISA and western blotting. The antibody may be used for other applications, such as RIA, immunohistochemistry or immunoprecipitation, but specific reaction conditions have not been developed.