The 108928 monoclonal antibody specifically recognizes the Mer tyrosine kinase (Mer or MerTK). Mer is a single-pass type I transmembrane glycoprotein that is encoded by Mertk (c-mer proto-oncogene tyrosine kinase) and is also known as Eyk, Nyk, Tyro 12, or Nmf12. Mer is comprised of an extracellular region with two immunoglobulin (Ig)-like domains and two fibronectin type III (FNIII) domains, a transmembrane segment and a conserved intracellular tyrosine kinase domain. Tyro-3, Axl, and Mer constitute the TAM subfamily of receptor tyrosine kinases (RTK). Mer is variably expressed by multiple cell types including monocytes, macrophages, dendritic cells, NK cells, platelets, and epithelial cells including retinal pigment epithelial cells. Mer binds to the vitamin K-dependent Growth arrest-specific protein 6 (Gas6) and to Protein S (ProS) through its extracellular Ig-like domains. Ligand binding leads to receptor dimerization, and autophosphorylation of tyrosine residues within the cytoplasmic Mer domains. This results in the activation of downstream signaling pathways that control cellular adhesion, aggregation, phagocytosis/efferocytosis, proliferation, survival, and migration. Through these activities, Mer plays major roles involved in development and in the regulation of hematopoiesis and immunity. Abnormal expression of Mer has been observed in various cancers and by certain tumor cell lines.
This antibody is conjugated to BD Horizon™ BV605 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max of 602-nm, BD Horizon BV605 can be excited by a violet laser and detected with a standard 610/20-nm filter set. BD Horizon BV605 is a tandem fluorochrome of BD Horizon BV421 and an acceptor dye with an Em max at 605-nm. Due to the excitation of the acceptor dye by the green (532 nm) and yellow-green (561 nm) lasers, there will be significant spillover into the PE and BD Horizon PE-CF594 detectors off the green or yellow-green lasers. BD Horizon BV605 conjugates are very bright, often exhibiting brightness equivalent to PE conjugates and can be used as a third color off of the violet laser.
