The SH1 monoclonal antibody specifically binds to mouse Siglec-G (sialic acid binding immunoglobulin-like lectin G), also known as Siglec10. Siglec-G is a Type I transmembrane glycoprotein that belongs to the Immunoglobulin superfamily. Siglec-G functions as an adhesion molecule that mediates sialic-acid dependent binding to cells. Siglec-G is expressed on cells of the B cell lineage. Siglec-G is most highly expressed by pre-B cells and B1a cells within the B cell lineage and is not detectable on T cells. Siglec-G can inhibit B cell receptor-mediated calcium signaling when it is overexpressed. Mice that lack Siglec-G have significantly increased numbers of B1a cells that begins early in development and is B cell intrinsic. Siglec-G-deficient mice have higher titers of natural IgM antibodies than their normal counterparts. Mouse Siglec-G is the ortholog of human Siglec-10 (also known as, CD330).
The antibody was conjugated to BD Horizon™ BUV563 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 which has an Ex Max of 348 nm and an acceptor dye. The tandem has an Em Max at 563 nm. BD Horizon BUV563 can be excited by the 355 nm ultraviolet laser. On instruments with a 561 nm Yellow-Green laser, the recommended bandpass filter is 585/15 nm with a 535 nm long pass to minimize laser light leakage. When BD Horizon BUV563 is used with an instrument that does not have a 561 nm laser, a 560/40 nm filter with a 535 nm long pass may be more optimal. Due to the excitation and emission characteristics of the acceptor dye, there may be spillover into the PE and PE-CF594 detectors. However, the spillover can be corrected through compensation as with any other dye combination.