The 5G6 monoclonal antibody specifically recognizes Sialic acid-binding Ig-like lectin 10 (Siglec-10). Siglec-10 is a type I transmembrane glycoprotein encoded by SIGLEC10 that belongs to the SIGLEC (sialic acid binding Ig-like lectin) family within the immunoglobulin superfamily. The extracellular region of Siglec-10 contains five Ig-like domains including an N-terminal V-set domain that contains the sialic acid-binding site and four C2-set domains. Siglec-10 preferentially binds to glycoconjugates containing α2,3- or α2,6-linked sialic acids present on human cell surfaces and may function as an adhesion receptor. Its cytoplasmic region contains two immunoreceptor tyrosine-based inhibitory motifs (ITIM) that upon phosphorylation can bind the SH2 domains of several SH2-containing phosphatases. This CD33-related Siglec has a mouse ortholog designated Siglec-G. Siglec-10 is expressed on B cells, eosinophils, monocytes, and a subset of CD16+CD56- natural killer (NK) cells. It may play a role as an inhibitory receptor for leucocytes involved in innate and adaptive immunity. The 5G6 antibody reportedly did not crossreact with Siglecs 3, 5, 7, 8 and 9.
The antibody was conjugated to BD Horizon BV421 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max at 421-nm, BD Horizon BV421 can be excited by the violet laser and detected in the standard Pacific Blue™ filter set (eg, 450/50-nm filter). BD Horizon BV421 conjugates are very bright, often exhibiting a 10 fold improvement in brightness compared to Pacific Blue conjugates.