Affinity purified Hippeastrum hybrid lectin (HHL) is consists of four subunits of identical size. It binds only to (α-1,3) and (α-1,6) linked mannosyl units of α-mannose residues. HHL reacts not only with terminal but also with internal α-D-mannosyl residues. Lectin appears to possess extended binding sites complementary to at least three 1,6-linked α-mannosyl. HHL also binds to some yeast galactomannans.
Texas Red is a red-fluorescent dye and when bound to Hippeastrum hybrid Lectin (HHL) can show the binding pattern of this lectin in cellular imaging applications. There is very little overlap between the emission spectra of Texas Red and FITC making this combination ideal for dual-labeling experiments. Rhodamine dyes, such as Texas Red, are more photostable and less sensitive to pH change when compared to other dyes such as fluorescein.