Janelia Fluor 635, SE (JF635, SE) is a red fluorogenic fluorescent dye containing an NHS ester that can be conjugated with primary amine groups. JF635, SE can be used for live cell imaging [1]. Janelia Fluor fluorescent dyes can be chemically conjugated to the specific HaloTag substrate (a chloroalkane ligand) to form a fluorescent ligand, rather than binding directly to the HaloTag protein itself. Janelia Fluor products are licensed under U.S. Pat. Nos. 9,933,417, 10,018,624 and 10,161,932 and other patents from Howard Hughes Medical Institute (Ex/Em = 635/652 nm).
In Vitro, Janelia Fluor fluorescent dyes do not inherently possess HaloTag-binding activity; however, reactive groups such as NHS esters serve as reaction sites for covalent coupling-via chemical synthesis-to an amino-functionalized HaloTag chloroalkane ligand scaffold, thereby yielding a fluorescent HaloTag ligand.
References:
[1]. Grimm JB, et al. A general method to fine-tune fluorophores for live-cell and in vivo imaging. Nat Methods. 2017;14(10):987-994.
In Vitro, Janelia Fluor fluorescent dyes do not inherently possess HaloTag-binding activity; however, reactive groups such as NHS esters serve as reaction sites for covalent coupling-via chemical synthesis-to an amino-functionalized HaloTag chloroalkane ligand scaffold, thereby yielding a fluorescent HaloTag ligand.
References:
[1]. Grimm JB, et al. A general method to fine-tune fluorophores for live-cell and in vivo imaging. Nat Methods. 2017;14(10):987-994.