Thermo Scientific™

EZ-Link™ HPDP-Biotin

Catalog number:  21341

 Related applications:

Protein Labeling & Crosslinking

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Thermo Scientific EZ-Link HPDP-Biotin is pyridyldithiol-activated, sulfhydryl-reactive biotinylation reagent that conjugates via a cleavable (reversible) disulfide bond to enable use in a variety of purification methods.

Features of EZ-Link HPDP-Biotin:

Protein labeling—biotinylate antibodies or other proteins for use in protein methods
Thiol-reactive—reacts with sulfhydryls (-SH), such as the side-chain of cysteine (C)
Pyridyldithiol-activated—perform reactions at pH 6.5 to 7.5 in buffers such as PBS
Reversible—forms disulfide bonds, which can be cleaved using DTT or other reducing agent
Solubility—must be dissolved in DMSO or DMF before further dilution in aqueous buffers
Medium length—spacer arm (total length added to target) is 29.2 angstroms

HPDP-Biotin is a pyridyldithiol-biotin compound for labeling protein cysteines and other molecules that contain sulfhydryl groups. This reagent specifically reacts with reduced thiols (-SH) in near-neutral buffers to form reversible disulfide bonds. HPDP-Biotin is useful for labeling and affinity-purification applications that require recovery of the original, unmodified molecule. For example, a protein can be biotinylated, allowed to bind its interactor, then captured to a streptavidin column and finally eluted and recovered by reduction of the disulfide bond with dithiothreitol.

We manufacture biotin reagents to ensure the highest possible overall product integrity, consistency and performance for the intended research applications.

Biotinylation reagents differ in reactivity, length, solubility, cell permeability and cleavability. Three types of sulfhydryl-reactive compounds are available: maleimido, iodoacetyl and pyridyldithiol. Pyridyldithiol reagents specifically react with sulfhydryl groups (-SH) in near-neutral buffers to form reversible disulfide bonds.

In proteins, sulfhydryls exist where there are cysteine (C) residues. Cystine disulfide bonds must be reduced to make sulfhydryl groups available for labeling. Hinge-region disulfide bridges of antibodies can be selectively reduced to make functional half-antibodies that can be labeled.

• Retrieve cell surface receptors and cleave the biotin away on an immobilized avidin column
For Research Use Only. Not for use in diagnostic procedures.


Cell Permeability: Cell-Permeant
Spacer: Cleavable, Long
Chemical Reactivity: Thiol
Label or Dye: Biotin
Product Line: EZ-Link™
Product Size: 50 mg
Solubility: DMF (Dimethylformamide), DMSO (Dimethylsulfoxide)

Contents & storage

Store at 4°C.


Manuals & protocols