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Pierce Iodination Beads


A convenient and effective method for iodinating proteins.

Pierce Iodination Beads

Thermo Scientific Pierce Iodination Beads are 3mm-diameter polystyrene beads that are coated with an oxidizing reagent, which provides efficient activation of iodine-125 for protein or peptide iodination procedures.

The coated iodination beads provide for convenient and efficient iodine-labeling without the hassles and damaging oxidative effects normally associated with chloramine T and other solution-based methods. One or two beads can be added per milliliter of protein solution and then easily removed following the labeling reaction, thereby completely removing the oxidizing reagent from the protein.

Highlights:

  • Derivatized, uniform, nonporous polystyrene beads
  • Remarkably reproducible iodinations
  • Iodine-125 incorporation as high as 99%; labeled protein recovery > 90%
  • Functions over a broad pH and temperature range
  • Iodinates in the presence of azides, detergents, urea and high salt
  • Allows efficient iodination of cell membrane surface proteins
  • More gentle method for iodination than soluble chloramine-T because there is no contact between the protein and the immobilized oxidizing agent (Markwell, 1982)
  • Fast and easy to use…iodinations complete in 2-15 minutes
  • Reaction stopped by simply removing beads from reaction mixture with tweezers or pasteur pipet; no reducing agent necessary to terminate reaction
  • More control over the incubation time
  • Iodinate up to 500 µg of tyrosine-containing peptide or protein/bead
  • Can be used to quantitatively iodinate histidine at pH 8.22

Product Details:

Chemical structure of Thermo Scientific Pierce Iodination Beads -- IODO-BEADS
Chemical structure of Thermo Scientific Pierce Iodination Beads.

Iodination involves the introduction of radioactive iodine into certain amino acids (usually tyrosines) in proteins and peptides. Iodination takes place at the positions ortho to the hydroxyl group on tyrosine; mono- or di-substitution can occur. When iodinatable sites such as tyrosines are absent or of limited accessibility in a protein, iodinatable phenolic sites can be introduced by using the Bolton-Hunter Reagents (SHPP and Sulfo-SHPP). Certain crosslinkers also contain iodinatable tyrosyl groups in their spacer arms.

Radioactive 125-I or 131-I can be incorporated into proteins either by enzymatic or chemical oxidation. In the chemical oxidation method, sodium iodide is converted to its corresponding reactive iodine form, which then spontaneously incorporates into tyrosyl groups. While necessary for iodine activation, oxidizing reagents are potentially damaging to proteins. The solid-phase arrangement provided by the Iodination Beads (previously called IODO-BEADS) minimizes damaging effects. 

References:

  1. Markwell, M.A.K. (1982). A new solid-state reagent to iodinate proteins: conditions for the efficient labeling of antiserum. Anal. Biochem. 125, 427-432.
  2. Tsomides, T.J., Walker, B.D. and Eisen, H.N. (1991). An optimal viral peptide recognized by CD8+ T cells binds very tightly to the restricting class I major histocompatibility complex protein on intact cells but not to the purified class I protein. PNAS 88, 11276-11280.

Related Products:

Pierce Iodination Reagent
Pierce Iodination Tubes
Sulfo-SHPP (Water Soluble Bolton-Hunter Reagent)


Ordering Information
 
Product # Description Pkg. Size Instructions MSDS CofA Price
28665 Pierce Iodination Beads
Formulation: Polystyrene beads (3mm dia.) coated with iodination reagent
Sufficient For: 10 to 50 reactions, each with 0.1 to 0.5 mg of protein
50 beads Product Instructions for product #28665 Pierce Iodination Beads MSDS for product #28665 Pierce Iodination Beads Certificate of Analysis for product #28665 Pierce Iodination Beads $146.00

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28666 Pierce Iodination Beads
Formulation: Polystyrene beads (3mm dia.) coated with iodination reagent
Sufficient For: 25 to 250 reactions, each with 0.1 to 0.5 mg of protein
250 beads Product Instructions for product #28666 Pierce Iodination Beads MSDS for product #28666 Pierce Iodination Beads Certificate of Analysis for product #28666 Pierce Iodination Beads $344.00

Add to cart

Instructions | MSDS | CofA
Product Instructions | MSDS | CofA  

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