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Iodination-induced alterations in biochemical properties of human placental insulin receptor
1Dept of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461.
Abstract:
Insulin receptors from human placenta have been labeled by using an oxidative iodination procedure (iodogen-mediated or chloramine-T-mediated), Bolton-Hunter reagent or [3H]acetic anhydride. The oxidative iodination procedure reduces the affinity for 131I-insulin and the receptor protein becomes fragmented into smaller pieces with an s20,w value of 5-6. However, treatment with Bolton-Hunter reagent or [3H]acetic anhydride does not alter the Kd of 131I-insulin binding and the s20,w value remains unchanged with respect to the native receptor. It is proposed that for labeling multisubunit sulfhydryl-linked protein drastic oxidative iodination procedures should be avoided.
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