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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Binding of thyroglobulin to bovine thyroid membranes. Role of specific amino acids in receptor recognition.

Bovine thyroglobulin was treated with increasing ratios of succinic anhydride, trinitrobenzene sulfonic acid, tetranitromethane, and N-acetylimidazole in an attempt to assess the role of lysine or tyrosine residues in binding to thyroid membrane receptors. Extensive succinylation results in dissociation to 12 S thyroglobulin with retention of a considerable portion of the three-dimensional structure. Only 25% of the lysine residues can be modified by trinitrophenylation without affecting inter-subunit interactions. Succinylation as well as trinitrophenylation increases the affinity of thyroglobulin for the membrane receptor by a factor of 2. The binding of thyroglobulin to the membrane was reduced after nitration of 30% of the tyrosyl residues with tetranitromethane. O-Acetylation of 40-70% of the tyrosyl residues by N-acetylimidazole nearly abolished the ability of thyroglobulin to bind to the membrane. Removal of the O-acetyl group with hydroxylamine restored the binding properties. The results indicate that tyrosyl residues play an important role in thyroglobulin interactions with thyroid membranes.[1]


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