Abstract
Conjugates of recombinant human tumor necrosis factor alpha (TNFα) and alendronic acid linked through the protein sulfhydryl, carboxyl, and amino groups were obtained with crosslinking agents of different types. The conjugation reactions were conducted in solution and on a solid phase. Unlike the conjugation reactions in solution, the method involving immobilization of active components on a hydroxyapatite column was shown to result in the conjugates with a specified stoichiometry and a high degree of homogeneity. The TNFα conjugates retained the specific cytolytic activity and demonstrated the higher affinity to hydroxyapatite, an analogue of the bone mineral matrix, than TNFα.
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