Characterization of structural domains of the human epidermal growth factor receptor obtained by partial proteolysis.

作者: M Chinkers , J S Brugge

DOI: 10.1016/S0021-9258(18)90895-1

关键词:

摘要: Partial cleavage with trypsin has been used to study the structure of epidermal growth factor (EGF) receptor purified from human carcinoma cells. Following affinity labeling 125I-EGF or ATP analogue 5'-p-fluorosulfonyl benzoyl[14C]adenosine, metabolic [35S]methionine, [3H]glucosamine, [32P]orthophosphate, in vitro autophosphorylation [gamma-32P]ATP, tryptic defines following three regions 180-kDa protein: 1) a 125-kDa trypsin-resistant domain which contains sites glycosylation, EGF binding, and an EGF-specific threonine phosphorylation site; 2) adjacent 40-kDa fragment serine is further cleaved 30-kDa domain; 3) terminal 15-kDa portion that tyrosine degraded small fragments presence trypsin. Both 125- appear be required for receptor-associated protein kinase activity since separation these by abolishes this activity, both are specifically labeled analogue, suggesting involved binding. Additional 63- 48-kDa phosphorylated generated upon treatment EGF-treated The potential usefulness partial studying possible biological function discussed.

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