Abstract
The Cgamma2 homology region of rabbit IgG does not behave like a domain. Thus, there is no trans-interaction between the two Cgamma2 regions; instead there is an unusual cis-interaction between Cgamma2 and Cgamma3 regions. The observations were made on the plasmin digestion products Facb (IgG minus the Cgamma3 region) and pFc' (Cgamma3 region), which did not dissociate under neutral conditions but dissociated in 3M guanidine solution (that is, cis-interaction between Cgamma2 and Cgamma3). The Facb fragment split into subunits with equal molecular weights under neutral conditions on partial reduction and alkylation (that is, lack of trans-interaction between the two Cgamma2 in the molecule).
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