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Fine-structure epitope mapping of antierythropoietin monoclonal antibodies
reveals a model of recombinant human erythropoietin structure
S Elliott, T Lorenzini, D Chang, J Barzilay, E Delorme, J Giffin and L Hesterberg
Amgen Inc, Thousand Oaks, CA, USA.
We have isolated and mapped the rHuEPO epitopes for three noncompeting
anti-EPO monoclonal antibodies (MoAbs). The MoAb 9G8A recognizes a linear
epitope that includes amino acids 13, 16, and 17. MoAb F12 recognizes a
conformational epitope that includes amino acids 31 through 33, 86 through
91, and 138. MoAb D11 recognizes a conformational epitope that includes
amino acids 64 through 78 and 99 through 110. MoAb D11 neutralizes rHuEPO
activity which suggests that its epitope may contain the receptor binding
domain. Analysis of the effect of mutations on folding allowed the
identification of buried residues, alpha-helical, and non alpha-helical
regions. This data along with epitope mapping data of anti rHuEPO
monoclonals was used to model rHuEPO protein structure. A model consistent
with the data is a 4-helix bundle with short and long interconnecting
loops.
Volume 87,
Issue 7,
pp. 2702-2713,
04/01/1996
Copyright © 1996 by The American Society of Hematology

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