Patent ID: 9150641
Filing Date: 2015-10-06
Classification: C07K

Abstract:
1. A method for producing an immunoglobulin comprising the following steps a) aligning the amino acid sequence of the fourth heavy chain framework region of the immunoglobulin with the reference sequence xxxxTxxTxxx (SEQ ID NO: 11) to achieve maximal level of amino acid sequence identity, b) identifying aligned amino acid positions with a hydrophobic or non-polar amino acid residue at one or two positions selected from position 5, position 8, and position 5 and position 8 in the fourth heavy chain framework region c) modifying the immunoglobulin by substituting an amino acid residue in the fourth heavy chain framework region at one or two positions identified in b), which is threonine in the reference sequence and which is not threonine in the fourth heavy chain framework region, for the respective threonine residue as in the reference sequence, d) cultivating a mammalian cell comprising the nucleic acid encoding the modified immunoglobulin heavy chain amino acid sequence and a nucleic acid encoding a corresponding light chain amino acid sequence for the expression of the immunoglobulin heavy and light chain, and e) recovering the immunoglobulin from the mammalian cell or the cultivation medium and thereby producing an immunoglobulin.