The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2016
Filed:
Dec. 03, 2013
Nat'l Institute of Advanced Industrial Science and Technology, Tsukuba-shi, Ibaraki, JP;
Abstract
A modified protein of an extracellular domain of protein A, which has the reduced ability to bind to immunoglobulin in an acidic region, compared with the wild-type extracellular domain of protein A, without impairing a selective antibody-binding activity in a neutral region. On the basis of three-dimensional structure coordinate data on a complex of the extracellular domain of protein A bound with the Fc region of immunoglobulin G, the modified protein is obtained by the substitution of amino acid residues that are located within the range of 10 angstroms from the Fc region and have a 20% or more ratio of exposed surface area, by histidine residues. Preferably, the modified protein is obtained by the substitution of amino acid residues at sites identified from the analysis of sequences selected from a library constituted by the protein group, by histidine residues. These substitutions may be combined.