In vitro evolutional selection of a combinatorial phage library displaying randomly-rearranged various binding domains of SpA and SpG with four human IgG subclasses / 生物工程学报
Chinese Journal of Biotechnology
;
(12): 1093-1105, 2012.
Article
in Chinese
| WPRIM
| ID: wpr-342413
ABSTRACT
Protein A and protein G are two well-defined immunoglobulin (Ig)-binding proteins (IBPs), which show affinity for specific sites on Ig of mammalian hosts. Protein A and protein G contained several highly homologous IgG-binding domains which had been demonstrated to have function to bind to IgG. Whether combinations of Ig-binding domains of various IBPs could produce useful novel binding properties remains interesting. We constructed a combinatorial phage library which displayed randomly-rearranged A, B, C, D and E domains of protein A, B2 and B3 domains of protein G. Four rounds molecular evolution of this library directed by all four human IgG subclasses respectively generated a common arrangement of D-C respectively which didn't exist in SpA. The dynamic loss of control phages and increase of the phages displaying two or more binding domains, especially the selective enrichment of D-C and strict selection of its linking peptides demonstrated the efficient molecular evolutions and the significance of the selected D-C arrangement. The phage binding assays confirmed that D-C possessed a binding advantage with four human IgG subclasses compared to SpA. In this work, a novel combination of Ig-binding domains, D-C, was obtained and presented the novel Ig binding properties which provided a novel candidate molecule for the purification, production and detection of IgG antibodies and a new approach for the further study of structures and functions of IBPs.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Staphylococcal Protein A
/
Bacterial Proteins
/
Binding, Competitive
/
Binding Sites
/
Immunoglobulin G
/
Molecular Sequence Data
/
Sequence Alignment
/
Amino Acid Sequence
/
Evolution, Molecular
/
Peptide Library
Type of study:
Controlled clinical trial
Language:
Chinese
Journal:
Chinese Journal of Biotechnology
Year:
2012
Type:
Article
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