Half-life extension of a single-chain diabody by fusion to domain B of staphylococcal protein A.
Half-life extension of a single-chain diabody by fusion to domain B of staphylococcal protein A.
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通过与葡萄球菌蛋白 A 的结构域 B 融合来延长单链双抗体的半衰期
DOI:
10.1093/protein/gzr061
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
Kontermann
中科院分区:
文献类型:
--
作者:
Unverdorben;Färber-Schwarz;Richter;Kontermann
Binding of a therapeutic protein to a long-circulating plasma protein can result in a strongly extended half-life. Among these plasma proteins, albumin and immunoglobulins are of special interest because of their exceptionally long half-life, which is to a great extent determined by recycling through the neonatal Fc receptor (FcRn). Many strategies have been established employing reversible binding to albumin, e.g. using an albumin-binding domain from streptococcal protein G. We show here that the half-life of a recombinant antibody molecule can also be prolonged by fusion to a single immunoglobulin-binding domain (IgBD) from staphylococcal protein A. This domain (domain B, SpAB) is composed of 56 amino acid residues and was fused to the C-terminus of a bispecific single-chain diabody (scDb). The scDb-SpABfusion protein was produced in HEK293 cells and retained its antigen-binding activity as shown by enzyme-linked immunosorbent assay and flow cytometry. Furthermore, the fusion protein was capable of binding to human and mouse IgG in a pH-dependent manner. In mice, the terminal half-life of the fusion protein was improved from ∼1–2 h of the unmodified scDb to 11.8 h. Although the fusion protein did not reach the long half-life seen for IgG, our results established the applicability of a single bacterial IgBD for half-life extension purposes.
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