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Identification of Binding Sites on Human Serum Albumin for Somapacitan, a Long-Acting Growth Hormone Derivative
Biochemistry ( IF 2.9 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.biochem.0c00019
Eva Johansson 1 , Anders D. Nielsen 1 , Helle Demuth 1 , Charlotte Wiberg 1 , Christine B. Schjødt 2 , Tao Huang 3 , Jianhe Chen 3 , Sanne Jensen 1 , Jørgen Petersen 1 , Peter Thygesen 1
Affiliation  

Somapacitan, a human growth hormone derivative that binds reversibly to albumin, was investigated for human serum albumin (HSA) and HSA domain binding. Isothermal titration calorimetry (ITC) binding profiles showed high-affinity binding (∼100–1000 nM) of one somapacitan molecule and low-affinity binding (∼1000–10000 nM) of one to two somapacitan molecules to HSA. The high-affinity site was identified in HSA domain III using size exclusion chromatography (SEC) and ITC. SEC studies showed that the neonatal Fc receptor shields one binding site for somapacitan, indicating its position in domain III. A crystal structure of somapacitan in complex with HSA optimized for neonatal Fc receptor binding, having four amino acid residue replacements, identified a low-affinity site in fatty acid-binding site 6 (domain II). Surface plasmon resonance (SPR) showed these replacements affect the kinetics of the high-affinity binding site. Furthermore, small-angle X-ray scattering and SPR brace two somapacitan-binding sites on HSA.

中文翻译:

人血白蛋白,长效生长激素衍生物的人血清白蛋白上的结合位点的确定。

Somapacitan是一种与白蛋白可逆结合的人类生长激素衍生物,已被研究用于人类血清白蛋白(HSA)和HSA域结合。等温滴定量热法(ITC)的结合图谱显示,一个索马培南分子具有高亲和力结合(〜100–1000 nM),一到两个索马培南分子具有低亲和力结合(〜1000–10000 nM)与HSA。使用大小排阻色谱(SEC)和ITC在HSA域III中鉴定了高亲和力位点。SEC研究表明,新生儿Fc受体屏蔽了索马帕西汀的一个结合位点,表明其在结构域III中的位置。Somapacitan与HSA配合物的晶体结构经过优化,适用于新生儿Fc受体结合,具有四个氨基酸残基置换,在脂肪酸结合位点6(结构域II)中鉴定出低亲和力位点。表面等离振子共振(SPR)表明,这些替代影响高亲和力结合位点的动力学。此外,小角度X射线散射和SPR支持HSA上的两个somapacitan结合位点。
更新日期:2020-03-30
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