In situ maleimide bridging of disulfides and a new approach to protein PEGylation.

In situ maleimide bridging of disulfides and a new approach to protein PEGylation.
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DOI:
10.1021/bc1004685
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发表时间:
2011-02-16
影响因子:
4.7
通讯作者:
Baker, James R.
Baker, James R.
中科院分区:
化学2区
文献类型:
--
作者:
Schumacher, Felix F.;Nobles, Muriel;Ryan, Chris P.;Smith, Mark E. B.;Tinker, Andrew;Caddick, Stephen;Baker, James R.

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通过化学修饰将非天然实体引入蛋白质中在基础生物科学以及肽和蛋白质治疗剂的开发和操作中具有许多应用。天然二硫键的还原提供了一种方便的方法来获得两个亲核半胱氨酸残基,其可以用作这种化学修饰的理想连接点。利用这些半胱氨酸残基的最佳生物缀合策略应包括重建桥以模拟二硫键的作用,维持蛋白质的结构和稳定性。此外,桥接化学修饰应尽可能快,以防止与蛋白质解折叠、聚集或二硫键混乱相关的问题。本研究报告的原位二硫键还原桥接策略,确保快速螯合的游离半胱氨酸残基的桥梁,使用二硫代马来酰亚胺。这种方法,然后用于聚乙二醇化的肽激素生长抑素和保留的生物活性被证明。
The introduction of non-natural entities into proteins by chemical modification has numerous applications in fundamental biological science and for the development and manipulation of peptide and protein therapeutics. The reduction of native disulfide bonds provides a convenient method to access two nucleophilic cysteine residues that can serve as ideal attachment points for such chemical modification. The optimum bioconjugation strategy utilizing these cysteine residues should include the reconstruction of a bridge to mimic the role of the disulfide bond, maintaining structure and stability of the protein. Furthermore, the bridging chemical modification should be as rapid as possible to prevent problems associated with protein unfolding, aggregation, or disulfide scrambling. This study reports on an in situ disulfide reduction-bridging strategy that ensures rapid sequestration of the free cysteine residues in a bridge, using dithiomaleimides. This approach is then used to PEGylate the peptide hormone somatostatin and retention of biological activity is demonstrated.
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