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Conjugation With Eight-Arm PEG Markedly Improves the In Vitro Activity and Prolongs the Blood Circulation of Staphylokinase

Conjugation With Eight-Arm PEG Markedly Improves the In Vitro Activity and Prolongs the Blood Circulation of Staphylokinase

Fangbing Qi, Chunyang Hu, Weili Yu, Tao Hu

Bioconjug Chem. 2018 Feb 21;29(2):451-458.

PMID: 29298046

Abstract:

Staphylokinase (SAK) is a profibrinolytic protein and can be used for therapy of acute myocardial infarction and coronary thrombosis. However, SAK suffers from a short serum half-life time (∼6 min) that limits its clinical application. PEGylation prolongs the half-life time of SAK, whereas it significantly decreases the bioactivity of SAK for the steric shielding effect of PEG. To improve the bioactivity and prolong the half-life time of SAK, 8-arm PEG maleimide (8-arm PEG) was used for conjugation of multiple SAK molecules in one entity. C terminus of SAK was engineered with cysteine residue, followed by reaction with the maleimide moieties of 8-arm PEG to obtain the conjugate (SAKp-PEG). Conjugation with 8-arm PEG retained the secondary structure of SAK, slightly perturbed the tertiary structure of SAK, and essentially maintained its in vitro bioactivity by the multivalence of SAK. Conjugation with 8-arm PEG increased the hydrodynamic volume and thus significantly prolonged the half-life time of SAK. SAKp-PEG elicited a 1.4-fold increase in the SAK-specific IgG titers as compared with SAK, and rendered no apparent toxicity to the cardiac, liver and renal functions of mice. Thus, multiple conjugation of a protein with 8-arm PEG was an effective strategy to develop a long-acting protein drug with improved bioactivity and prolonged blood circulation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS7411292	8-arm PEG5K-PLA1K-Acrylate			Price

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