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Exploration of Recombinant Streptokinase Degradation Products Under Various pH Reduction Conditions in Downstream Processing

Exploration of Recombinant Streptokinase Degradation Products Under Various pH Reduction Conditions in Downstream Processing

Reza Jalalirad, Alireza Kavianpour, Ahmad Beiroti, Mina Sepahi, Parinaz Tavakoli Zaniani, Firooz Arsalani

Recent Pat Biotechnol. 2016;9(2):139-44.

PMID: 26961670

Abstract:

Background:
Methods of producing streptokinase, which can be used in the treatment of myocardial infarction, by hemolytic streptococci and recombinant E. coli have been described in patents since 1955. Degradation products in active pharmaceutical ingredients (APIs) and finished pharmaceutical products are considered as impurities and it is required that these degradation impurities are minimized or rather avoided throughout manufacturing process.
Objective:
The aim of this study was to explore the occurrence of rSK degradation during acidification step in downstream processing.
Methods:
The polyclonal antibody was produced by immunization of New Zealand white (NZW) rabbit with pure rSK (purity>98%). The solubilized inclusion bodies with various pH values (4.2, 5.0 and 6.0) were analyzed by Western blotting using rSK polyclonal antibody.
Results:
Western blot analysis demonstrated the generation of rSK degradation products (with the molecular weight of about 27, 20 and 17 kDa) when the pH value of the solubilized inclusion bodies was reduced to 5.0 and 4.2, while no degradation of rSK observed at pH 6.0.
Conclusion:
This study demonstrates that the level of pH reduction in the solubilized inclusion bodies during downstream processing plays an important role in generating rSK degradation products, and substantial post-solubilization degradation of rSK occurs at pH lower than 6.0. Development of these degradation impurities, which cannot be eliminated by subsequent chromatographic purifications, can be exclusively avoided during acidification procedure by appropriate pH adjustment approach in downstream processing.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42417054	Anti-phospho-p90 RSK (pThr359+Ser363) antibody produced in rabbit			Price
IAR42417055	Anti-phospho-p90 RSK (pThr573) antibody produced in rabbit			Price

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