Maturation processing and characterization of streptopain

Chiu Yueh Chen, Shih Chi Luo, Chih Feng Kuo, Yee Shin Lin, Jiunn Jong Wu, Ming T. Lin, Ching Chuan Liu, Wen Yih Jeng, Woei Jer Chuang

研究成果: Article同行評審

51 引文 斯高帕斯(Scopus)

摘要

Streptopain is a cysteine protease expressed by Streptococcus pyogenes. To study the maturation mechanism of streptopain, wild-type and Q186N, C192S, H340R, N356D and W357A mutant proteins were expressed in Escherichia coli and purified to homogeneity. Proteolytic analyses showed that the maturation of prostreptococcal pyrogenic exotoxin B zymogen (pro-SPE B) involves eight intermediates with a combination of cis- and trans-processing. Based on the sequences of these intermediates, the substrate specificity of streptopain favors a hydrophobic residue at the P2 site. The relative autocatalytic rates of these mutants exhibited the order Q186N > W357A > N356D, C192S, H340R. Interestingly, the N356D mutant containing protease activity could not be converted into the 28-kDa form by autoprocessing. This observation suggested that Asn356 might involve the cis-processing of the propeptide. In addition, the maturation rates of pro-SPE B with trypsin and plasmin were 10- and 60-fold slower than that with active mature streptopain. These findings indicate that active mature streptopain likely plays the most important role in the maturation of pro-SPE B under physiological conditions.

原文English
頁(從 - 到)17336-17343
頁數8
期刊Journal of Biological Chemistry
278
發行號19
DOIs
出版狀態Published - 2003 五月 9

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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