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http://dx.doi.org/10.4014/jmb.1708.08077

Biodegradation of Feather Waste Keratin by the Keratin-Degrading Strain Bacillus subtilis 8  

He, Zhoufeng (College of Life Science, Sichuan Agricultural University)
Sun, Rong (College of Life Science, Sichuan Agricultural University)
Tang, Zizhong (College of Life Science, Sichuan Agricultural University)
Bu, Tongliang (College of Life Science, Sichuan Agricultural University)
Wu, Qi (College of Life Science, Sichuan Agricultural University)
Li, Chenlei (College of Life Science, Sichuan Agricultural University)
Chen, Hui (College of Life Science, Sichuan Agricultural University)
Publication Information
Journal of Microbiology and Biotechnology / v.28, no.2, 2018 , pp. 314-322 More about this Journal
Abstract
Bacillus subtilis 8 is highly efficient at degrading feather keratin. We observed integrated feather degradation over the course of 48 h in basic culture medium while studying the entire process with scanning electron microscopy. Large amounts of ammonia, sulfite, and $\text\tiny{L}$-cysteic acid were detected in the fermented liquid. In addition, four enzymes (gamma-glutamyltranspeptidase, peptidase T, serine protease, and cystathionine gamma-synthase) were identified that play an important role in this degradation pathway, all of which were verified with molecular cloning and prokaryotic expression. To the best of our knowledge, this report is the first to demonstrate that cystathionine gamma-synthase secreted by B. subtilis 8 is involved in the decomposition of feather keratin. This study provides new data characterizing the molecular mechanism of feather degradation by bacteria, as well as potential guidance for future industrial utilization of waste keratin.
Keywords
Bacillus subtilis; keratin; purification; degradation mechanism; prokaryotic expression;
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