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. 2015 Jul 16;99(22):9635–9649. doi: 10.1007/s00253-015-6805-9

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Degradation of keratinaceous materials by culture broth, fractions of culture broth, purified recombinant protease, and enzyme blends. a Treatment with different fractions of culture broth. b Treatment with blends of different fractions of culture broth and recombinant protease 6877. The degree of degradation was calibrated to negative control. Fraction labels beginning with A and C refer to anion (A) and cation (C) exchanged fractions, respectively. 6877 is the purified recombinant protease expressed in P. pastoris. Positive controls: culture broth supernatant from O. corvina grown for 11 days on fermentation medium with pig bristle (P) and chicken feathers (C), respectively. Negative control: 2× McIlvaine buffer (pH 8)