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Table 6 Comparison of biochemical characterisation of B. tropicus Gxun-17 and some microbial keratinase

From: Isolation and identification of a feather degrading Bacillus tropicus strain Gxun-17 from marine environment and its enzyme characteristics

Microbial source Activity (U/mL) Optimum temperature (℃) Optimum pH Promoter References
B. tropicus Gxun-17 112.57 60 7.0 Mn2+ and mercaptoethanol This study
B. licheniformis ALW1 72.2 65 8.0 [8]
Ochrobactrum 117 40 9.0 K+, Na+, Ca2+, Mg2+, Dithiothreitol (DTT) and Urea [13]
Bacillus sp. NKSP-7 139.35 65 7.5 Ca2+, Cd2+, Na+, Mn2+, sodium sulfite and mercaptoethanol [19]
B. zhangzhouensis 117.04 60 9.5 Ca2+, K+, Na+, Mn2+ and DTT [29]
Thermoactinomyces sp. RM4 80 10.0 Na+, K+, DTT, mercaptoethanol and toluene [32]
B. subtilis P13 65 7.0 TritonX 100 [38]
B. subtilis KD-N2 55 8.5 SDS, EDTA, DTT, ammonium sulfamate and mercaptoethanol [40]
B. licheniformis 10.76 60 7.0 Zn2+ and Mg2+ [45]
  1.  − : No mention