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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