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Table 1 Biochemical characteristics of selected secreted flavin-dependent sulfhydryl oxidases and the enzymes DepH, GliT and HlmI reported to be involved in the secondary metabolism

From: Characterization of sulfhydryl oxidase from Aspergillus tubingensis

 

Biochemical properties

  

Enzyme

MW (kDa)

pH optimum

pH stability

Temperature stability

Cofactor, non covalent

Identity (%) to AtSOX

Reference

AtSOX

55

6.5

> 80% activity after 20 h at pH 4-8.5

> 85% activity after 20 h at 40 °C

FAD

100

This study

AnSOX

53 (dimer)

5.5

n.a.

n.a.

FAD

96.0

[1]

AoSOX1

45 (dimer)

8.0

> 80% activity after 24 h at pH 5-8.5

> 70% activity after 24 h at 40 °C

FAD

64.6

[34]

AoSOX2

45 (dimer)

7.5-8.0

> 80% activity after 24 h at pH 5-8

> 65% activity after 1 h at 60 °C

FAD

46.5

[19]

DepH

34.4 (dimer)

7 (assay)

n.a.

n.a.

FAD

22.0

[27]

GliT

30 (dimer)

6.5 (assay)

n.a.

n.a.

FAD

24.5

[44, 51]

HlmI

39 (dimer)

6.5 (assay)

n.a.

n.a.

FAD

22.3

[49]

  1. Abbreviations: AtSOX secreted SOX from Aspergillus tubingensis, AnSOX secreted SOX from Aspergillus niger (UniProtKB: Q68CM8), AoSOX secreted SOX from Aspergillus oryzae (AoSOX1 UniProtKB: Q2UA33, AoSOX2 UniProtKB: Q2U4P3), DepH enzyme from Chromobacterium violaceum (UniProtKB: A4ZPY8), GliT enzyme from Aspergillus fumigatus (UniProtKB: Q5MBU7), HlmI enzyme from Streptomyces clavuligerus (UniProtKB: E2PZ87), MW molecular weight of the subunit, SOX sulfhydryl oxidase, n.a. not available