Applied Microbiology and Biotechnology

, Volume 102, Issue 9, pp 4039–4048 | Cite as

The second conserved motif in bacterial laccase regulates catalysis and robustness

  • Lanna Jin
  • Xue Yang
  • Yongjie Sheng
  • Hao Cao
  • Aixin Ni
  • Yingjiu Zhang
Biotechnologically relevant enzymes and proteins
  • 112 Downloads

Abstract

Laccase (EC1.10.3.2), an oxidase that binds multiple copper ions, is heterogeneous in different species, implying diversity in its function. Nevertheless, the four copper-binding motifs are conserved in most laccases, especially bacterial forms. In order to exploit laccase more widely and more effectively in industrial processes, we investigated the regulatory effects, if any, of the second conserved copper-binding motif in the bacterial laccases CAR2 and CAHH1. The data suggested that three critical amino acid residues His155, His157, and Thr/Ala158 in this motif strongly regulated laccase’s catalysis, substrate range, and robustness. Indeed, these residues were essential for laccase’s catalytic activity. The data also suggested that laccase’s catalytic efficiency and activity are not completely consistent with its stability, and that the enzyme might have evolved naturally to its favor stability. This study provides important insights into the second conserved copper-binding motif and defines some of the previously undefined amino acid residues in this conserved motif and their significances.

Keywords

Bacterial laccase Conserved motif Catalysis Oxidation Robustness 

Notes

Acknowledgements

We thank Xun Chen for help with the computational docking studies.

Compliance with ethical standards

Conflict of interest

All the authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

253_2018_8863_MOESM1_ESM.pdf (1.6 mb)
ESM 1 (PDF 1627 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Lanna Jin
    • 1
  • Xue Yang
    • 1
  • Yongjie Sheng
    • 1
  • Hao Cao
    • 1
    • 3
  • Aixin Ni
    • 1
  • Yingjiu Zhang
    • 1
    • 2
  1. 1.Key Laboratory for Molecular Enzymology and Engineering of the Ministry of EducationJilin UniversityChangchunPeople’s Republic of China
  2. 2.School of Life ScienceJilin UniversityChangchunPeople’s Republic of China
  3. 3.School of Life Science and BiopharmaceuticsShenyang Pharmaceutical UniversityShenyangPeople’s Republic of China

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