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3 Biotech

, 9:171 | Cite as

Biochemical characterization of a key laccase-like multicopper oxidase of artificially cultivable Morchella importuna provides insights into plant-litter decomposition

  • Qiang Zhang
  • Renyun Miao
  • Tianhai Liu
  • Zhongqian Huang
  • Weihong Peng
  • Bingcheng Gan
  • Xiaoping ZhangEmail author
  • Hao TanEmail author
Original Article
  • 74 Downloads

Abstract

The aim of this study is to determine the key laccase-encoding gene in the life cycle of Morchella importuna SCYDJ1-A1, and to characterize the biochemical properties of the laccase. Two laccase-like multicopper oxidase (LMCO) genes were identified in the genome of M. importuna SCYDJ1-A1 as putative laccase-encoding genes. The two genes, belonging to Auxiliary Activity family 1 subfamily 3, were named as MiLacA and MiLacB. Phylogenetic analysis of deduced amino acid sequences showed that MiLacA is closest to a LMCO of M. importuna 22J1, while MiLacB had low similarity with known Morchella LMCOs. Real-time quantitative PCR results showed that MiLacA was expressed at much higher levels than MiLacB throughout the entire course of artificial cultivation. MiLacA was overexpressed in Pichia pastoris as a recombinant protein. Biochemical characterization of the purified enzyme showed that MiLacA simultaneously possessed laccase and polyphenol-oxidase activities. MiLacA could be strongly inhibited by Fe2+, which is unusual. The optimum pH was four and optimum temperature was 60 °C. The enzyme retained over 74% of the laccase activity after 16-h incubation at 60 °C, which means that its thermostability is at the forefront among the currently known laccases. Our findings may help to elucidate how the laccase of M. importuna is involved in decaying lignin in plant litter, and could also provide a candidate thermostable laccase for potential industrial application.

Keywords

Morchella importuna SCYDJ1-A1 AA1_3 family Laccase-like multicopper oxidase Transcript level Overexpression Biochemical characterization 

Notes

Acknowledgements

This research was supported by the Sichuan Science and Technology Program (Applied Fundamental Research Project, 2018JY0637), Innovative Improvement Projects of Sichuan Province (2016ZYPZ-028, 2016LWJJ-007), and the Special Fund for Agro-scientific Research in the Public Interest (201503137).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

13205_2019_1688_MOESM1_ESM.pdf (149 kb)
Supplementary material 1 (PDF 148 kb)

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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  1. 1.College of ResourcesSichuan Agricultural UniversityChengduChina
  2. 2.National-local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
  3. 3.Scientific Observing and Experimental Station of Agro-microbial Resource and Utilization in Southwest China, Ministry of AgricultureChengduChina

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