Applied Microbiology and Biotechnology

, Volume 101, Issue 8, pp 3247–3258 | Cite as

Immobilization of alkaline polygalacturonate lyase from Bacillus subtilis on the surface of bacterial polyhydroxyalkanoate nano-granules

  • GanQiao Ran
  • Dan Tan
  • WeiEr Dai
  • XinLiang Zhu
  • JiPing Zhao
  • Qi MaEmail author
  • XiaoYun LuEmail author
Biotechnologically relevant enzymes and proteins


Alkaline polygalacturonate lyase (PGL), one of the pectinolytic enzymes, has been widely used for the bioscouring of cotton fibers, biodegumming, and biopulp production. In our study, PGL from Bacillus subtilis was successfully immobilized on the surface of polyhydroxyalkanoate (PHA) nanogranules by fusing PGL to the N-terminal of PHA synthase from Ralstonia eutropha via a designed linker. The PGL-decorated PHA beads could be simply achieved by recombinant fermentation and consequent centrifugation. The fused PGL occupied 0.985% of the total weight of purified PHA granules, which was identified by mass spectrometer-based quantitative proteomics. The activity of immobilized PGL (184.67 U/mg PGL protein) was a little lower than that of the free PGL (215.93 U/mg PGL protein). The immobilization process did not affect the optimal pH and the optimal temperature of the PGL, but it did enhance the thermostability as well as the pH stability at certain conditions, which will extend the practicability of the immobilized PGL-PHA beads in the alkaline and generally harsh bioscouring process. Furthermore, the immobilized PGL still retained more than 60% of its initial activity after 8 cycles of reuse. Our study provided a novel and promising approach for cost-efficient in vivo PGL immobilization, contributing to wider commercialization of this environmental-friendly biocatalyst.


Alkaline polygalacturonate lyase Polyhydroxyalkanoates Immobilization Green chemistry Bioscouring 



This work was financially supported by the National Natural Science Foundation of China (No. 21306110, No. 21602171) and China Postdoctoral Science Foundation (No. 2015M582640). We offer our acknowledgment to both Prof. Alexander Steinbuchel and Prof. Guo-Qiang Chen for kind donation of plasmid pBHR68. Besides, we also thanked Prof. Bernd H. A. Rehm for providing us many suggestions for the granule purification as well as the quantification of immobilized protein.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical statement

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

Supplementary material

253_2016_8085_MOESM1_ESM.xlsx (73 kb)
Table S1 (XLSX 73 kb.)
253_2016_8085_MOESM2_ESM.pdf (377 kb)
Figure S1 (PDF 376 kb.)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and TechnologyXi’an Jiaotong UniversityXi’anPeople’s Republic of China
  2. 2.Institute of Enzyme EngineeringShannxi Academy of ScienceXi’anPeople’s Republic of China

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