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- Title
Photocontrolled reversible self-assembly of dodecamer nitrilase.
- Authors
Yu, Qiao; Wang, Yong; Zhao, Shengyun; Ren, Yuhong
- Abstract
Background: Naturally photoswitchable proteins act as a powerful tool for the spatial and temporal control of biological processes by inducing the formation of a photodimerizer. In this study, a method for the precise and reversible inducible self-assembly of dodecamer nitrilase in vivo (in Escherichia coli) and in vitro (in a cell-free solution) was developed by means of the photoswitch-improved light-inducible dimer (iLID) system which could induce protein-protein dimerization. Results: Nitrilase was fused with the photoswitch protein AsLOV2-SsrA to achieve the photocontrolled self-assembly of dodecamer nitrilase. The fusion protein self-assembled into a supramolecular assembly when illuminated at 470 nm. Scanning electron microscopy showed that the assembly formed a circular sheet structure. Self-assembly was also induced by light in E. coli. Dynamic light scattering and turbidity assay experiments showed that the assemblies formed within a few seconds under 470-nm light and completely disassembled within 5 min in the dark. Assembly and disassembly could be maintained for at least five cycles. Both in vitro and in vivo, the assemblies retained 90% of the initial activity of nitrilase and could be reused at least four times in vitro with 90% activity. Conclusions: An efficient method was developed for the photocontrolled assembly and disassembly of dodecamer nitrilase and for scaffold-free reversible self-assembly of multiple oligomeric enzymes in vivo and in vitro, providing new ideas and methods for immobilization of enzyme without carrier.
- Subjects
NITRILASES; ESCHERICHIA coli; PROTEIN-protein interactions; DIMERIZATION; CHIMERIC proteins; SCANNING electron microscopy
- Publication
Bioresources & Bioprocessing, 2017, Vol 4, Issue 1, p1
- ISSN
2197-4365
- Publication type
Article
- DOI
10.1186/s40643-017-0167-3