Surface Display Technologies in Microbial Biocatalysis

Surface display in microbial biocatalysis harnesses the ability to localise enzymes or binding domains on the exterior of living cells, creating robust whole-cell catalysts that merge catalyst and support into a single entity. Genetic fusion of target proteins to native or engineered anchoring motifs—ranging from autotransporter β-barrels and ice-nucleation proteins to lipoprotein and outer-membrane scaffolds—permits stable enzyme immobilisation without the need for cell disruption or costly purification. This approach enables multienzyme assemblies on the cell surface, facilitating substrate channeling in biomass conversion, stereoselective synthesis and environmental remediation. Advances in anchor engineering, display vector design and host strain optimisation have improved loading density, catalytic turnover and operational stability under harsh process conditions. Quantitative assays such as split-GFP complementation and nanobody-based fluorescence detection now allow precise measurement of display efficiency and functional activity at single-cell resolution. With applications spanning lignocellulosic biofuel production, fine-chemical synthesis and green fluorination, surface display technologies continue to bridge the gap between biocatalytic performance and industrial feasibility.

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Surface Display Technologies in Microbial Biocatalysis publication trend

The graph below shows the total number of articles in surface display technologies in microbial biocatalysis across all publications each year (not limited to Nature Index journals).

Technical terms

Anchoring motif: A protein domain or scaffold that localises a passenger enzyme to the microbial cell surface.

Autotransporter: A Gram-negative secretion system comprising a β-barrel translocator that exports the fused passenger domain to the outer membrane.

Ice-nucleation protein (INP): A membrane-bound scaffold from Pseudomonas spp. used to display heterologous proteins on the outer surface of bacteria.

Split-GFP assembly: A fluorescence complementation technique in which non-fluorescent GFP fragments fused to anchor and passenger reassemble on surface display to emit signal.

Whole-cell catalyst: A live microbial cell engineered to present active enzymes on its surface, enabling direct application in biotransformations without enzyme purification.

References

1. Quantitative measurement of cell-surface displayed proteins based on split-GFP assembly. Microbial Cell Factories (2024).
2. A nanobody:GFP bacterial platform that enables functional enzyme display and easy quantification of display capacity. Microbial Cell Factories (2016).
3. Proof of concept for the simplified breakdown of cellulose by combining Pseudomonasputida strains with surface displayed thermophilic endocellulase, exocellulase and β-glucosidase. Microbial Cell Factories (2016).
4. Development of highly efficient whole-cell catalysts of cis-epoxysuccinic acid hydrolase by surface display. Bioresources and Bioprocessing (2022).
5. Whole-cell catalysis by surface display of fluorinase on Escherichia coli using N-terminal domain of ice nucleation protein. Microbial Cell Factories (2021).