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Subcellular targeting of human interleukin-10 in plants
Rima Menassa1, Wendy Kennette, Vi Nguyen
1Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, 1391 Sandford Street, London, Ont., Canada N5V 4T3.
Journal of Biotechnology
|May 8, 2004
Summary
Plants can produce recombinant proteins, but achieving high concentrations remains a challenge. This study found human interleukin-10 (IL-10) accumulates in chloroplasts with a His tag, but not mitochondria, with limited biological activity.
Area of Science:
- Plant biotechnology
- Molecular biology
- Protein expression
Background:
- Plants are effective systems for producing recombinant proteins.
- Economic feasibility requires high protein yields, which are often challenging to achieve.
- Targeting proteins to specific cellular compartments can influence accumulation.
Purpose of the Study:
- To investigate the accumulation of human interleukin-10 (IL-10) in plant chloroplasts and mitochondria.
- To determine the impact of subcellular targeting on protein yield and activity.
- To explore strategies for enhancing recombinant protein production in plants.
Main Methods:
- Genetic engineering of plant cells to express human IL-10.
- Targeting IL-10 to chloroplasts and mitochondria using specific signal peptides.
- Addition of a C-terminal 6x His tag to assess its effect on accumulation.
- Analysis of protein accumulation, integrity, and biological activity.
Main Results:
- Human IL-10 accumulated in chloroplasts only when a 6x His tag was added to the C-terminus.
- The His tag potentially protected IL-10 from degradation in chloroplasts.
- IL-10 did not accumulate in mitochondria.
- Chloroplast-derived IL-10 was primarily monomeric and exhibited limited biological activity in vitro.
Conclusions:
- Subcellular targeting and protein modification (His tag) are critical for achieving recombinant protein accumulation in plant cells.
- Chloroplasts show potential for IL-10 production, but further optimization is needed to improve activity.
- Mitochondrial targeting of IL-10 was unsuccessful in this study.