Journal
BIOTECHNOLOGY AND BIOENGINEERING
Volume 119, Issue 7, Pages 1781-1791Publisher
WILEY
DOI: 10.1002/bit.28099
Keywords
Agrobacterium; ConA; lectin; lettuce; recombinant
Categories
Funding
- Japan Science and Technology Agency (JST) [JPMJTR20UD, JPMJCR17H2]
- Yakult Bio-Science Foundation
- Japan Agency for Medical Research and Development [21gm6010018h0004]
- Hitachi Global Foundation
- Tokyo Biochemical Research Foundation
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In this study, recombinant Concanavalin A (ConA) was successfully produced in lettuce using the Agrobacterium tumefaciens-mediated transient expression system. The recombinant ConA showed similar glycan-binding specificity and affinity to the native ConA. This study provides a new approach for the recombinant expression of ConA.
Concanavalin A (ConA), a mannose (Man)-specific leguminous lectin isolated from the jack bean (Canavalia ensiformis) seed extracts, was discovered over a century ago. Although ConA has been extensively applied in various life science research, recombinant mature ConA expression has not been fully established. Here, we aimed to produce recombinant ConA (rConA) in lettuce (Lactuca sativa) using an Agrobacterium tumefaciens-mediated transient expression system. rConA could be produced as a fully active form from soluble fractions of lettuce leaves and purified by affinity chromatography. From 12 g wet weight of lettuce leaves, 0.9 mg rConA could be purified. The glycan-binding properties of rConA were then compared with that of the native ConA isolated from jack bean using glycoconjugate microarray and frontal affinity chromatography. rConA demonstrated a glycan-binding specificity similar to nConA. Both molecules bound to N-glycans containing a terminal Man residue. Consistent with previous reports, terminal Man alpha 1-6Man was found to be an essential unit for the high-affinity binding of rConA and nConA, while bisecting GlcNAc diminished the binding of rConA and nConA to Man alpha 1-6Man-terminated N-glycans. These results demonstrate that the fully active rConA could be produced using the A. tumefaciens-mediated transient expression system and used as a recombinant substitute for nConA.
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