A bacterial expression system revisited for the recombinant production of cystine-rich plant lipid transfer proteins.

Non-specific lipid transfer proteins (nsLTPs) are abundant and ubiquitous cystine-rich proteins that are capable, in vitro, of binding lipids and hydrophobic molecules. In view to probe the lipid binding properties of the wheat nsLTP1, mutant variants may represent a powerful tool. To this end, a synthetic gene, encoding a mature wheat nsLTP1 polypeptide, was designed to ensure high level expression in Escherichia coli. The bacterial expression host strain, a translational fusion strategy, and convenient cleavage and purification procedures were optimized to produce in standard fermentation conditions, a significant amount (15 mg/L final yield), of a soluble and correctly folded recombinant nsLTP1. This highly amenable expression system is helpful in order to investigate structure-activity relationships of plant nsLTP.