Methods for the production and secretion of modified peptides

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/62 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2594151

The invention relates to the production of heterologous polypeptides in a recombinant host cell. More specifically, it relates to the production and secretion of peptides, such as biologically active peptides, that are modified by one or more lantibiotic-synthesizing enzymes. Provided is a nucleic acid construct encoding a polypeptide comprising 1) a non-lantibiotic export signal that is recognized by a non-lantibiotic export system; 2) a lantibiotic leader peptide that is recognized by at least a lantibiotic dehydratase such as LanB and, C-terminally of said export signal and said leader peptide, 3) a peptide of interest containing one or more serine or threonine residue(s) which can be posttranslationally dehydrated by said dehydratase. Also provided is a method for producing a polypeptide in a host cell, comprising providing a host cell with a nucleic acid construct according to the invention and allowing expression and secretion of the encoded polypeptide by said host cell, wherein said host cell comprises at least a dehydratase capable of modifying said encoded polypeptide and a non-lantibiotic export system capable of secreting said modified polypeptide.

Cette invention concerne la production de polypeptides hétérologues dans une cellule hôte recombinante. Elle concerne plus particulièrement la production et la sécrétion de peptides, tels que des peptides biologiquement actifs modifiés par une ou plusieurs enzymes synthétisées par des lantibiotiques. L'invention concerne également une construction d'acides nucléiques codant un polypeptide, qui comprend: 1) un signal d'exportation reconnu par un système d'exportation non-lantibiotique; 2) un signal peptidique lantibiotique reconnu par au moins une déshydratase lantibiotique, telle que LanB, à l'extrémité C-terminale du signal d'exportation et du signal peptidique; 3) un peptide d'intérêt contenant un ou plusieurs résidu(s) de sérine ou de thréonine et pouvant être déshydraté après traduction par ladite déshydratase. L'invention concerne en outre un procédé de production d'un polypeptide dans une cellule hôte, qui consiste à fournir à une cellule hôte une construction d'acides nucléiques de l'invention, et à permettre l'expression et la sécrétion du polypeptide codé par ladite cellule hôte. La cellule hôte comprend au moins une déshydratase pouvant modifier le polypeptide codé et un système d'exportation non-lantibiotique pouvant sécréter le polypeptide modifié.

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