Regulation of heterologous recombinant protein expression in methylotrophic and methanotrophic bacteria
First Claim
1. A methylotrophic or methanotrophic prokaryotic host cell comprising two copies, integrated into the chromosome of the host cell, of a polynucleotide sequence that encodes a cysteine metabolism repressor (cymR repressor) protein exhibiting repressor activity which is regulatable by addition of cumate, and further comprising a polynucleotide construct which comprises a constitutive promoter native to the host cell, wherein the promoter is fused to a cymR operator sequence which is operatively linked to at least one gene of interest, wherein a cymR repressor protein encoded by the polynucleotide sequence binds to the cymR operator sequence and wherein the addition of cumate upregulates expression of the at least one gene of interest.
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Abstract
Methylotrophic or methanotrophic bacteria such as Methylobacterium are transformed with a gene of interest, and expression of the gene is regulated by means of a cumate repressor protein and an operator sequence which is operatively linked to the gene of interest, and the addition of an external agent. Specifically, the cymR repressor and cmt operator from Pseudomonas putida may serve to regulate gene expression in methylotrophic or methanotrophic bacteria with the addition of cumate.
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12 Claims
- 1. A methylotrophic or methanotrophic prokaryotic host cell comprising two copies, integrated into the chromosome of the host cell, of a polynucleotide sequence that encodes a cysteine metabolism repressor (cymR repressor) protein exhibiting repressor activity which is regulatable by addition of cumate, and further comprising a polynucleotide construct which comprises a constitutive promoter native to the host cell, wherein the promoter is fused to a cymR operator sequence which is operatively linked to at least one gene of interest, wherein a cymR repressor protein encoded by the polynucleotide sequence binds to the cymR operator sequence and wherein the addition of cumate upregulates expression of the at least one gene of interest.
Specification