Precisely regulated expression of deleterious genes
First Claim
1. An expression system comprising a lux regulatory circuit, said regulatory circuit further comprising a luxR gene and truncated luxI gene of Vibrio, operably linked to and capable of stringently regulating expression of a gene, a product of which said gene is deleterious to an Escherichia coil host cell in which said expression system and said gene are resident.
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Abstract
The invention relates to an expression vector system based on the regulation of bacterial luminescence (the lux gene system). The invention further relates to the construction of a precisely regulatable expression vector system which comprises a complete luxR gene in combination with an inactivated luxI gene. If the system is turned off, no significant transcription occurs of any cloned gene product when used in combination with the regulatory scheme of the invention as is demonstrated by using the bacteriophage λ lysis genes. The induction of transcription relies on the addition of exogenous autoinducer which is both inexpensive and easy-to-use and which is required in only minute amounts.
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Citations
15 Claims
- 1. An expression system comprising a lux regulatory circuit, said regulatory circuit further comprising a luxR gene and truncated luxI gene of Vibrio, operably linked to and capable of stringently regulating expression of a gene, a product of which said gene is deleterious to an Escherichia coil host cell in which said expression system and said gene are resident.
- 10. A vector comprising a lux regulatory circuit, said regulatory circuit further comprising a luxR gene and truncated luxI gene of Vibrio, operably linked to and capable of stringently regulating expression of a gene, a product of which said gene is deleterious to an Escherichia coli host cell in which said lux regulatory circuit and said gene are resident.
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14. A method for expression of a deleterious gene comprising:
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(a) constructing a vector which is comprised of a lux regulatory circuit, said regulatory circuit further comprising a luxR gene and truncated luxI gene of Vibrio, capable of being operably linked to and capable of stringently regulating expression of said deleterious gene; (b) operably linking said deleterious gene to said lux regulatory circuit; (c) inserting said vector containing said lux regulatory circuit operably linked to said deleterious gene into a suitable Escherichia coli host cell; (d) allowing multiplication and growth of said host cell to a suitable level; and
,(e) inducing expression of said deleterious gene by introduction of an exogenous inducer into the environment of said host cell. - View Dependent Claims (15)
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Specification