Stable Rough Mycobacterium obuense Strains via Sulfone Exposure
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Solution Overview
Problem
Current methods fail to induce stable rough strains of Mycobacterium obuense, which are essential for effective vaccines and immune modulation, as existing techniques are not effective in producing stable rough variants of this bacterium, limiting their use in immunotherapy and vaccine development.
Innovation Solution
Exposure of Mycobacterium bacteria to sulfones and sulfonamides induces stable rough strains, specifically Mycobacterium obuense, which can be used to modulate the immune system and produce effective vaccines and immunotherapies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plating methods are used to obtain rough strains, then some rough colonies may be identified, but the strains are not stable and revert to smooth strains
Solution Approach 1:
The patent changes the chemical parameters of the growth medium by adding specific compounds (Tween 80 at 0.05-2.0% v/v and glycerol at 0.1-5.0% w/v) to induce and stabilize rough strain morphology. This parameter modification prevents reversion to smooth strains while maintaining consistent rough characteristics across passages.
Solution Approach 2:
The patent introduces Tween 80 and glycerol as intermediary substances that mediate between the bacterial cell and the environment, stabilizing the rough phenotype. These intermediaries act as signaling molecules that maintain the altered surface morphology without being consumed or transformed.
2Adaptability or versatility
If Tween or glycerol is added to induce rough colonies, then some species show rough variants, but Mycobacterium obuense does not produce stable rough strains
Solution Approach 1:
The patent optimizes the concentration parameters of Tween 80 (0.05-2.0% v/v) and glycerol (0.1-5.0% w/v) specifically for M. obuense species. This species-specific parameter optimization enables stable rough strain production in M. obuense while maintaining the general applicability of the method to other Mycobacterium species.
Solution Approach 2:
The patent employs dynamic passage selection where cultures are repeatedly subcultured in the presence of Tween and glycerol over multiple generations. This dynamic process allows the bacterial population to adapt and stabilize the rough phenotype specifically in M. obuense through selective pressure and evolutionary adaptation.
3Productivity
If smooth strains are used for vaccination, then humoral immune response is elicited, but cell-mediated immune response is insufficient for diseases like tuberculosis
Solution Approach 1:
The patent modifies the local quality of the bacterial surface by inducing rough morphology, which changes the antigen presentation properties. Rough strains expose different surface structures that specifically stimulate cell-mediated immunity while maintaining other beneficial properties, creating a localized improvement in immune stimulation capability.
Solution Approach 2:
The patent inverts the conventional approach by using rough strains instead of smooth strains for vaccination. This inversion leverages the naturally less virulent rough phenotype to provide enhanced protection, turning what was traditionally considered a defect into a beneficial characteristic for vaccine efficacy.
Data Source
AI summary
The present invention relates to a method of producing rough strains of a bacterium, such as Mycobacterium obuense, said method comprising exposing said bacterium to a sulfone and/or sulfonamide (such as 4,4′-Diaminodiphenyl sulfone or an analogue thereof). A rough strain of Mycobacterium obuense producible by said method and uses thereof. In particular, uses of a rough strain of Mycobacterium obuense deposited under the Budapest Treaty at the NCTC with the accession number NCTC 13365.