Fermentation Selective Advantage via Nutrient Metabolism

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Solution Overview

Problem

Aerobic and microaerobic fermentation processes face challenges in oxygen transfer due to high viscosity, requiring expensive carbon sources and struggling with contamination control, especially from bacteriophages and native cells that outcompete transformed cells for nutrients.

Innovation Solution

A method involving a fermentation mixture with a fractionated grain endosperm fraction and genetically modified cells that can metabolize nitrogen-, phosphorus-, and sulfur-containing compounds, providing a selective advantage over native cells and reducing contamination, without the use of antibiotics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If traditional corn ethanol fermentation is used, then inexpensive sugars can be utilized, but oxygen transfer is insufficient due to high viscosity of the fermentation broth

Engineering Contradiction:

Improvecost of carbon sourceVSAvoidoxygen transfer efficiency

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The patent changes the chemical composition parameters of the fermentation medium by using fractionated grain (depleted in conventional nitrogen, phosphorus, and sulfur compounds) combined with alternative nitrogen sources like melamine. This parameter change modifies the broth's physical properties, specifically reducing viscosity to improve oxygen transfer while maintaining cost-effectiveness.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If selective growth inhibitors like antibiotics are added, then transformed cells gain selective advantage, but antibiotics are undesirable or infeasible and spontaneous resistance occurs

Engineering Contradiction:

Improveselective advantage for transformed cellsVSAvoidcontamination and resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent enables the fermentation system to self-select transformed cells through nutritional requirements rather than external inhibitors. The transformed cells are engineered to require specific alternative nutrients (melamine, phosphite, thiosulfate) that native contaminants cannot utilize, creating automatic selective pressure without antibiotics or growth inhibitors.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent introduces alternative nutrients (melamine, phosphite, thiosulfate) as intermediary substances that serve as selective markers. These compounds act as mediators between the transformed cells and the fermentation environment, providing selective advantage through metabolic capability rather than through inhibitory mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If conventional nitrogen-, phosphorus-, and sulfur-containing compounds are used, then native cells can metabolize them, but transformed cells cannot compete against native cell contamination

Engineering Contradiction:

Improveavailability of nutrientsVSAvoidcontamination control

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent inverts the traditional approach by depleting the medium of conventional nutrients that native cells require and instead providing alternative nutrients that only transformed cells can metabolize. This inversion creates selective pressure favoring transformed cells while preventing native cell growth, solving the contamination problem.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Improves oxygen transfer and reduces contamination, enabling more efficient and cost-effective production of chemicals by utilizing non-traditional nutrient sources, enhancing the robustness of fermentation processes.

Implementation Method 1

The transformed cell can metabolize the one or more compounds (i.e., use the one or more nitrogen-, phosphorous, and/or sulfur-containing compounds as a source of nitrogen, phosphorous, and/or sulfur, respectively)

Methodology Applied

Scientific EffectMetabolism: Fermentation

Data Source

PatentUS11674162B2Selective advantage in fermentation

Publication Date: 2023.06.13 GINKGO BIOWORKS INC

AI summary

Disclosed are transformed cells and related nucleotide and protein sequences, and fermentation compositions and methods, all of which are related to providing selective advantage in fermentation. For example, a selective advantage results from transformation of a cell with a nucleic acid that allows a transformed cell to metabolize one or more nitrogen-, phosphorous-, and/or sulfur-containing compounds that a native cell of the same species as the transformed cell cannot metabolize, and from fermentation of the transformed cell using one or more feedstocks, such as fractioned grain, which are depleted in or free of conventional nitrogen-, phosphorous-, and/or sulfur-containing compounds that a native cell of the same species as the transformed cell can metabolize. Also disclosed are methods for improved oxygen transfer in an aerobic or microaerobic fermentation.