Geranylgeranyl Reductase Host Cells for Isoprenoid Hydrogenation

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Solution Overview

Problem

Existing methods for producing tailored isoprenoids and isoprenoid precursors in microbes are limited by the need for novel chemistries and biosynthetic pathways, particularly in reducing isoprenoid double bonds to enhance stability and reduce sensitivity to oxidation, which current enzymatic alkene hydrogenation methods struggle to achieve efficiently.

Innovation Solution

Genetically modified host cells expressing geranylgeranyl reductases (GGRs) with optimized amino acid sequences, capable of reducing isoprenoid pyrophosphates and alcohols, including geranyl pyrophosphate, farnesyl pyrophosphate, and geranylgeranyl pyrophosphate, to produce partially or fully saturated intermediates suitable for various industrial applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If enzymatic alkene hydrogenation is used to reduce isoprenoid double bonds, then stability and oxidation resistance are improved, but the process efficiency and substrate scope are limited due to reliance on adjacent electron withdrawing groups

Engineering Contradiction:

Improveisoprenoid stabilityVSAvoidreduction efficiency

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent changes the chemical parameters of the reduction process by using geranylgeranyl reductase enzymes that operate through a different mechanism (NADPH-dependent reduction) compared to conventional electron-withdrawing group assisted hydrogenation. This allows reduction of unactivated substrates like prenyml pyrophosphates without requiring specific electronic features, thereby improving both substrate scope and reaction efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces geranylgeranyl reductase enzymes as biological intermediaries that facilitate the reduction of isoprenoid substrates. These enzymes act as mediators between the reducing agent (NADPH) and the isoprenoid substrates, enabling efficient hydrogenation without requiring adjacent electron withdrawing groups, thus resolving the contradiction between stability improvement and production efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If geranylgeranyl reductases are used to reduce unactivated substrates like prenyml pyrophosphates, then substrate scope is improved, but enzyme availability and characterization are limited

Engineering Contradiction:

Improvesubstrate scopeVSAvoidenzyme availability

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent demonstrates that geranylgeranyl reductase enzymes possess universal activity across multiple substrate types including geranyl pyrophosphate, farnesyl pyrophosphate, and geranylgeranyl pyrophosphate. By identifying and characterizing these versatile enzymes from various sources, the patent makes a single enzyme system applicable to multiple isoprenoid substrates, improving ease of manufacture while maintaining broad substrate scope

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent identifies multiple geranylgeranyl reductase enzyme sequences from different organisms and uses these as templates or copies to develop functional enzyme systems. By copying successful enzyme designs from nature and optimizing them for industrial applications, the patent improves enzyme availability while maintaining the ability to reduce diverse unactivated substrates

Inventive Principle:

Principle #26Copying

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

The modified host cells effectively reduce isoprenoid substrates, enabling the production of high-value terpene-based products such as rubbers, biofuels, and pharmaceutical compounds, expanding the range of industrial applications and reducing production costs.

Implementation Method 1

Genetically modified host cells expressing geranylgeranyl reductases (GGRs) with optimized amino acid sequences, capable of reducing isoprenoid pyrophosphates and alcohols

Methodology Applied

Scientific EffectEnzymatic reduction: Enzyme

Implementation Method 2

reducing isoprenoid double bonds to decrease the reactivity and sensitivity to oxidation

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Data Source

PatentUS12365905B2Host cells and methods for reducing isoprenoid precursors and isoprenoids by geranylgeranyl reductase

Publication Date: 2025.07.22 RGT UNIV OF CALIFORNIA

AI summary

The present invention provides for a genetically modified host cell capable of reducing one or more isoprenoid, or precursor thereof, said genetically modified host cell comprising one or more geranylgeranyl reductases (GGRs), or polypeptides comprising an amino acid sequence having at least 70% identity to an amino acid sequence of a geranylgeranyl reductase (GGR), wherein the polypeptide comprises the enzymatic activity for catalyzing one or more GGR catalyzed reactions, and/or reducing one or more C15 or C20 prenyl alcohols or prenyl pyrophosphates.