PHA Copolymer Production Using Class 2 PhaC for Low-Temperature Strength

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Solution Overview

Problem

Existing methods fail to produce polyhydroxyalkanoate copolymers with a high proportion of 3-hydroxyalkanoate monomer units having 8 or more carbon atoms, leading to inadequate mechanical properties in low-temperature environments.

Innovation Solution

A transformed microorganism is developed with an introduced exogenous gene encoding a Class 2 PhaC derived from Mycobacterium, Mycolicibacterium, or Nocardioides, which produces a polyhydroxyalkanoate copolymer containing a high proportion of 3-hydroxyalkanoate monomer units with 8 or more carbon atoms by culturing in the presence of a carbon source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If PHAs are produced using conventional methods with Class 2 PhaC from Pseudomonas, then medium-chain-length 3HA monomer units can be incorporated, but the proportion of 3-hydroxyalkanoate monomer units having 8 or more carbon atoms remains insufficient

Engineering Contradiction:

Improveproportion of medium-chain-length 3HA monomer unitsVSAvoidmechanical properties in low-temperature environments

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the source organism parameter from Pseudomonas to Mycobacterium/Mycolicibacterium/Nocardioides to obtain a Class 2 PhaC enzyme with different substrate specificity, enabling higher incorporation of medium-chain-length 3HA monomer units (8 or more carbon atoms) into the PHA copolymer

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses an exogenous gene encoding Class 2 PhaC as an intermediary element to transfer the capability of producing high proportions of medium-chain-length 3HA monomer units from actinomycetes to the host microorganism, thereby achieving the desired copolymer composition

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If PHAs with high proportion of medium-chain-length 3HA monomer units are produced, then mechanical properties in low-temperature environments improve, but the production method becomes more complex

Engineering Contradiction:

Improvemechanical properties in low-temperature environmentsVSAvoidcomplexity of transformed microorganism system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts only the essential exogenous gene encoding Class 2 PhaC from actinomycetes and introduces it into the host microorganism, separating the key functional element from the complex native system of the original organism while achieving the desired PHA copolymer production

Inventive Principle:

Principle #2Taking out (Extraction)

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 resulting PHA copolymer exhibits improved mechanical properties in low-temperature environments due to the high proportion of medium-chain-length 3-hydroxyalkanoate monomer units, enhancing its performance in such conditions.

Implementation Method 1

PhaCs of Class 2 have polymerization activity for 3-hydroxyalkanoates having 6 to 14 carbon atoms

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Implementation Method 2

Polyhydroxyalkanoates (hereinafter also referred to as PHAs) are polyesters that microorganisms accumulate as energy storage substances in their cells

Methodology Applied

Scientific EffectMicrobial accumulation:

Data Source

PatentUS20250361533A1Transformed microorganism and polyhydroxyalkanoate copolymer production method

Publication Date: 2025.11.27 KANEKA CORP

AI summary

A transformed microorganism having an ability to produce a polyhydroxyalkanoate copolymer containing 3-hydroxyalkanoate monomer units having 8 or more carbon atoms includes: an exogenous gene encoding a polyhydroxyalkanoate synthase having an amino acid sequence of any one of SEQ ID NOS: 1 to 4; or an exogenous gene encoding a protein that has an amino acid sequence having a sequence identity of at least 90% with the amino acid sequence of any one of SEQ ID NOS: 1 to 4 and that has polyhydroxyalkanoate synthase activity.