Polyphenol Oxidase Modulation IV-IV-B

Camellia sinensis

Tea

Tier IVPolyphenol Oxidase Modulation

Target Trait

2.93×

fold-change

PPO activity-controlled oxidative astringency modulation index

Technical Specifications

SKU

SS-F-AST-512

Genomic Edits

GC Content

46.2%

Construct Length

3,888 bp

Promoter System

T7/SP6 cell-free

Expression System

In-vitro cell-free

Host Strain

Cell-free

Receptor Target

Polyphenol-astringency axis

IFI Score

293

Pathway Edits

PPO1-alt overexpression (activity-enhanced polyphenol oxidase allele) for controlled catechin oxidation
PPO2-RNAi silencing to suppress uncontrolled browning from PPO2 activity
LAC1 laccase upregulation for complementary catechin ortho-quinone formation
TDC co-expression (tryptophan decarboxylase) for auxiliary oxidative substrate channeling
Cell-free wheat germ extract reconstitution system
Enhanced flux via 5'UTR synthetic leader sequence optimization

Key Interventions

PPO1/PPO2 activity ratio control for precision-managed catechin oxidative couplingLAC1 laccase complementation for expanded oxidative astringency architecturePPO2-RNAi browning suppression for astringency enhancement without oxidative browning artifactsSP6/T7 dual-polymerase cell-free transcription/translationVariant B enhanced: iterative codon optimization for host-matched expression

IFI Subscale Profile

IFI Profile

IFI-S

—

IFI-U

—

IFI-B

—

IFI-K

—

IFI-C

—

IFI-P

—

IFI-A

293

IFI-F

—

Use Case

Industrial oxidative tea astringency ingredient production, premium black tea analog manufacturing, beverage processing R&D. Enhanced variant for premium or research-grade applications requiring peak astringency fidelity.

License

$4049 · Tier IV License

Includes full construct sequence, CRISPR guide designs, pathway edit specifications, flux balance analysis, and IFI validation data.

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