3-hydroxypropionic acid

Overview

3-hydroxypropionic acid (3-HP) is a small organic acid and an important bio-based platform chemical. In biotechnology, it is widely studied as an intermediate for the production of value-added chemicals, which is why it has attracted sustained interest in metabolic engineering and cell-free biosynthesis. In the research contexts provided here, 3-HP is treated primarily as a target product rather than as a therapeutic agent or disease biomarker.

Biologically, 3-HP is commonly investigated in engineered microbial systems because it can be synthesized from carbon sources such as glycerol or methanol through redesigned metabolic pathways. Enzymes such as glycerol dehydratase and α-ketoglutaric semialdehyde dehydrogenase, together with regulatory tools like CRISPR interference and inducible promoter systems, are used to improve flux toward 3-HP and to control its production dynamically.

Focus of Latest Publications

Recent studies have focused on improving 3-HP biosynthesis, transport, and process control in several microbial and cell-free platforms.

One study in Vibrio natriegens used a tunable transcription-level dCas9-based CRISPR interference (CRISPRi) system with engineered guide RNA designs to repress endogenous genes. This repression increased 3-HP production by 2.2-fold, while also increasing lycopene production by 1.5-fold, indicating that transcriptional tuning can redirect cellular resources toward multiple engineered products.

Another study developed a self-organized enzyme cascade for enhanced cell-free biosynthesis of 3-HP. The work framed 3-HP as a bio-based platform chemical and aimed to improve its synthesis outside living cells using an engineered cascade. The emphasis was on building an efficient enzymatic system for production rather than relying on whole-cell metabolism.

In Pichia pastoris, researchers created an anhydrotetracycline (aTc)-inducible metabolic flux adaptation platform for 3-HP production from sole methanol. This approach used an aTc inducible promoter toolkit to enable dynamic gene expression, allowing the yeast to adjust metabolic flux during production. The study highlights methanol as the sole carbon source and positions inducible control as a strategy for improving 3-HP output in a methylotrophic host.

A separate Escherichia coli study investigated 3-HP import rather than synthesis alone. Using a genome-wide overexpression library and related functional tests, the researchers identified genes involved in 3-HP uptake. They found that overexpression of candidate import-related genes enhanced 3-HP import, and deletion of these genes in producing strains increased 3-HP titers by up to 21% compared with the control strain. This suggests that limiting product reuptake or improving export-import balance can be an important determinant of final titers.

Across these studies, 3-HP was consistently treated as a target for strain engineering, pathway optimization, and process improvement. The work spans production from glycerol and methanol, cell-free enzymatic synthesis, transcriptional control, and transport engineering, reflecting the broad interest in making 3-HP a scalable industrial intermediate.

Key Publications

• Jun Tunable Transcription-Level CRISPR Interference in Vibrio natriegens Using Engineered Single Guide RNAs. (ACS synthetic biology, 2026, PMID 42190245): "Tunable repression of endogenous genes led to a 2.2-fold increase in 3-hydroxypropionic acid (3-HP) production and a 1.5-fold increase in lycopene production."
• Jun Engineering a self-organized enzyme cascade for enhanced cell-free biosynthesis of 3-hydroxypropionic acid. (Protein science : a publication of the Protein Society, 2026, PMID 42080289): "The bio-based platform chemical 3-hydroxypropionic acid (3-HP) has attracted considerable attention as a precursor for the production of various value-added chemicals, motivating extensive efforts to biosynthesize it using engineered microbial cell factories."
• May Anhydrotetracycline-Inducible Metabolic Flux Adaptation for 3-Hydroxypropionic Acid Production in Pichia pastoris. (ACS synthetic biology, 2026, PMID 42060910): "Here, we developed a versatile and high-efficiency inducible platform for the methylotrophic yeast Pichia pastoris, which enables dynamic gene expression for 3-hydroxypropionic acid (3-HP) production from sole methanol."
• May Genome-Scale Engineering Importing Property of Escherichia coli for Improving Production of 3-Hydroxypropionic Acid. (Microbial biotechnology, 2026, PMID 42050378): "functional tests confirmed that their overexpression enhanced 3-HP import while their deletion in producing strains increased 3-HP titers by up to 21% compared with the control strain."