The hydroxylation of tyrosine is an important reaction in the biosynthesis of many natural products. The use of bacteria for this reaction has not been very successful due to either the over-oxidation to ortho-quinone when using tyrosinases from bacteria or plants, or the lack of the native cofactor, tetrahydrobiopterin (BH4), needed for the activity of tyrosine hydroxylases (TH). Here, we demonstrate that an Escherichia coli cofactor, tetrahydromonapterin (MH4), can be used as an alternative cofactor for TH in presence of the BH4 regeneration pathway, and tyrosine hydroxylation is performed without over-oxidation. We used this platform for biosynthesis of one of the most powerful antioxidants, hydroxytyrosol. An endogenous aromatic aldehyde oxidase was identified and knocked out to prevent formation of the side product, and this resulted in nearly exclusive production of hydroxytyrosol in engineered E. coli. Finally, hydroxytyrosol production from a simple sugar as a sole carbon source was demonstrated.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ymben.2012.08.002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Development of Chitosan-Polyacrylic Acid Complex Systems for Enhanced Oral Delivery of and Probiotics.
Drug Des Devel Ther
January 2025
Department of Pharmaceutical Sciences and Pharmaceutics, Faculty of Pharmacy, Applied Science Private University, Amman, 11937, Jordan.
Introduction: The beneficial effects of probiotics are encountered by their low viability in gastrointestinal conditions and their insufficient stability during manufacturing, throughut the gastrointestinal transit, and storage. Therefore, novel systems are highly required to improve probiotics delivery.
Methods: In this study, Lactobacillus gasseri (L), Bifidobacterium bifidum (B), and a combination of L+B were encapsulated in chitosan (CS)-polyacrylic acid (PAA) complex systems (CS-PAA).
Water used in post-harvest handling and processing operations is an important risk factor for microbiological cross-contamination of fruits, vegetables and herbs (FVH). Industrial data indicated that the fresh-cut FVH sector is characterised by process water at cooled temperature, operational cycles between 1 and 15 h, and product volumes between 700 and 3000 kg. Intervention strategies were based on water disinfection treatments mostly using chlorine-based disinfectants.
View Article and Find Full Text PDFIdentifying key blood markers for bacteremia in elderly patients: insights into bacterial pathogens.
Front Cell Infect Microbiol
January 2025
Department of Clinical Laboratory, Fuding Hospital, Fujian University of Traditional Chinese Medicine, Fuding, Fujian, China.
Background: This study aimed to assess the distribution of bacteremia pathogens in elderly patients, examine the impact of gender on pathogen distribution, and evaluate the predictive value of routine blood parameters for diagnosing bacteremia.
Methods: A retrospective analysis was conducted on 151 elderly patients (≥60 years old) admitted to Fuding Hospital, Fujian University of Traditional Chinese Medicine between October 2022 and June 2023. Comprehensive routine blood tests and blood cultures were performed.
Clinical evaluation of a multiplex droplet digital PCR for diagnosing suspected bloodstream infections: a prospective study.
Front Cell Infect Microbiol
January 2025
Department of Clinical Laboratory, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
Background: Though droplet digital PCR (ddPCR) has emerged as a promising tool for early pathogen detection in bloodstream infections (BSIs), more studies are needed to support its clinical application widely due to different ddPCR platforms with discrepant diagnostic performance. Additionally, there is still a lack of clinical data to reveal the association between pathogen loads detected by ddPCR and corresponding BSIs.
Methods: In this prospective study, 173 patients with suspected BSIs were enrolled.
Antibacterial Activity of Peruvian Species: A Comparative Study of the Antimicrobial Effects of Extracts From Three Different Species, , and , Against Human Pathogens.
Int J Microbiol
January 2025
Universidad Nacional de San Agustín, Arequipa 04000, Peru.
The growing problem of antibiotic resistance has driven the search for new sources of antimicrobial agents. Plants, particularly those from the Malvaceae family, have showed promising potential in this field. The present study is based on extracts, and the antimicrobial action was assessed using and as experimental bacterial strains.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!