fulltext.study @t Gmail

Engineering of an N-acetylneuraminic acid synthetic pathway in Escherichia coli

Paper ID Volume ID Publish Year Pages File Format Full-Text
31713 44832 2012 7 PDF Available
Title
Engineering of an N-acetylneuraminic acid synthetic pathway in Escherichia coli
Abstract

N-acetylneuraminic acid (NeuAc) has recently drawn much attention owing to its wide applications in many aspects. Besides extraction from natural materials, production of NeuAc was recently focused on enzymatic synthesis and whole-cell biocatalysis. In this study, we designed an artificial NeuAc biosynthetic pathway through intermediate N-acetylglucosamine 6-phosphate in Escherichia coli. In this pathway, N-acetylglucosamine 2-epimerase (slr1975) and glucosamine-6-phosphate acetyltransferase (GNA1) were heterologously introduced into E. coli from Synechocystis sp. PCC6803 and Saccharomyces cerevisiae EBY100, respectively. By derepressing the feedback inhibition of glucosamine-6-phosphate synthase, increasing the accumulation of N-acetylglucosamine and pyruvate, and blocking the catabolism of NeuAc, we were able to produce 1.62 g l−1 NeuAc in recombinant E. coli directly from glucose. The NeuAc yield reached 7.85 g l−1 in fed-batch fermentation. This process offered an efficient fermentative method to produce NeuAc in microorganisms using glucose as carbon source and can be optimized for further improvement.

► A NeuAc synthetic pathway from glucose was designed and constructed in E. coli. ► Through rational design and step by step analysis, the yield was improved significantly. ► Proved whole-cell catalysis can be converted to microbial fermentation process.

Keywords
N-acetylneuraminic acid; Escherichia coli; Metabolic engineering
First Page Preview
Engineering of an N-acetylneuraminic acid synthetic pathway in Escherichia coli
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Metabolic Engineering - Volume 14, Issue 6, November 2012, Pages 623–629
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us