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Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells

BACKGROUND: L-tryptophan is an important ingredient in medicines, especially in neuromedicines such as antidepressants. Many commercial processes employ various microorganisms with high tryptophan synthase activity to produce L-tryptophan from indole and L-serine, but these processes are very costly...

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Autores principales: Sadeghiyan-Rizi, Tahereh, Fooladi, Jamshid, Momhed Heravi, Majid, Sadrai, Sima
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Kowsar 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4217663/
https://www.ncbi.nlm.nih.gov/pubmed/25371801
http://dx.doi.org/10.5812/jjm.10589
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author Sadeghiyan-Rizi, Tahereh
Fooladi, Jamshid
Momhed Heravi, Majid
Sadrai, Sima
author_facet Sadeghiyan-Rizi, Tahereh
Fooladi, Jamshid
Momhed Heravi, Majid
Sadrai, Sima
author_sort Sadeghiyan-Rizi, Tahereh
collection PubMed
description BACKGROUND: L-tryptophan is an important ingredient in medicines, especially in neuromedicines such as antidepressants. Many commercial processes employ various microorganisms with high tryptophan synthase activity to produce L-tryptophan from indole and L-serine, but these processes are very costly due to the costs of precursors, especially L-serine. OBJECTIVES: For this reason, we studied the ability to use processed Iranian cane and beet molasses as L-serine sources for L-tryptophan production, which enables us to reach a cost-effective process. MATERIALS AND METHODS: Whole cells of Escherichia coli ATCC 11303 were induced for L-tryptophan synthase by addition of indole to the growth medium and bacterial cells harvested from the growth medium were used as biocatalysts in the production medium. Conditions of the production medium were optimized and Iranian cane and beet molasses were processed by solvent extraction with ethanol and n-butanol and used as L-serine sources of the production medium. Amount of L-tryptophan and theoretical yield of L-tryptophan production were determined by High Performance Liquid Chromatography and by a colorimetrical method on the basis of the remaining indole assay, respectively. RESULTS: L-tryptophan production increased by 15 folds, when indole was used as an inducer. L-tryptophan was produced from processed Iranian beet molasses in satisfactory amounts (0.53 mM) and no exogenous pyridoxal phosphate was required as a cofactor under our experimental conditions. CONCLUSIONS: The obtained results proved that Iranian beet molasses include significant amounts of L-serine that makes them a suitable substitution for L-serine. Findings of the present study give impetus to use of Iranian beet molasses for cost-effective L-Trp production in the amino acid industry.
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spelling pubmed-42176632014-11-04 Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells Sadeghiyan-Rizi, Tahereh Fooladi, Jamshid Momhed Heravi, Majid Sadrai, Sima Jundishapur J Microbiol Research Article BACKGROUND: L-tryptophan is an important ingredient in medicines, especially in neuromedicines such as antidepressants. Many commercial processes employ various microorganisms with high tryptophan synthase activity to produce L-tryptophan from indole and L-serine, but these processes are very costly due to the costs of precursors, especially L-serine. OBJECTIVES: For this reason, we studied the ability to use processed Iranian cane and beet molasses as L-serine sources for L-tryptophan production, which enables us to reach a cost-effective process. MATERIALS AND METHODS: Whole cells of Escherichia coli ATCC 11303 were induced for L-tryptophan synthase by addition of indole to the growth medium and bacterial cells harvested from the growth medium were used as biocatalysts in the production medium. Conditions of the production medium were optimized and Iranian cane and beet molasses were processed by solvent extraction with ethanol and n-butanol and used as L-serine sources of the production medium. Amount of L-tryptophan and theoretical yield of L-tryptophan production were determined by High Performance Liquid Chromatography and by a colorimetrical method on the basis of the remaining indole assay, respectively. RESULTS: L-tryptophan production increased by 15 folds, when indole was used as an inducer. L-tryptophan was produced from processed Iranian beet molasses in satisfactory amounts (0.53 mM) and no exogenous pyridoxal phosphate was required as a cofactor under our experimental conditions. CONCLUSIONS: The obtained results proved that Iranian beet molasses include significant amounts of L-serine that makes them a suitable substitution for L-serine. Findings of the present study give impetus to use of Iranian beet molasses for cost-effective L-Trp production in the amino acid industry. Kowsar 2014-06-01 2014-06 /pmc/articles/PMC4217663/ /pubmed/25371801 http://dx.doi.org/10.5812/jjm.10589 Text en Copyright © 2014, Ahvaz Jundishapur University of Medical Sciences; Published by Kowsar Corp. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Sadeghiyan-Rizi, Tahereh
Fooladi, Jamshid
Momhed Heravi, Majid
Sadrai, Sima
Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells
title Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells
title_full Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells
title_fullStr Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells
title_full_unstemmed Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells
title_short Optimization of L-Tryptophan Biosynthesis From L-Serine of Processed Iranian Beet and Cane Molasses and Indole by Induced Escherichia coli ATCC 11303 Cells
title_sort optimization of l-tryptophan biosynthesis from l-serine of processed iranian beet and cane molasses and indole by induced escherichia coli atcc 11303 cells
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4217663/
https://www.ncbi.nlm.nih.gov/pubmed/25371801
http://dx.doi.org/10.5812/jjm.10589
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