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Çë¸÷λ°ïÖúѰÕÒÎÄÕÂEnhancement of L-phenylalanine production by engineered Escherichia coli using phased exponential L-tyrosine feeding combined with nitrogen source optimization µÄ³ö°æºÅºÍÊÕ¼ºÅ£¨5λÊý£©¡£Ð»Ð»£¡

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Enhancement of l-phenylalanine production by engineered Escherichia coli using phased exponential l-tyrosine feeding combined with nitrogen source optimization.
×÷Õß:Yuan, Peipei; Cao, Weijia; Wang, Zhen; Chen, Kequan; Li, Yan; Ouyang, Pingkai
Journal of bioscience and bioengineering
¾í:120 ÆÚ:1 Ò³:36-40
DOI:10.1016/j.jbiosc.2014.12.002
³ö°æÄê:2015-Jul (Epub 2014 Dec 29)
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Nitrogen source optimization combined with phased exponential l-tyrosine feeding was employed to enhance l-phenylalanine production by a tyrosine-auxotroph strain, Escherichia coli YP1617. The absence of (NH4)2SO4, the use of corn steep powder and yeast extract as composite organic nitrogen source were more suitable for cell growth and l-phenylalanine production. Moreover, the optimal initial l-tyrosine level was 0.3gL(-1) and exponential l-tyrosine feeding slightly improved l-phenylalanine production. Nerveless, l-phenylalanine production was greatly enhanced by a strategy of phased exponential l-tyrosine feeding, where exponential feeding was started at the set specific growth rate of 0.08, 0.05, and 0.02h(-1) after 12, 32, and 52h, respectively. Compared with exponential l-tyrosine feeding at the set specific growth rate of 0.08h(-1), the developed strategy obtained a 15.33% increase in l-phenylalanine production (l-phenylalanine of 56.20gL(-1)) and a 45.28% decrease in l-tyrosine supplementation.
Copyright 2014 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.
¹Ø¼ü´Ê
¹Ø¼ü´ÊÁбí:Engineered Escherichia coli; Fed-batch; Nitrogen source; l-Phenylalanine; l-Tyrosine feeding
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µØÖ·:State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 211816, People's Republic of China.
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ÎÄÏ×ÀàÐÍ:Journal Article
ÓïÖÖ:English
PubMed ID:25553973
NLM Ψһ ID:100888800
´´½¨ÈÕÆÚ: 05 Jun 2015         
µç×Ó³ö°æ:29 Dec 2014
¹ú¼Ò/µØÇø: Japan
ISSN:1347-4421
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·ÖÖ÷Ìâ×Ó¿â:Index Medicus
״̬:In-Data-Review



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