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Title 

Co-expression of two heterologous lactate dehydrogenases genes in Kluyveromyces marxianus for l-lactic acid production

 

Kluyveromyces marxianus에서 D형 젖산 생산을 위한 2종의 이형 lactate dehydrogenases 동시 발현

Authors 

J W LeeJ H InJ B ParkJ ShinJ H ParkBong Hyun SungJung Hoon SohnJ H SeoS R KimD H Kweon

Publisher 

Elsevier

Issue Date 

2017

Citation 

Journal of Biotechnology, vol. 241, no. 0, pp. 81-86

Keywords 

Co-expressionKluyveromyces marxianusLactate dehydrogenaseLactic acidOptimal pH

Abstract 

Lactic acid (LA) is a versatile compound used in the food, pharmaceutical, textile, leather, and chemical industries. Biological production of LA is possible by yeast strains expressing a bacterial gene encoding L-lactate dehydrogenase (LDH). Kluyveromyces marxianus is an emerging non-conventional yeast with various phenotypes of industrial interest. However, it has not been extensively studied for LA production. In this study, K. marxianus was engineered to express and co-express various heterologous LDH enzymes that were reported to have different pH optimums. Specifically, three LDH enzymes originating from Staphylococcus epidermidis (SeLDH; optimal at pH 5.6), Lactobacillus acidophilus (LaLDH; optimal at pH 5.3), and Bos taurus (BtLDH; optimal at pH 9.8) were functionally expressed individually and in combination in K. marxianus, and the resulting strains were compared in terms of LA production. A strain co-expressing SeLDH and LaLDH (KM5 La + SeLDH) produced 16.0 g/L LA, whereas the strains expressing those enzymes individually produced only 8.4 and 6.8 g/L, respectively. This co-expressing strain produced 24.0 g/L LA with a yield of 0.48 g/g glucose in the presence of CaCO3. Our results suggest that co-expression of LDH enzymes with different pH optimums provides sufficient LDH activity under dynamic intracellular pH conditions, leading to enhanced production of LA compared to individual expression of the LDH enzymes.

ISSN 

0168-1656

Link 

http://dx.doi.org/10.1016/j.jbiotec.2016.11.015

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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