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Applied and Environmental Microbiology, December 2005, p. 8911-8919, Vol. 71, No. 12
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.12.8911-8919.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Heterologous Leaky Production of Transglutaminase in Lactococcus lactis Significantly Enhances the Growth Performance of the Host

Rui-Yan Fu, Jian Chen, and Yin Li*

The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Southern Yangtze University, Wuxi 214036, People's Republic of China

Received 29 March 2005/ Accepted 8 September 2005

This study describes a novel strategy to improve the growth performance of Lactococcus lactis by heterologous production of food-grade transglutaminase. The mtg gene from Streptoverticillium mobaraense that encodes the transglutaminase mature protein was cloned into a nisin-inducible expression vector and transformed into L. lactis subsp. cremoris NZ9000. The leaky expression of the mtg gene from the nisA promoter resulted in ammonia formation and carbon flux redistribution at the pyruvate branch. As a consequence, medium acidification was lessened and energy utilization was improved. This led to significantly higher biomass production under aerobic conditions and particularly under non-pH-controlled conditions (up to a 12-fold increase). The results presented here provide a novel way to enhance the growth yield of L. lactis, which is an important step for the purposes of producing proteins of commercial interest using L. lactis as a host.

* Corresponding author. Mailing address: School of Biotechnology, Southern Yangtze University, 170 Huihe Road, Wuxi 214036, People's Republic of China. Phone: 86 510 588 5727. Fax: 86 510 588 8301. E-mail: yinli{at}sytu.edu.cn.

Applied and Environmental Microbiology, December 2005, p. 8911-8919, Vol. 71, No. 12
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.12.8911-8919.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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