Journal of Microbiology

Journal Articles

Development of a Novel D‑Lactic Acid Production Platform Based on Lactobacillus saerimneri TBRC 5746: Kitisak Sansatchanon , Pipat Sudying , Peerada Promdonkoy , Yutthana Kingcha , Wonnop Visessanguan , Sutipa Tanapongpipat , Weerawat Runguphan , Kanokarn Kocharin; J. Microbiol. 2023;61(9):853-863. Published online September 14, 2023; DOI: https://doi.org/10.1007/s12275-023-00077-x

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D-Lactic acid is a chiral, three-carbon organic acid, that bolsters the thermostability of polylactic acid. In this study, we developed a microbial production platform for the high-titer production of D-lactic acid. We screened 600 isolates of lactic acid bacteria (LAB) and identified twelve strains that exclusively produced D-lactic acid in high titers. Of these strains, Lactobacillus saerimneri TBRC 5746 was selected for further development because of its homofermentative metabolism. We investigated the effects of high temperature and the use of cheap, renewable carbon sources on lactic acid production and observed a titer of 99.4 g/L and a yield of 0.90 g/g glucose (90% of the theoretical yield). However, we also observed L-lactic acid production, which reduced the product’s optical purity. We then used CRISPR/dCas9-assisted transcriptional repression to repress the two Lldh genes in the genome of L. saerimneri TBRC 5746, resulting in a 38% increase in D-lactic acid production and an improvement in optical purity. This is the first demonstration of CRISPR/dCas9-assisted transcriptional repression in this microbial host and represents progress toward efficient microbial production of D-lactic acid.

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Industrial–scale production of various bio–commodities by engineered microbial cell factories: Strategies of engineering in microbial robustness
Ju-Hyeong Jung, Vinoth Kumar Ponnusamy, Gopalakrishnan Kumar, Bartłomiej Igliński, Vinod Kumar, Grzegorz Piechota
Chemical Engineering Journal.2024; 502: 157679. CrossRef
Microbial Cell Factories: Biodiversity, Pathway Construction, Robustness, and Industrial Applicability
Rida Chaudhary, Ali Nawaz, Mireille Fouillaud, Laurent Dufossé, Ikram ul Haq, Hamid Mukhtar
Microbiology Research.2024; 15(1): 247. CrossRef
Adaptive Evolution for the Efficient Production of High-Quality d-Lactic Acid Using Engineered Klebsiella pneumoniae
Bo Jiang, Jiezheng Liu, Jingnan Wang, Guang Zhao, Zhe Zhao
Microorganisms.2024; 12(6): 1167. CrossRef
Enhancing D-lactic acid production from non-detoxified corn stover hydrolysate via innovative F127-IEA hydrogel-mediated immobilization of Lactobacillus bulgaricus T15
Yuhan Zheng, Feiyang Sun, Siyi Liu, Gang Wang, Huan Chen, Yongxin Guo, Xiufeng Wang, Maia Lia Escobar Bonora, Sitong Zhang, Yanli Li, Guang Chen
Frontiers in Microbiology.2024;[Epub] CrossRef

Proteome analysis reveals global response to deletion of mrflbA in Monascus ruber: Qingqing Yan , Zhouwei Zhang , Yishan Yang , Fusheng Chen , Yanchun Shao; J. Microbiol. 2018;56(4):255-263. Published online February 28, 2018; DOI: https://doi.org/10.1007/s12275-018-7425-8

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Abstract

Monascus spp. are commonly used for a wide variety of applications in the food and pharmaceutical industries. In previous studies, the knock-out of mrflbA (a putative regulator of the G protein α subunit) in M. ruber led to autolysis of the mycelia, decreased pigmentation and lowered mycotoxin production. Therefore, we aimed to obtain a comprehensive overview of the underlying mechanism of mrflbA deletion at the proteome level. A two-dimensional gel electrophoresis analysis of mycelial proteins indicated that the abundance of 178 proteins was altered in the ΔmrflbA strain, 33 of which were identified with high confidence. The identified proteins are involved in a range of activities, including carbohydrate and amino acid metabolism, hyphal development and the oxidative stress response, protein modification, and the regulation of cell signaling. Consistent with these findings, the activity of antioxidative enzymes and chitinase was elevated in the supernatant of the ΔmrflbA strain. Furthermore, deletion of mrflbA resulted in the transcriptional reduction of secondary metabolites (pigment and mycotoxin). In short, the mutant phenotypes induced by the deletion of mrflbA were consistent with changes in the expression levels of associated proteins, providing direct evidence of the regulatory functions mediated by mrflbA in M. ruber.

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Histone deacetylase MrHos3 negatively regulates the production of citrinin and pigments in Monascus ruber
Qianrui Liu, Yunfan Zheng, Baixue Liu, Fufang Tang, Yanchun Shao
Journal of Basic Microbiology.2023; 63(10): 1128. CrossRef
Histone deacetylase MrRpd3 plays a major regulational role in the mycotoxin production of Monascus ruber
Yunfan Zheng, Yueyan Huang, Zejing Mao, Yanchun Shao
Food Control.2022; 132: 108457. CrossRef
Characterization of key upstream asexual developmental regulators in Monascus ruber M7
Lili Jia, Yuyun Huang, Jae-Hyuk Yu, Marc Stadler, Yanchun Shao, Wanping Chen, Fusheng Chen
Food Bioscience.2022; 50: 102153. CrossRef
Quantitative Proteomics Analysis by Sequential Window Acquisition of All Theoretical Mass Spectra–Mass Spectrometry Reveals Inhibition Mechanism of Pigments and Citrinin Production of Monascus Response to High Ammonium Chloride Concentration
Bo Zhou, Yifan Ma, Yuan Tian, Jingbo Li, Haiyan Zhong
Journal of Agricultural and Food Chemistry.2020; 68(3): 808. CrossRef

Research Support, Non-U.S. Gov't

The Changes of Proteomes Components of Helicobacter pylori in Response to Acid Stress without Urea: Chunhong Shao , Qunye Zhang , Wei Tang , Wei Qu , Yabin Zhou , Yundong Sun , Han Yu , Jihui Jia; J. Microbiol. 2008;46(3):331-337. Published online July 5, 2008; DOI: https://doi.org/10.1007/s12275-008-0062-x

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Abstract: Acid stress is the most obvious challenge Helicobacter pylori encounters in human stomach. The urease system is the basic process used to maintain periplasmic and cytoplasmic pH near neutrality when H. pylori is exposed to acidic condition. However, since the urea concentration in gastric juice is approximately 1 mM, considered possibly insufficient to ensure the survival of H. pylori, it is postulated that additional mechanisms of pH homeostasis may contribute to the acid adaptation in H. pylori. In order to identify the acid-related proteins other than the urease system we have compared the proteome profiles of H. pylori strain 26695 exposed to different levels of external pH (7.4, 6.0, 5.0, 4.0, 3.0, and 2.0) for 30 min in the absence of urea using 2-DE. Differentially expressed proteins were identified by MALDI-TOF-TOF-MS analysis, which turned out to be 36 different proteins. The functions of these proteins included ammonia production, molecular chaperones, energy metabolism, cell envelope, response regulator and some proteins with unknown function. SOM analysis indicated that H. pylori responds to acid stress through multi-mechanisms involving many proteins, which depend on the levels of acidity the cells encounter.

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