Isolation of 5-DSW with Protease Activity from Deep-Sea Mineral Water and Preparation of Functional Active Peptide Fractions from Chia Seeds.

In this study, we successfully isolated strains with high protease activity from deep-sea mineral water in Korea and used them to obtain functional peptide fractions from chia seeds. The obtained strains showed a high similarity of 99% with with a long rod type (named 5-DSW) and high protease activity at 40 °C, and 70% of the activity remained even at 70 °C. The defatted chia seed protein (15-50 kDa) was treated with crude protease from 5-DSW and digested into small peptides below 20 kDa.

Discrimination of from Other Species Using Specific Oligonucleotide Primers for the Pyruvate Carboxylase and Shikimate Dehydrogenase Genes.

is a useful bacterium in the food industry with applications as a starter strain for fermented food and as a probiotic. However, it is difficult to discriminate from other species because of high phenotypic and genetic similarity. In this study, we employed five previously constructed multilocus sequence typing (MLST) methods for the discrimination of from other species and all five MLST assays clearly distinguished .

Engineered Escherichia coli strains as platforms for biological production of isoprene.

Volatile compounds can be produced by fermentation from genetically engineered microorganisms. Escherichia coli strains are mainly used for isoprene production owing to their higher titers; however, this has thus far been confined to only strains BL21, BL21 (DE3), Rosetta, and BW25113. Here, we tested four groups of E.

Development of novel on-line capillary gas chromatography-based analysis method for volatile organic compounds produced by aerobic fermentation.

Many volatile compounds, such as isoprene, a precursor used in the synthesis of natural rubber, have been produced through fermentation using genetically engineered microorganisms. Despite this biotechnological success, measuring the concentrations of volatile compounds during fermentation is difficult because of their high volatility. In current systems, off-line analytical methods usually lead to product loss, whereas on-line methods raise the production cost due to the requirement of complex devices.

Enhancement of -Threonine Production by Controlling Sequential Carbon-Nitrogen Ratios during Fermentation.

Controlling the residual glucose concentration is important for improving productivity in L-threonine fermentation. In this study, we developed a procedure to automatically control the feeding quantity of glucose solution as a function of ammonia-water consumption rate. The feeding ratio (R) of glucose and ammonia water was predetermined via a stoichiometric approach, on the basis of glucose-ammonia water consumption rates.

Soluble expression of OmpA from Haemophilus parasuis in Escherichia coli and its protective effects in the mouse model of infection.

Haemophilus parasuis causes contagious porcine Glässer's disease leading to severe losses in the swine industry. In this study, we established an efficient Escherichia colibased system for the expression of H. parasuis major outer-membrane protein (MOMP) that has been known as a good vaccine candidate against Glässer's disease.

Suppression of proinflammatory cytokine production by specific metabolites of Lactobacillus plantarum 10hk2 via inhibiting NF-κB and p38 MAPK expressions.

The objective of this study was to evaluate the immunomodulatory effects of specific bacterial metabolites of Lactobacillus plantarum 10hk2 to induce anti-inflammatory mediators in cell cultures of the murine macrophage cell line, RAW 264.7. The effects of the extracellular metabolites of this bacterial strain were examined by dividing them into protein and polysaccharide fractions.

Phosphate-responsive promoter of a Pichia pastoris sodium phosphate symporter.

To develop a functional phosphate-regulated promoter in Pichia pastoris, a phosphate-responsive gene, PHO89, which encodes a putative sodium (Na(+))-coupled phosphate symporter, was isolated. Sequencing analyses revealed a 1,731-bp open reading frame encoding a 576-amino-acid polypeptide with 12 putative transmembrane domains. The properties of the PHO89 promoter (P(PHO89)) were investigated using a bacterial lipase gene as a reporter in 5-liter jar fermentation experiments.

Translation elongation factor 1-alpha gene from Pichia pastoris: molecular cloning, sequence, and use of its promoter.

The gene encoding translation elongation factor 1-alpha from the yeast Pichia pastoris was cloned. The gene revealed an open reading frame of 1,380 bp with the potential to encode a polypeptide of 459 amino acids with a calculated mass of 50.1 kDa.