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Secretion of heterologous proteins into the culture supernatant in laboratory strains of E. coli is possible by utilizing a type I secretion system (T1SS). One prominent example for a T1SS is based on the hemolysin A toxin. With this system, heterologous protein secretion has already been achieved. However, no cultivations in a defined mineral medium and in stirred tank bioreactors have been described in literature up to now, hampering the broad applicability of the system. In this study, a mineral medium was developed for cultivation under defined conditions. With this medium, the full potential and advantage of a secretion system in E. coli (low secretion of host proteins, no contamination with proteins from complex media compounds) can now be exploited. Additionally, quantification of the protein amount in the supernatant was demonstrated by application of the Bradford assay. In this work, host cell behavior was described in small scale by online monitoring of the oxygen transfer rate (OTR). Scalability was demonstrated by stirred tank fermentation yielding 540 mg/L HlyA1 in the supernatant. This work enhances the applicability of a protein secretion system in E. coli and paves the way for an industrial application. This article is protected by copyright. All rights reserved.
This article was published in the following journal.
Name: Biotechnology progress
Late-onset type 1 diabetes can be difficult to identify. Measurement of endogenous insulin secretion using C-peptide provides a gold standard classification of diabetes type in longstanding diabetes t...
The lytic transglycosylases (LTs) are important enzymes that degrade peptidoglycan of the bacterial cell wall and affecting many biological functions. We present here that XC_0706 and XC_3001 were ann...
Type IV pilus (T4P)-like systems have been identified in almost every major phylum of prokaryotic life. They include the type IVa pilus (T4aP), type II secretion system (T2SS), type IVb pilus (T4bP), ...
E. coli of phylogenetic group B2 is responsible for many extraintestinal infections, posing a great threat to health. The relatively polymorphic nature of CRISPR in phylogenetically related E. coli st...
Aeromonas veronii is a gram-negative species abundant in aquatic environments that causes disease in humans as well as terrestrial and aquatic animals. In the current study, 41 publicly available A. v...
Recent experiments in the lab of Prof. WD Hardt revealed, that in mice, 24 h exposure to a high-fat diet results in a breakdown of colonization resistance against Salmonella typhimurium. M...
The sequence type 131 (ST131) is a predominant lineage among extraintestinal pathogenic Escherichia coli. It plays a major role in the worldwide dissemination of E. coli that produce exten...
In type 2 diabetic patients, abnormality in secretion or action of incretin(GLP-1, GIP) is observed. Although controversy still exists, the secretion of GLP-1 is thought to be reduced by 2...
The existing diarrhoeagenic Escherichia coli (E. coli) challenge model is already suitable for dietary interventions in its current form, targeted to impact on the immediate clinical sympt...
Although the existing diarrhoeagenic Escherichia coli (E. coli) challenge model is already suitable for dietary interventions in its current form, further characterization of the working-...
The mineral magnesium ammonium phosphate with the formula NH4MgPO4. It is associated with urea-splitting organisms in a high magnesium, high phosphate, alkaline environment. Accumulation of crystallized struvite is found in the urinary tract as struvite CALCULI and as scale on sewage system equipment and wastewater pipes.
Multiprotein transmembrane complexes in GRAM-NEGATIVE BACTERIA involved in either the secretion of effector proteins from the bacterial cytoplasm into host cells, or the secretion and assembly of flagellar components. The major component of the T3SSs is called the injectosome or needle complex.
Strains of ESCHERICHIA COLI that are a subgroup of SHIGA-TOXIGENIC ESCHERICHIA COLI. They cause non-bloody and bloody DIARRHEA; HEMOLYTIC UREMIC SYNDROME; and hemorrhagic COLITIS. An important member of this subgroup is ESCHERICHIA COLI O157-H7.
Gram-negative bacterial secretion systems which carry out the secretion of folded proteins.T2SSs secrete folded proteins from the PERIPLASMIC SPACE that have been exported there by SEC TRANSLOCASE or TAT SECRETION SYSTEMS, or they secrete folded proteins directly from the CYTOPLASM. The T2SSs have four substructures, an ATPase, an inner membrane platform, a pseudopilin, and secretin, an outer membrane complex which is a channel for secretion. (This bacterial secretin is not the same as the mammalian hormone also named SECRETIN.)
Secretion systems of GRAM-NEGATIVE BACTERIA (single membrane proteins or multiprotein complexes) that carry out secretion of proteins from the PERIPLASMIC SPACE to the EXTRACELLULAR SPACE via a beta-barrel transmembrane pore. There are several T5SS subtypes: T5aSS monomeric autotransporters, T5bSS two-partner secretions systems (TPSS), T5cSS trimeric autotransporters, T5dSS fused two-partner secretion systems, and T5eSS autotransporters with inverted domains.
Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism ...