scholarly journals Expression of soluble cloned porcine pepsinogen A in Escherichia coli

1996 ◽  
Vol 315 (2) ◽  
pp. 443-446 ◽  
Author(s):  
Takuji TANAKA ◽  
Rickey Y. YADA
Keyword(s):  
Escherichia Coli ◽  
Ion Exchange ◽  
Fusion Protein ◽  
Kinetic Parameters ◽  
Expression System ◽  
Milk Clotting ◽  
Ph Dependency ◽  
Pepsinogen A ◽  
Proteolytic Activities ◽  
Intrinsic Length

A system for the production of soluble porcine pepsinogen A (EC 3.4.23.1) was developed by fusing the pepsinogen and thioredoxin genes and then expressing the fused product (Trx-PG) in Escherichia coli. The expressed fusion protein was purified using a combination of ion-exchange and hydrophobic chromatography. Trypsin digestion of the fusion protein yielded pepsinogen which was one residue longer than the intrinsic length. Acidification of either the fusion protein or pepsinogen (tryptic digestion of Trx-PG) yielded recombinant pepsin A (r-pepsin). When compared with commercial porcine pepsin A, r-pepsin had similar milk-clotting and proteolytic activities, kinetic parameters and pH dependency. The above results indicate that an expression system was developed which yielded fully active soluble pepsin(ogen) from Escherichia coli.

scholarly journals Overproduction and Biochemical Characterization of the Chryseobacterium meningosepticum BlaB Metallo-β-Lactamase

2002 ◽  
Vol 46 (6) ◽  
pp. 1921-1927 ◽  
Author(s):  
Sandrine Vessillier ◽  
Jean-Denis Docquier ◽  
Sandrine Rival ◽  
Jean-Marie Frere ◽  
Moreno Galleni ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Ion Exchange ◽  
Kinetic Parameters ◽  
Culture Supernatant ◽  
Biochemical Characterization ◽  
Expression System ◽  
T7 Promoter ◽  
Hydrolysis Of

ABSTRACT The BlaB metallo-β-lactamase of Chryseobacterium meningosepticum CCUG4310 was overproduced in Escherichia coli by means of a T7 promoter-based expression system. The overproducing system, scaled up in a 15-liter fermentor, yielded approximately 10 mg of BlaB protein per liter, mostly released in the culture supernatant. The enzyme was purified by two ion-exchange chromatographic steps with an overall yield of 66%. Analysis of the kinetic parameters revealed efficient activities (k cat/Km ratios of >106 M−1 s−1) toward most penam and carbapenem compounds, with the exception of the 6-α-methoxypenam derivative temocillin and of biapenem, which were poorer substrates. Hydrolysis of cephalosporins was overall less efficient, with a remarkable variability that was largely due to variable affinities of the BlaB enzyme for different compounds. BlaB was also able to hydrolyze serine-β-lactamase inhibitors, including β-iodopenicillanate, sulbactam and, although less efficiently, tazobactam.

scholarly journals Expression in Escherichia coli of human ARHGAP6 gene and purification of His-tagged recombinant protein.

2003 ◽  
Vol 50 (1) ◽  
pp. 239-247 ◽  
Author(s):  
Anna-Maria Ochocka ◽  
Marzena Czyzewska ◽  
Tadeusz Pawełczyk
Keyword(s):  
Escherichia Coli ◽  
Fusion Protein ◽  
Rho Gtpase ◽  
Expression System ◽  
Cloning And Expression ◽  
Soluble Form ◽  
E Coli ◽  
Escherichia Coli Cells ◽  
Step Procedure ◽  
Shock Proteins

In this report we describe cloning and expression of human Rho GTPase activating protein (ARHGAP6) isoform 4 in Escherichia coli cells as a fusion protein with 6xHis. We cloned the ARHGAP6 cDNA into the bacterial expression vector pPROEX-1. Induction of the 6xHis-ARHGAP6 protein in BL21(DE3) and DH5alpha cells caused lysis of the cells irrespective of the kind of culture medium used. Successful expression of the fusion protein was obtained in the MC4100Deltaibp mutant strain lacking the small heat-shock proteins IbpA and IbpB. Reasonable yield was obtained when the cells were cultured in Terrific Broth + 1% glucose medium at 22 degrees C for 16 h. The optimal cell density for expression of soluble 6xHis-ARHGAP6 protein was at A(600) about 0.5. Under these conditions over 90% of the fusion protein was present in a soluble form. The 6xHis-ARHGAP6 protein was purified to near homogeneity by a two step procedure comprising chromatography on Ni-nitrilotriacetate and cation exchange columns. The expression system and purification procedure employed made it possible to obtain 1-2 mg of pure 6xHis-ARHGAP6 protein from 300 ml (1.5 g of cells) of E. coli culture.

Production and characterization of recombinant insulin-like growth factor-I (IGF-I) and potent analogues of IGF-I, with Gly or Arg substituted for Glu 3, following their expression in Escherichia coli as fusion proteins

1992 ◽  
Vol 8 (1) ◽  
pp. 29-41 ◽  
Author(s):  
R. King ◽  
J. R. E. Wells ◽  
P. Krieg ◽  
M. Snoswell ◽  
J. Brazier ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Growth Factor ◽  
Fusion Protein ◽  
Fusion Proteins ◽  
Expression System ◽  
Insulin Like Growth Factor ◽  
Factor I ◽  
Igf I ◽  
Igf Binding ◽  
Growth Factor I

ABSTRACT The development of an efficient expression system for insulin-like growth factor-I (IGF-I) in Escherichia coli as a fusion protein is described. The fusion protein consists of an N-terminal extension made up of the first 46 amino acids of methionyl porcine GH ([Met1]-pGH) followed by the dipeptide Val-Asn. The latter two residues provide a unique hydroxylamine-sensitive link between [Met1]-pGH(1-46) and the N-terminal Gly of IGF-I. Downstream processing of the fusion proteins involved isolation of inclusion bodies, cleavage at the Asn-Gly bond, refolding of the reduced IGF-I peptide and purification to homogeneity. This expression system was also used to produce two variants of IGF-I in which Glu3 was substituted by either Gly or Arg to give [Gly3]-IGF-I and [Arg3]-IGF-I respectively. Production of milligram quantities of IGF-I peptide was readily achieved. The purity of the IGF-I, [Gly3]-IGF-I and [Arg3]-IGF-I was established by high-performance liquid chromatography and N-terminal sequence analysis. [Gly3]-IGF-I and [Arg3]-IGF-I were more potent than IGF-I in biological assays measuring stimulation of protein synthesis and DNA synthesis or inhibition of protein breakdown in rat L6 myoblasts. Both analogues bound very poorly to bovine IGF-binding protein-2 and slightly less well than IGF-I to the type-1 receptor on rat L6 myoblasts. We conclude that reduced binding to IGF-binding proteins rather than increased receptor binding is the likely explanation for the greater biological potency of the analogues compared with IGF-I.

scholarly journals Sensitive Genetic Screen for Protease Activity Based on a Cyclic AMP Signaling Cascade in Escherichia coli

2000 ◽  
Vol 182 (24) ◽  
pp. 7060-7066 ◽  
Author(s):  
Nathalie Dautin ◽  
Gouzel Karimova ◽  
Agnes Ullmann ◽  
Daniel Ladant
Keyword(s):  
Escherichia Coli ◽  
Fusion Protein ◽  
Highly Active Antiretroviral Therapy ◽  
Genetic Test ◽  
Genetic System ◽  
Hiv Protease ◽  
E Coli ◽  
Highly Active ◽  
Proteolytic Activities

ABSTRACT We describe a genetic system that allows in vivo screening or selection of site-specific proteases and of their cognate-specific inhibitors in Escherichia coli. This genetic test is based on the specific proteolysis of a signaling enzyme, the adenylate cyclase (AC) of Bordetella pertussis. As a model system we used the human immunodeficiency virus (HIV) protease. When an HIV protease processing site, p5, was inserted in frame into the AC polypeptide, the resulting ACp5 protein retained enzymatic activity and, when expressed in an E. coli cya strain, restored the Cya+ phenotype. The HIV protease coexpressed in the same cells resulted in cleavage and inactivation of ACp5; the cells became Cya−. When the entire HIV protease, including its adjacent processing sites, was inserted into the AC polypeptide, the resulting AC-HIV-Pr fusion protein, expressed in E. coli cya, was autoproteolysed and inactivated: the cells displayed Cya−phenotype. In the presence of the protease inhibitor indinavir or saquinavir, AC-HIV-Pr autoproteolysis was inhibited and the AC activity of the fusion protein was preserved; the cells were Cya+. Protease variants resistant to particular inhibitors could be easily distinguished from the wild type, as the cells displayed a Cya− phenotype in the presence of these inhibitors. This genetic test could represent a powerful approach to screen for new proteolytic activities and for novel protease inhibitors. It could also be used to detect in patients undergoing highly active antiretroviral therapy the emergence of HIV variants harboring antiprotease-resistant proteases.

scholarly journals Cloning and expression of LTB in Escherichia coli and Bacillus subtilis

2013 ◽  
Vol 16 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Trang Thi Phuong Phan ◽  
Anh Le Tuan Nguyen ◽  
Hoang Duc Nguyen
Keyword(s):  
Escherichia Coli ◽  
Bacillus Subtilis ◽  
Fusion Protein ◽  
Expression System ◽  
Pharmaceutical Products ◽  
Cloning And Expression ◽  
Gene Encoding ◽  
E Coli ◽  
B Subunit ◽  
The Common

LTB is the B subunit of heat labile toxins (LT) in Escherichia coli ETEC. This subunit is non-toxic but has a high immune response. Therefore, LTB is considered a suitable antigen for partial vaccine against the diarrhea caused by E. coli ETEC. The most important component of partial vaccine is antigen protein. Nowadays, with the advancement of recombinant protein technology, these antigens are mainly produced by the common bacterial expression system as E. coli. However, the recombinant proteins produced by E. coli are often miscellaneous with enterotoxins, which should be removed from pharmaceutical products. Thus, the production of antigen proteins in other expression system without endotoxins like Bacillus subtilis is in attention. We conducted the experiments of cloning and expressing LTB using a novel pHT plasmid that allow the protein to be expressed in both of E. coli and B. subtilis. We were successful to generate plasmid pHT326 and express the gene encoding for the fusion protein of LTB and LysSN-6xHis-TEV in B. subtilis and E. coli. The binding of fusion protein on the columns that have affinity with His-tag was confirmed. This result is about to be applied for the development of partial vaccine aganst the diarrhea as well as the development of some diagnostic kits for ETEC in food or medical waste and kits to detect antibodies against LTB in animals.

scholarly journals Overexpression of Soluble Human Thymosin Alpha 1 in Escherichia coli

2005 ◽  
Vol 37 (2) ◽  
pp. 147-151 ◽  
Author(s):  
Pei-Fu Chen ◽  
Hong-Ying Zhang ◽  
Geng-Feng Fu ◽  
Gen-Xing Xu ◽  
Ya-Yi Hou
Keyword(s):  
Escherichia Coli ◽  
Fusion Protein ◽  
Expression System ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Soluble Form ◽  
Bacterial Proteins ◽  
Nickel Affinity Chromatography ◽  
Sds Page ◽  
Thymosin Alpha 1

Abstract Synthesized gene of human thymosin alpha 1 (Tα1) was inserted into pET-28a, pET-9c, pThioHis B, pGEX-2T or pBV222 and then inductively expressed in strains of Escherichia coli. Among the five expression systems, the BL21/pET-28a system provides the highest expression level of fusion protein in a soluble form, which is up to 70% of total expressed bacterial proteins as visualized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The resulting fusion protein purified through nickel affinity chromatography accounts for 2.53% of the wet bacterial pellet weight and reaches 94.5% purity by SDS-PAGE. These results indicate the potential of this expression system for high-throughput production of recombinant Tα1.

In vitro reconstitution of antimicrobial pathogen activity by expressed recombinant bovine lactoferrin N-terminal peptide in Escherichia coli

2007 ◽  
Vol 74 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Hongxia Luo ◽  
Shangwu Chen ◽  
Fazheng Ren ◽  
Huiyuan Guo ◽  
Shaohua Lin ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Fusion Protein ◽  
Expression System ◽  
Bovine Liver ◽  
Bovine Lactoferrin ◽  
Glutathione S Transferase ◽  
Recombinant Peptide ◽  
Exon 2 ◽  
Enzymatic Proteolysis

Recombinant bovine lactoferrin N-terminal polypeptide (rbLF-N) Escherichia coli expression system was constructed and the rbLF-N antimicrobial activity was displayed by enzymatic proteolysis in this study. A 162 bp 5′-terminal fragment of bovine lactoferrin (bLF) gene from bovine liver gDNA was amplified by PCR. The DNA fragment containing exon-2 of the bLF gene was cloned into the expression vector pGEX-4T1 and the glutathione-S-transferase–rbLF-N (GST-rbLF-N) fusion protein was obtained by over-expression in Esch. coli BL21(DE3). After thrombin/pepsin digestion, the rbLF-N was released from the fusion protein. The recombinant peptide was separated and identified by SDS-PAGE, HPLC and LC-MS/MS analysis. A very strong anti-food-born microbial pathogen activity of the rbLF-N peptides was displayed through bio- and kinetic-assays in vitro. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of the rbLF-N peptide for bacterial pathogens Staphylococcus aureus, Streptococcus mutans, Esch. coli and Klebsiella pneumoniae were 11·7, 11·7, 11·7, 23·4 μg and 23·4, 11·7, 11·7, 46·4 μg, respectively. This study created a new route for exploring lactoferrin peptide application in food science.

Expression of soluble Saccharomyces cerevisiae alcohol dehydrogenase in Escherichia coli applicable to oxido-reduction bioconversions

Biologia ◽  
2014 ◽  
Vol 69 (6) ◽  
Author(s):  
Pavol Utekal ◽  
Csaba Tóth ◽  
Anikó Illésová ◽  
Pavol Koiš ◽  
Lucia Bocánová ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Saccharomyces Cerevisiae ◽  
Alcohol Dehydrogenase ◽  
Kinetic Parameters ◽  
Expression System ◽  
Recombinant Yeast ◽  
Yeast Alcohol Dehydrogenase ◽  
Volatile Production ◽  
Alcohol Dehydrogenase 1 ◽  
Expression Strain

AbstractSix-carbon aldehydes and alcohols belong to flavours and fragrances with wide application in the food, feed, cosmetic, chemical and pharmaceutical sectors. In the present study, we prepared the expression system for production of recombinant yeast alcohol dehydrogenase 1 (YADH1) from Saccharomyces cerevisiae which is suitable also for catalysis of the interconversion of C-6 aldehydes and alcohols. We have demonstrated that an effective three-step strategy can overcome the insolubility problems during YADH1 production in Escherichia coli. We used trxB and gor deficient expression strain, decreased concentration of isopropyl β-D-1-thiogalactopyranoside and lowered temperature to 20°C during induction. Finally, kinetic parameters of recombinant YADH1 were determined and we concluded it is a promising enzyme also for the interconversion of C-6 alcohols/aldehydes in green note volatile production.

Optimization of the Heterologous Expression of Sesuvium portulacastrum Betaine Aldehyde Dehydrogenase in Escherichia coli

2013 ◽  
Vol 864-867 ◽  
pp. 221-224
Author(s):  
Cheng Long Yang ◽  
Rui Mei Li ◽  
Yang Zhou ◽  
Rui Jun Duan ◽  
Shao Ping Fu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Fusion Protein ◽  
Aldehyde Dehydrogenase ◽  
Induction Time ◽  
Expression System ◽  
Betaine Aldehyde Dehydrogenase ◽  
Sesuvium Portulacastrum ◽  
Betaine Aldehyde ◽  
Dehydrogenase Gene ◽  
Full Length Sequence

A full-length sequence coding for a betaine aldehyde dehydrogenase gene from S. portulacastrum was cloned into expression vector pGEX-4T-1, and named pGEX-4T-SpBADH. The GST-SpBADH fusion protein was expressed and the expression conditions were optimized. Through the research on optimization of expression the concentration of IPTG, concentration of bacterium, induction time and temperature and so on, the results showed, the expression of GST-SpBADH increased accompany with the induction time. The expression level of GST-SpBADH fusion protein reached the highest for 5 h cultured and for OD600 is about 0.6 at 37°C, 0.2 mmol/L IPTG can effectively induce the expression of GST-SpBADH in Escherichia coli expression system.

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