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Isopropyl β thiogalactopyranoside iptg

Manufactured by Carl Roth
Sourced in Germany

Isopropyl-β-thiogalactopyranoside (IPTG) is a synthetic chemical compound used as an inducer in gene expression systems. It is a structural analog of allolactose, the natural inducer of the lac operon in E. coli. IPTG binds to the lac repressor protein, causing it to dissociate from the operator region of the lac operon, thereby allowing transcription of the downstream genes to occur.

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4 protocols using isopropyl β thiogalactopyranoside iptg

1

Reagents and Cell Line Specifications

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All chemicals used for this study were obtained from the following sources: acetic acid from Carl Roth GmbH (Karlsruhe, Germany); sodium borohydride from Life Technologies, Inc. (Eggenstein, Germany); antibiotics and isopropyl-β-thiogalactopyranoside (IPTG) from Carl Roth GmbH (Karlsruhe, Germany), restriction enzymes from Thermo Fisher Scientific-Fermentas (Schwerte, Germany); the E. coli strain BL21 (DE3) from Invitrogen (Carlsbad, USA) and E. coli strain XL-1 from Stratagene (La Jolla, USA). Oligonucleotide synthesis was performed at BioTez Berlin Buch GmbH (Berlin, Germany). Nucleic acid sequencing was carried out at Eurofins MWG Operon (Ebersberg, Germany). HPLC grade methanol, chloroform, and water were from Fisher Scientific. 1,2-dipentadecanoyl-sn-glycero-3-phosphocholine (PC(15:0/15:0)) and 1,2-dipentadecanoyl-sn-glycero-3-phosphoethanolamine (PC(15:0/15:0)) from Avanti Polar Lipids (Alabaster, USA). All other reagents were from Sigma-Aldrich, unless otherwise stated. Human lung epithelial cells (A549) were purchased from ATCC and cultured according to the recommendations of the vendor.
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2

Procurement of Chemicals and Materials

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The chemicals used for the different experiments were obtained from the following sources: Phosphate buffered saline without calcium and magnesium (PBS) from PAN Biotech (Aidenbach, Germany); nitrocellulose blotting membrane from Serva Electrophoresis GmbH (Heidelberg, Germany); EDTA (Merck KG, Darmstadt, Germany), arachidonic acid (AA) and authentic HPLC standards of HETE-isomers (15S-HETE, 15S/R-HETE, 12S/R-HETE, 12S-HETE, 8S/R-HETE, 5S-HETE) from Cayman Chem (distributed by Biomol GmbH, Hamburg, Germany); acetic acid from Carl Roth GmbH (Karlsruhe, Germany); sodium borohydride from Life Technologies, Inc. (Eggenstein, Germany); isopropyl-β-thiogalactopyranoside (IPTG) from Carl Roth GmbH (Karlsruhe, Germany); restriction enzymes from ThermoFisher (Schwerte, Germany); the E. coli strain Rosetta2 DE3 pLysS from Novagen (Merck-Millipore, Darmstadt, Germany); HEK293 cells from the German Collection of Microorganisms and Cell Culture GmbH (DSMZ, Braunschweig, Germany). The Bac-to-Bac∗ baculovirus expression system was purchased from Invitrogen Life Technologies (ThermoFisher, Schwerte, Germany). Oligonucleotide synthesis was performed at BioTez Berlin Buch GmbH (Berlin, Germany). Nucleic acid sequencing was carried out at Eurofins MWG Operon (Ebersberg, Germany). HPLC grade methanol, acetonitrile, n-hexane, 2-propanol, and water were from Fisher Scientific (Waltham, MA, USA).
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3

Expression and Purification of HETE Enzymes

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The chemicals used for this study were obtained from the following sources: Arachidonic acid (AA) and authentic HPLC standards of HETE-isomers (15S-HETE, 15S/R-HETE, 12S/R-HETE, 12S-HETE, 5S/R-HETE, 5S-HETE) from Cayman Chem (distributed by Biomol GmbH, Hamburg, Germany); acetic acid from Carl Roth GmbH (Karlsruhe, Germany); sodium borohydride from Life Technologies, Inc (Eggenstein, Germany); isopropyl-β-thiogalactopyranoside (IPTG) from Carl Roth GmbH (Karlsruhe, Germany); restriction enzymes from ThermoFisher (Schwerte, Germany); the E. coli strain Rosetta2 DE3 pLysS from Novagen (Merck-Millipore, Darmstadt, Germany); HEK293 cells from the German Collection of Microorganisms and Cell Culture GmbH (DSMZ, Braunschweig, Germany). The Bac-to-Bac baculovirus expression system was purchased from Invitrogen Life Technologies (ThermoFisher, Schwerte, Germany). Oligonucleotide synthesis was performed at BioTez Berlin Buch GmbH (Berlin, Germany). Nucleic acid sequencing was carried out at Eurofins MWG Operon (Ebersberg, Germany). HPLC grade methanol, acetonitrile, n-hexane, 2-propanol and water were from Fisher Scientific (New Hampshire, United States).
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4

Oxylipidomic Measurements Utilization

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Chemicals used for this study were of following origin: Arachidonic acid (AA) and standards of 15-HETE, 12-HETE, 5-HETE, 12-HEPE, 15-HEPE, 14-HDHA, 17-HDHA, 13-HODE, 13-HOTrE) from Cayman Chem.; sodium borohydride from Life Technologies, Inc. (Eggenstein, Germany); restriction enzymes from ThermoFisher (Schwerte, Germany); isopropyl-β-thiogalactopyranoside (IPTG) from Carl Roth GmbH (Karlsruhe, Germany); E. coli (strain Rosetta2 DE3 pLysS) from Novagen (Merck-Millipore, Darmstadt, Germany). Oligonucleotide synthesis was carried out at BioTez Berlin Buch GmbH (Berlin, Germany). Nucleic acid sequencing was performed at Eurofins MWG Operon (Ebersberg, Germany). HPLC grade solvents and water were purchased from Fisher Scientific (New Hampshire, USA). The origin of other chemicals employed in this study is specified in the description of the methods. The following chemicals were used for oxylipidomic measurements: Deuterated standards (LTB4-d4, 20-HETE-d6, 15-HETE-d8, 13-HODE-d4, 14,15-DHET-d11, 9,10-DiHOME-d4, 12,13-EpOME-d4, 8,9-EET-d11, PGE2-d4; 10 ng/ml each) from Cayman Chem. (Ann Arbor, USA); acetonitrile, solvents from Merck (Darmstadt, Germany) and Fisher Scientific (Schwerte, Germany).
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