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Immobilon classico

Manufactured by Merck Group

Immobilon Classico is a lab equipment product manufactured by Merck Group. It is designed for the immobilization of biomolecules, such as proteins, enzymes, or antibodies, onto solid supports. The core function of Immobilon Classico is to facilitate the attachment and stabilization of these biomolecules for various analytical and research applications.

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5 protocols using immobilon classico

1

Whole Cell Lysate Preparation and Immunoblotting

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Radioimmunoprecipitation (RIPA) buffer supplemented with phenylmethane-sulfonylfluoride (PMSF) (Sigma), protease inhibitor (Sigma), and phosphatase inhibitor (Sigma) was used to make whole cell lysates as previously described28 . Protein concentrations were determined using a Micro BCA Protein Assay Kit (Thermo Fisher Scientific, Waltham, MA), and samples were loaded into sodium dodecyl sulfate polyacrylamide (SDS-PAGE) gels adjacent to the Precision Plus Protein Kaleidoscope molecular weight marker (Bio-Rad, Hercules, CA). Proteins were separated via electrophoresis and gels transferred to blotting membrane using Trans-Blot Turbo Transfer System (Bio-Rad) per manufacturer’s protocol. Antibodies were utilized per manufacturers’ instructions. Immunoblots were developed with Immobilon Classico or Crescendo Western HRP Substrate (EMD Millipore, Millipore Sigma, Burlington, MA). Blots were stripped with stripping solution (Bio-Rad) at 65 °C for 20 minutes and then re-probed with selected antibodies. Equal protein loading was confirmed using β-actin.
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2

Whole-Cell Lysate Isolation and Protein Analysis

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Whole-cell lysates were isolated using radioimmunoprecipitation (RIPA) buffer supplemented with protease inhibitor (Sigma), phosphatase inhibitor (Sigma), and phenylmethane-sulfonylfluoride (PMSF) (Sigma) as previously described (15 (link)). Protein concentrations were determined using a Micro BCA Protein Assay Kit (Thermo Fisher Scientific Inc.), and samples were separated by electrophoresis on sodium dodecyl sulfate polyacrylamide (SDS-PAGE) gels. The Precision Plus Protein Kaleidoscope molecular weight marker (Bio-Rad, Hercules, CA) was utilized to confirm expected size of target proteins. Gel transfer to blotting membrane was completed using Trans-Blot Turbo Transfer System (Bio-Rad) per manufacturer’s protocol. Antibodies were utilized according to the manufacturers’ recommendations. Immunoblots were developed with Immobilon Classico or Crescendo Western HRP Substrate (EMD Millipore, Millipore Sigma, Burlington, MA). Blots were stripped with stripping solution (Bio-Rad) at 65°C for 20 minutes and then re-probed with selected antibodies. Equal protein loading between samples was confirmed using β-actin as an internal control.
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3

SDS-PAGE and Immunoblotting of NNMT

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Cell lysates were prepared as previously described [Drabarek et al., 2012; (link)Dymkowska et al., 2014] (link). Proteins were separated by polyacrylamide gel electrophoresis (PAGE) under denaturing conditions in the presence of 0.1% sodium dodecyl sulphate (SDS, BioShop) [Laemmli, 1970] (link). After transferring to the PVDF membrane (Millipore) NNMT protein was detected with the use of a specific primary antibody (Santa Cruz Biotechnology, sc-376048); anti-rabbit and anti-mouse secondary antibodies conjugated with horseradish peroxidase (HRP) were obtained from Abcam. For HRP detection (Fusion FX, Vilber Lourmat) chemiluminescent substrate Immobilon Classico (Merck Millipore) was used. The optical density of bands corresponding to defined proteins was determined densitometrically with the BIO-1D software (Vilber Lourmat) and expressed in relation to β-actin used as a loading control (Sigma, A-3854).
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4

Western Blot Analysis of Cellular Proteins

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Cells were lysed with 1% NP-40 in PBS containing protease inhibitor cocktail (Sigma). After removal of nuclei by brief centrifugation, cytosolic fraction was collected and mixed with 4x Laemmli Sample Buffer (Bio-Rad). Proteins were separated in 10% Bis-Tris acrylamide gels, blotted on to nitrocellulose membrane (Bio-Rad), and detected by antibodies. Mouse monoclonal anti-Nef was described previously (Zheng et al., 2003 (link)). Horseradish peroxidase (HRP)-conjugated mouse monoclonal anti-FLAG, anti-HA antibodies, and anti-actin were purchased from Sigma; HRP-conjugated mouse monoclonal anti-GAPDH was purchased from Proteintech; rabbit polyclonal anti-CrkRS (CDK12) and anti-CDC2L5 (CDK13) were purchased from Novus; rabbit polyclonal anti-CycK was purchased from Abcam; HRP-conjugated anti-human, -rabbit, and -mouse immunoglobulin G secondary antibodies were purchased from Thermo Fisher. Immobilon Classico and Crescendo Western HRP Substrate was purchased from MilliporeSigma.
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5

Western Blot Analysis of Cellular Proteins

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Cells were lysed with 1% NP-40 in PBS containing protease inhibitor cocktail (Sigma). After removal of nuclei by brief centrifugation, cytosolic fraction was collected and mixed with 4x Laemmli Sample Buffer (Bio-Rad). Proteins were separated in 10% Bis-Tris acrylamide gels, blotted on to nitrocellulose membrane (Bio-Rad), and detected by antibodies. Mouse monoclonal anti-Nef was described previously (Zheng et al., 2003 (link)). Horseradish peroxidase (HRP)-conjugated mouse monoclonal anti-FLAG, anti-HA antibodies, and anti-actin were purchased from Sigma; HRP-conjugated mouse monoclonal anti-GAPDH was purchased from Proteintech; rabbit polyclonal anti-CrkRS (CDK12) and anti-CDC2L5 (CDK13) were purchased from Novus; rabbit polyclonal anti-CycK was purchased from Abcam; HRP-conjugated anti-human, -rabbit, and -mouse immunoglobulin G secondary antibodies were purchased from Thermo Fisher. Immobilon Classico and Crescendo Western HRP Substrate was purchased from MilliporeSigma.
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