Protocols in Current Issue
    Identification of Intrinsic RNA Binding Specificity of Purified Proteins by in vitro RNA Immunoprecipitation (vitRIP)
    Authors:  Marisa Müller, Tamas Schauer and Peter B. Becker, date: 03/05/2021, view: 955, Q&A: 0

    RNA-protein interactions are often mediated by dedicated canonical RNA binding domains. However, interactions through non-canonical domains with unknown specificity are increasingly observed, raising the question how RNA targets are recognized. Knowledge of the intrinsic RNA binding specificity contributes to the understanding of target

    A Quantitative Assay to Measure Stress Granule Association of Proteins and Peptides in Semi-permeabilized Human Cells
    Authors:  Saskia Hutten and Dorothee Dormann, date: 12/20/2020, view: 1253, Q&A: 0

    Stress granules (SGs) are membrane-less organelles that form in the cytoplasm through phase separation, in response to diverse stressors. SGs contain translationally stalled mRNAs, proteins involved in translation, and various RNA-binding proteins (RBPs). Due to the high local concentration of aggregation-prone RBPs, SGs might act as condensation

    Native Co-immunoprecipitation Assay to Identify Interacting Partners of Chromatin-associated Proteins in Mammalian Cells
    Authors:  Afzal Husain, Nasim A. Begum, Maki Kobayashi and Tasuku Honjo, date: 12/05/2020, view: 1484, Q&A: 0

    Protein-protein interactions play key roles in nuclear processes including transcription, replication, DNA damage repair, and recombination. Co-immunoprecipitation (Co-IP) followed by western blot or mass spectrometry is an invaluable approach to identify protein-protein interactions. One of the challenges in the Co-IP of a protein localized to

    Combining Gel Retardation and Footprinting to Determine Protein-DNA Interactions of Specific and/or Less Stable Complexes
    Authors:  Meng-Lun Hsieh, Alice Boulanger, Leslie G. Knipling and Deborah M. Hinton, date: 12/05/2020, view: 707, Q&A: 0

    DNA footprinting is a classic technique to investigate protein-DNA interactions. However, traditional footprinting protocols can be unsuccessful or difficult to interpret if the binding of the protein to the DNA is weak, the protein has a fast off-rate, or if several different protein-DNA complexes are formed. Our protocol differs from traditional

    Optogenetic Tuning of Protein-protein Binding in Bilayers Using LOVTRAP
    Authors:  Doug Tischer and Orion D. Weiner, date: 09/05/2020, view: 2211, Q&A: 0
    [Abstract] Modern microscopy methods are powerful tools for studying live cell signaling and biochemical reactions, enabling us to observe when and where these reactions take place from the level of a cell down to single molecules. With microscopy, each cell or molecule can be observed both before and after a given perturbation, facilitating better inference ...
    Protocol for Peptide Synthesis on Spectrally Encoded Beads for MRBLE-pep Assays
    Authors:  Jamin B. Hein, Huy Q. Nguyen, Martha Cyert and Polly M. Fordyce, date: 07/05/2020, view: 1800, Q&A: 0
    [Abstract] Every living cell relies on signal transduction pathways comprised of protein-protein interactions (PPIs). In many cases, these PPIs are between a folded protein domain and a short linear motif (SLiM) within an unstructured region of a protein. As a result of this small interaction interface (3-10 amino acids), the affinities of SLiM-mediated ...
    Assessments of HLA-I Specificities of Anti-HLA-I Monoclonal Antibodies Using Solid Phase Bead Arrays
    Authors:  Anita J. Zaitouna, Daniel S. Ramon and Malini Raghavan, date: 06/20/2020, view: 1522, Q&A: 0
    [Abstract] Human leukocyte antigen class I (HLA-I) molecules are a group of structurally-related cell surface proteins with a high degree of variability within the population. While only up to six variants are expressed in an individual person, the whole population contains thousands of different variants. The ability to distinguish specific variants is ...
    Biochemical Pulldown of mRNAs and Long Noncoding RNAs from Cellular Lysates Coupled with Mass Spectrometry to Identify Protein Binding Partners
    Authors:  Anca F. Savulescu, Stoyan Stoychev, Sipho Mamputha and Musa M. Mhlanga, date: 06/05/2020, view: 2125, Q&A: 0
    [Abstract] RNA binding proteins (RBPs) interact with cellular mRNAs, controlling various steps throughout the lifetime of these transcripts, including transcription, cellular transport, subcellular localization, translation and degradation. In addition to binding mRNA transcripts, a growing number of RBPs are shown to bind long noncoding RNAs (lncRNAs), ...
    In vitro Assay for Bacterial Membrane Protein Integration into Proteoliposomes
    Authors:  Hanako Nishikawa, Masaru Sasaki and Ken-ichi Nishiyama, date: 05/20/2020, view: 1981, Q&A: 0
    [Abstract] It is important to experimentally determine how membrane proteins are integrated into biomembranes to unveil the roles of the integration factors, and to understand the functions and structures of membrane proteins. We have developed a reconstitution system for membrane protein integration in E. coli using purified factors, in which the ...
    Measurement of Protein-Protein Interactions through Microscale Thermophoresis (MST)
    Authors:  Magnez Romain, Bryan Thiroux, Morgane Tardy, Bruno Quesnel and Xavier Thuru, date: 04/05/2020, view: 2241, Q&A: 0
    [Abstract] The binding interactions of PD-1 and PD-L1 have been studied by surface plasmon resonance (SPR) and isothermal titration calorimetry (ITC) over the past few years, but these investigations resulted in controversy regarding the values of the dissociation constant (Kd) (Freeman et al., 2000). MST is a powerful new method for the ...

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