Molecular Biology


    Protocols in Current Issue
    Dual Fluorescence Cytometry Assay to Assess Cellular Protein Levels
    Authors:  Ashley M Ngo, Ruofan Wang and Andreas S Puschnik, date: 04/20/2020, view: 981, Q&A: 0
    [Abstract] Expression levels of cellular proteins can be affected by various perturbations, such as genetic knockout of interactors, drug treatments or cell stress. To specifically measure the effects on protein levels post-synthesis under different experimental conditions, it is important to compensate for transcriptional and other upstream changes. Here, ...
    High-resolution and Deep Phylogenetic Reconstruction of Ancestral States from Large Transcriptomic Data Sets
    Authors:  Sumanth Kumar Mutte and Dolf Weijers, date: 03/20/2020, view: 886, Q&A: 0
    [Abstract] Phylogenetics is an important area of evolutionary biology that helps to understand the origin and divergence of genes, genomes and species. Building meaningful phylogenetic trees is needed for the accurate reconstruction of the past. To achieve a correct phylogenetic understanding of genes or proteins, reliable and robust methods are needed to ...
    Production, Purification and Characterization of Recombinant Biotinylated Phytochrome B for Extracellular Optogenetics
    Authors:  Maximilian Hörner, O. Sascha Yousefi, Wolfgang W. A. Schamel and Wilfried Weber, date: 03/05/2020, view: 826, Q&A: 0
    [Abstract] In the field of extracellular optogenetics, photoreceptors are applied outside of cells to obtain systems with a desired functionality. Among the diverse applied photoreceptors, phytochromes are the only ones that can be actively and reversibly switched between the active and inactive photostate by the illumination with cell-compatible red and ...
    Semi-quantitative Determination of Protein Expression Using Immunohistochemistry Staining and Analysis: An Integrated Protocol
    Authors:  Alexandra R Crowe and Wei Yue, date: 12/20/2019, view: 1953, Q&A: 0
    [Abstract] Semi-quantitative IHC is a powerful method for investigating protein expression and localization within tissues. The semi-quantitative immunohistochemistry (IHC) involves using software such as free software ImageJ Fiji to conduct deconvolution and downstream analysis. Currently, there is lack of an integrated protocol that includes a detailed ...
    Analyzing the Functionality of Non-native Hsp70 Proteins in Saccharomyces cerevisiae
    Authors:  Laura E. Knighton, Lizbeth P. Saa, Adam M. Reitzel and Andrew W. Truman, date: 10/05/2019, view: 1206, Q&A: 0
    [Abstract] Yeast are an ideal system to study Heat Shock Protein 70 (Hsp70) function in a cellular context. This protocol was generated to analyze the function of non-native Hsp70 proteins by expressing them as the sole cytosolic Hsp70 in yeast. As an initial step, Hsp70 variants (such as Ssa1 point mutants and non-yeast versions such as Nematostella ...
    A PhoA-STII Based Method for Efficient Extracellular Secretion and Purification of Fab from Escherichia coli
    Authors:  Ziyan Wang, Yang Gao, Manyu Luo, Cedric Cagliero, Hua Jiang, Yueqing Xie, Jianwei Zhu and Huili Lu, date: 09/20/2019, view: 1819, Q&A: 0
    [Abstract] In comparison with full-length IgGs, antigen binding fragments (Fabs) are smaller in size and do not require the complexed post-translational modification. Therefore, Fab can be cost-effectively produced using an Escherichia coli (E. coli) expression system. However, the disulfide-bonds containing exogenous protein, including ...
    Imaging Gene Expression Dynamics in Pseudomonas fluorescens In5 during Interactions with the Fungus Fusarium graminearum PH-1
    Authors:  Rosanna C. Hennessy, Peter Stougaard and Stefan Olsson, date: 06/20/2019, view: 1790, Q&A: 0
    [Abstract] Genomics, transcriptomics and metabolomics are powerful technologies for studying microbial interactions. The main drawback of these methods is the requirement for destructive sampling. We have established an alternative but complementary technique based on a microplate system combined with promoter fusions for visualizing gene expression in space ...
    Production and Purification of Dengue Virus-like Particles from COS-1 Cells
    Authors:  Jedhan Ucat Galula, Gwong-Jen J. Chang and Day-Yu Chao, date: 06/20/2019, view: 2998, Q&A: 0
    [Abstract] Non-infectious virus-like particles (VLPs) containing dengue virus (DENV) pre-membrane (prM) and envelope (E) proteins have been demonstrated to be highly immunogenic and can be used as a potential vaccine candidate as well as a tool for serodiagnostic assays. Successful application of VLPs requires abundant, and high-purity production methods. ...
    Preparation and Purification of Proteins Secreted from Phytophthora sojae
    Authors:  Yeqiang Xia, Yan Wang and Yuanchao Wang, date: 10/20/2018, view: 2825, Q&A: 1
    [Abstract] Phytophthora sojae, the causal agent of soybean root and stem rot, is responsible for enormous economic losses in soybean production. P. sojae secrets various effectors to reprogram host immunity. The plant apoplastic space is a major battleground in plant-pathogen interactions. Here we describe a protocol for purification and ...
    Common Carotid Arteries Occlusion Surgery in Adult Rats as a Model of Chronic Cerebral Hypoperfusion
    Authors:  Dandan Cao, Yunfei Bai and Liang Li, date: 01/20/2018, view: 6453, Q&A: 0
    [Abstract] Chronic cerebral hypoperfusion (CCH) is an important risk factor of vascular dementia (VaD) and Alzheimer’s disease (AD). Hypoxia/ischemia in the whole brain induced by CCH causes serious damage to brain structure and function, which can lead to cognitive impairment. Two-vessel occlusion (2-VO), also known as permanent, bilateral common carotid ...

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