Microbiology

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    Protocols in Current Issue
    Activity-based Crosslinking to Identify Substrates of Thioredoxin-domain Proteins in Malaria Parasites
    Authors:  David W. Cobb, Grace S. Woods and Vasant Muralidharan, date: 02/20/2022, view: 1390, Q&A: 0
    [Abstract] Malaria remains a major public health issue, infecting nearly 220 million people every year. The spread of drug-resistant strains of Plasmodium falciparum around the world threatens the progress made against this disease. Therefore, identifying druggable and essential pathways in P. falciparum parasites remains a major area of ...
    Isolation of Mitochondria from Ustilago maydis Protoplasts
    [Abstract]

    Ustilago maydis, a basidiomycete that infects Zea mays, is one of the top ten fungal models for studying DNA repair, signal transduction pathways, and dimorphic transitions, among other processes. From a metabolic point of view, U. maydis lacks fermentative capacity, pointing to mitochondria as a key player in central metabolism. Oxidative

    ...
    An Assay to Determine NAD(P)H: Quinone Oxidoreductase Activity in Cell Extracts from Candida glabrata
    Authors:  Anamika Battu, Rajaram Purushotham and Rupinder Kaur, date: 11/05/2021, view: 1319, Q&A: 0
    [Abstract]

    Flavodoxin-like proteins (Fld-LPs) are an important constituent of the oxidative stress defense system in several organisms and highly conserved from bacteria to humans. These proteins possess NAD(P)H:quinone oxidoreductase activity and convert quinones to hydroquinones through two-electron reduction, using NAD(P)H and quinone as electron donor

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    In vitro Nitrate Reductase Activity Assay of Mycolicibacterium smegmatis Crude Extract
    Authors:  Wei Tan, Zhi-Hui Shao and Guo-Ping Zhao, date: 07/20/2021, view: 1753, Q&A: 0
    [Abstract]

    Nitrate is one of the major inorganic nitrogen sources for microorganisms. Many bacterial and archaeal lineages can express cytoplasmic assimilatory nitrate reductase (NAS), which catalyzes the rate-limiting reduction of nitrate to nitrite in the nitrate assimilation pathway. Here, we present a detailed protocol for measuring in vitro nitrate

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    In vitro Glutamylation Inhibition of Ubiquitin Modification and Phosphoribosyl-Ubiquitin Ligation Mediated by Legionella pneumophila Effectors
    Authors:  Alan G. Sulpizio, Marena E. Minelli and Yuxin Mao, date: 11/05/2020, view: 2057, Q&A: 0
    [Abstract]

    Glutamylation is a posttranslational modification where the amino group of a free glutamate amino acid is conjugated to the carboxyl group of a glutamate side chain within a target protein. SidJ is a Legionella kinase-like protein that has recently been identified to perform protein polyglutamylation of the Legionella SdeA Phosphoribosyl-Ubiquitin

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    A Sensitive Coupled Enzyme Assay for Measuring Kinase and ATPase Kinetics Using ADP-Specific Hexokinase
    Authors:  Ciaran R. McFarlane and James W. Murray, date: 05/05/2020, view: 4856, Q&A: 0
    [Abstract] Kinases and ATPases perform essential biological functions in metabolism and regulation. Activity of these enzymes is commonly measured by coupling ATP consumption to the synthesis of a detectable product. For most assay systems the ATP concentration during the reaction is unknown, compromising the precision of the assay.

    Using the ...
    Assessment of Metacaspase Activity in Phytoplankton
    Authors:  Dina Spungin and Ilana Berman-Frank, date: 08/20/2019, view: 3313, Q&A: 0
    [Abstract] Programmed cell death (PCD) is an irreversible, genetically-controlled form of cell suicide in which an endogenous biochemical pathway leads to morphological changes and ultimately, cellular demise. PCD is accompanied by de-novo protein synthesis of a family of proteases-"caspases" that are often used as a diagnostic marker of PCD. ...
    Kinetic Characterization of the Shigella Type Three Secretion System ATPase Spa47 Using α-32P ATP
    Authors:  Heather B. Case and Nicholas E. Dickenson, date: 11/05/2018, view: 4002, Q&A: 0
    [Abstract] ATPases represent a diverse class of enzymes that utilize ATP hydrolysis to support critical biological functions such as driving ion pumps, providing mechanical work, unfolding/folding proteins, and supporting otherwise thermodynamically unfavorable chemical reactions. We have recently shown that the Shigella protein Spa47 is an ATPase ...
    Detection of Catalase Activity by Polyacrylamide Gel Electrophoresis (PAGE) in Cell Extracts from Pseudomonas aeruginosa
    Authors:  Magdalena Pezzoni, Ramón A. Pizarro and Cristina S. Costa, date: 06/05/2018, view: 7571, Q&A: 0
    [Abstract] Bacteria in nature and as pathogens commonly face oxidative stress which causes damage to proteins, lipids and DNA. This damage is produced by the action of reactive oxygen species (ROS) such as hydrogen peroxide (H2O2), singlet oxygen, superoxide anion and hydroxyl radical. ROS are generated by antimicrobials, environmental ...
    In vitro Analysis of Ubiquitin-like Protein Modification in Archaea
    Authors:  Xian Fu, Zachary Adams and Julie A. Maupin-Furlow, date: 05/20/2018, view: 5412, Q&A: 0
    [Abstract] The ubiquitin-like (Ubl) protein is widely distributed in Archaea and involved in many cellular pathways. A well-established method to reconstitute archaeal Ubl protein conjugation in vitro is important to better understand the process of archaeal Ubl protein modification. This protocol describes the in vitro reconstitution of ...



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