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A SsrA/NIa-based Strategy for Post-Translational Regulation of Protein Levels in Gram-negative Bacteria

Authors: Gonzalo Durante-Rodríguez, Belén Calles, Víctor de Lorenzo and Pablo I. Nikel, date: 07/20/2020, view: 1364, Q&A: 0

[Abstract] Strategies to control the levels of key enzymes of bacterial metabolism are commonly based on the manipulation of gene of interest within the target pathway. The development of new protocols towards the manipulation of biochemical processes is still a major challenge in the field of metabolic engineering. On this background, the FENIX (functional ...

Sulfatase Assay to Determine Influence of Plants on Microbial Activity in Soil

Authors: Anna Koprivova, Achim Schmalenberger and Stanislav Kopriva, date: 01/20/2020, view: 2598, Q&A: 0

[Abstract] Sulfatase activity is often used as a measure of the activity of soil microorganisms. It is thus a suitable tool to investigate the response of microbes to plants. Here we present a method to determine the influence of various Arabidopsis genotypes on the function of soil microbiota using the sulfatase as a quantitative measure. We grew ...

Steady-state and Flux-based Trehalose Estimation as an Indicator of Carbon Flow from Gluconeogenesis or Glycolysis

Authors: Ritu Gupta and Sunil Laxman, date: 01/05/2020, view: 2411, Q&A: 0

[Abstract] Trehalose (and glycogen) is a major storage carbohydrate in many cells, including S. cerevisiae. Typically, trehalose (a disaccharide of glucose) is synthesized and stored through gluconeogenesis. However, trehalose can also be made directly from glucose, if glucose-6-phosphate is channeled away from glycolysis or pentose phosphate ...

I Plate-based Assay for Studying How Fungal Volatile Compounds (VCs) Affect Plant Growth and Development and the Identification of VCs via SPME-GC-MS

Authors: Wenzhao Wang, Ningxiao Li, Xingzhong Liu and Seogchan Kang, date: 02/20/2019, view: 4395, Q&A: 0

[Abstract] Biogenic volatile compounds (VCs) mediate various types of crucial intra- and inter-species interactions in plants, animals, and microorganisms owing to their ability to travel through air, liquid, and porous soils. To study how VCs produced by Verticillium dahliae, a soilborne fungal pathogen, affect plant growth and development, we ...

Soluble and Solid Iron Reduction Assays with Desulfitobacterium hafniense

Authors: Lucrezia Comensoli, Julien Maillard, Wafa M. Kooli, Pilar Junier and Edith Joseph, date: 09/05/2018, view: 3587, Q&A: 0

[Abstract] There is a pressing need to develop sustainable and efficient methods to protect and stabilize iron objects. To develop a conservation-restoration method for corroded iron objects, this bio-protocol presents the steps to investigate reductive dissolution of ferric iron and biogenic production of stabilizing ferrous iron minerals in the strict ...

Enzymatic Activity Assay for Invertase in Synechocystis Cells

Authors: Xiaoming Tan, Kuo Song and Xuefeng Lu, date: 05/20/2018, view: 5028, Q&A: 0

[Abstract] Invertase can catalyze the hydrolysis of sucrose, and is widely distributed in cells of cyanobacteria and plants. Being responsible for the first step for sucrose metabolism, invertase plays important physiological roles and its enzymatic activity is frequently needed to be determined. All the methods for determination of the invertase activity ...

Quantification of Hydrogen Sulfide and Cysteine Excreted by Bacterial Cells

Authors: Sergey Korshunov and James A. Imlay, date: 05/20/2018, view: 4531, Q&A: 0

[Abstract] Bacteria release cysteine to moderate the size of their intracellular pools. They can also evolve hydrogen sulfide, either through dissimilatory reduction of oxidized forms of sulfur or through the deliberate or inadvertent degradation of intracellular cysteine. These processes can have important consequences upon microbial communities, because ...

Determination of Intracellular Osmolytes in Cyanobacterial Cells

Authors: Xiaoming Tan, Kuo Song, Cuncun Qiao and Xuefeng Lu, date: 04/20/2018, view: 3816, Q&A: 0

[Abstract] Most of the cyanobacteria accumulate osmolytes including sucrose, glucosylglycerol, in their cells in response to salt stress. Here we describe a protocol of our laboratory for extraction and quantification of cyanobacterial intracellular sucrose and glucosylglycerol. We have confirmed this protocol was applicable to at least four kinds of ...

Flow Cytometric Quantification of Fatty Acid Uptake by Mycobacterium tuberculosis in Macrophages

Authors: Evgeniya V. Nazarova, Maria Podinovskaia, David G. Russell and Brian C. VanderVen, date: 02/20/2018, view: 8255, Q&A: 0

[Abstract] Mycobacterium tuberculosis (Mtb) has evolved to assimilate fatty acids from its host. However, until recently, there was no reliable way to quantify fatty acid uptake by the bacteria during host cell infection. Here we describe a new method to quantify fatty acid uptake by intracellular bacilli. We infect macrophages with Mtb ...

Determination of Mn Concentrations in Synechocystis sp. PCC6803 Using ICP-MS

Authors: Fabian Brandenburg, Hanan Schoffman, Nir Keren and Marion Eisenhut, date: 12/05/2017, view: 5649, Q&A: 0

[Abstract] Manganese (Mn) is an essential micronutrient for all photoautotrophic organisms. Two distinct pools of Mn have been identified in the cyanobacterium Synechocystis sp. PCC 6803 (Synechocystis), with 80% of the Mn residing in the periplasm and 20% in cytoplasm and thylakoid lumen (Keren et al., 2002). In this protocol, we ...

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