Bacterial Extracts
Bacterial Extracts - Related Videos
09:59
Community DNA Extraction from Bacterial Colonies
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner Traditional methods of analysis for microbial communities within soils have usually involved either cultural assays utilizing dilution and plating methodology on selective and differential media or direct count assays. Direct counts offer information about the total number of bacteria present, but give no information about the number or diversity of populations present...
03:32
Cell-Free Protein Expression Using a Bacterial Crude Cell Extract
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the use of a bacterial cell-free protein expression system based on Vibrio natriegens crude lysate to perform coupled in vitro transcription and translation. It highlights the preparation of a master mix with essential components and the step-by-step synthesis of functional proteins from a DNA template.
07:20
One-step Extraction and Zymographic Analysis of Bacterial Gelatinases
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2025
Proteinases are vital for bacterial pathogenesis, enabling invasion and immune evasion. Single-step extraction of cytoplasmic and membrane proteins of bacteria in their active form is harrowing. This video article demonstrates the extraction of whole cellular proteins of Leptospira for zymography analysis to detect and characterize gelatinases.
05:12
Extraction of Total DNA from Leaves for Detection of Bacterial Infection
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2026
Source: Chen, H., et al. Specific and Accurate Detection of the Citrus Greening Pathogen Candidatus liberibacter spp. Using Conventional PCR on Citrus Leaf Tissue Samples. J. Vis. Exp. (2018)This video demonstrates the extraction of total genomic DNA from citrus leaf tissue infected with a pathogenic bacterium. The protocol enables reliable DNA recovery for downstream PCR-based detection of the phloem-limited pathogen.
12:37
Efficient Nucleic Acid Extraction and 16S rRNA Gene Sequencing for Bacterial Community Characterization
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Cited by 42 •
2016
We describe an efficient, robust, and cost effective method for extracting nucleic acid from swabs for characterization of bacterial communities using 16S rRNA gene amplicon sequencing. The method allows for a common processing approach for multiple sample types and accommodates a number of downstream analytic processes.
FAQs
These approaches open bacterial cells through different disruption strategies, allowing intracellular proteins, nucleic acids, metabolites, and other components to enter the extract. Mechanical treatment physically breaks cells, whereas chemical or enzymatic treatment uses reagents or biological activities to achieve disruption. Selecting among these approaches gives researchers a way to prepare material suited to biochemical analysis or downstream use.
Clarification separates soluble material from cell debris after disruption, commonly through centrifugation. This step produces a less heterogeneous fraction containing released biochemical components while removing much of the insoluble cellular material. The clarified preparation can then support further fractionation or purification, making it more useful for examining protein function, enzyme activity, or other biochemical properties.
Bacterial extracts can be used to characterize physiology under different growth conditions because the recovered intracellular mixture reflects cellular biochemical content at the time of preparation. Comparing extracts from differing conditions can therefore support investigation of changes in enzyme activity, metabolic pathways, protein function, or gene expression. The approach links extract composition with the physiological state being studied.
A typical workflow begins by disrupting bacterial cells using a mechanical, chemical, or enzymatic method. The disrupted material is then clarified, such as by centrifugation, to separate soluble contents from cell debris. Researchers may subsequently fractionate or purify the resulting material before analyzing proteins, nucleic acids, metabolites, enzyme activity, or other biochemical features.
Because the preparations contain multiple intracellular biochemical components, they can function as complex reaction mixtures for studying enzyme activity and metabolic pathways. They also support investigations of protein function and gene expression. These applications allow researchers to examine biochemical processes within a cellularly derived context rather than relying only on isolated components.
Their applications extend from protein production and diagnostic assay development to antimicrobial research and characterization of bacterial physiology. In protein-focused work, extracts provide cellular material for examining or using biochemical products. In diagnostic and antimicrobial studies, they supply bacterial components relevant to assay development or investigation, while physiology studies compare biochemical behavior under different growth conditions.