Related Experiment Video

Updated: Aug 17, 2026

Visualization of the Charcoal Agar Resazurin Assay for Semi-quantitative, Medium-throughput Enumeration of Mycobacteria
09:57

Visualization of the Charcoal Agar Resazurin Assay for Semi-quantitative, Medium-throughput Enumeration of Mycobacteria

Published on: December 14, 2016

Effect of rifampicin on the heterocyst pattern in Anabaena ARM 314

I S Grover, S Puri

    Zeitschrift Fur Allgemeine Mikrobiologie
    |January 1, 1981
    PubMed

    Insights

    Rifampicin alters Anabaena ARM 314 heterocyst formation, creating paired or multiple heterocysts. This change is linked to unique protein patterns, suggesting modified enzyme activity in response to the antibiotic.

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Biochemistry

    Background:

    • Anabaena ARM 314, a cyanobacterium, typically forms heterocysts for nitrogen fixation.
    • Heterocyst differentiation is a complex process regulated by nitrogen availability and signaling molecules.
    • Antibiotics like rifampicin can interfere with cellular processes in microorganisms.

    Purpose of the Study:

    • To investigate the effect of rifampicin on heterocyst pattern formation in Anabaena ARM 314.
    • To analyze the protein expression changes associated with altered heterocyst differentiation.
    • To explore the potential mechanisms by which rifampicin influences heterocyst development.

    Main Methods:

    • Culturing Anabaena ARM 314 filaments in a nitrogen-depleted medium supplemented with rifampicin.
    • Microscopic observation of heterocyst patterns (single, paired, and multiple).
    • Electrophoretic analysis of protein profiles from non-heterocystous, heterocystous, and multiple heterocystous filaments.

    Main Results:

    • Rifampicin treatment induced alterations in heterocyst patterns, including paired and strings of 3-9 heterocysts.
    • Multiple heterocystous filaments exhibited two distinct additional protein bands compared to control filaments.
    • These protein changes suggest a molecular response to rifampicin-induced differentiation.

    Conclusions:

    • Rifampicin significantly alters heterocyst differentiation in Anabaena ARM 314, leading to unusual patterns.
    • The observed protein transients indicate a potential modification of enzyme systems involved in regulating heterocyst formation.
    • Rifampicin may affect enzymes synthesizing inhibitory substances or those involved in sequestering them, thereby influencing differentiation.

    More Related Videos

    Metabolic Profiling to Determine Bactericidal or Bacteriostatic Effects of New Natural Products using Isothermal Microcalorimetry07:28

    Metabolic Profiling to Determine Bactericidal or Bacteriostatic Effects of New Natural Products using Isothermal Microcalorimetry

    Published on: October 29, 2020

    Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System05:06

    Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System

    Published on: January 5, 2024

    Related Concept Videos

    Stringent Response in E. coli01:23

    Stringent Response in E. coli

    Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
    Production of Antibiotics01:27

    Production of Antibiotics

    Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
    Inhibitors of Bacterial Protein Synthesis01:25

    Inhibitors of Bacterial Protein Synthesis

    Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...