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Related Concept Videos

Drug Classes and Categories01:25

Drug Classes and Categories

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Drugs can be classified according to their chemical composition or their intended therapeutic application. For instance, anti-infective agents that possess the ability to eliminate pathogens or suppress their growth and reproduction can be grouped based on the organisms they target or their chemical structure. Furthermore, drugs can be divided into prescription, nonprescription, or controlled substances. Prescription medications, such as antibiotics, require oversight from a licensed healthcare...
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Protein Glycosylation01:25

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Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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Related Experiment Video

Updated: Jun 11, 2025

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota
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Classifying compounds as prebiotics - scientific perspectives and recommendations.

Robert Hutkins1, Jens Walter2, Glenn R Gibson3

  • 1University of Nebraska, Lincoln, NE, USA.

Nature Reviews. Gastroenterology & Hepatology
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This summary is machine-generated.

Prebiotics selectively feed beneficial gut microbes, improving health. This expert recommendation clarifies criteria for classifying prebiotics and establishing their health benefits through microbiome modulation.

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Area of Science:

  • Microbiome research
  • Gut health and nutrition
  • Microbial ecology

Background:

  • The human microbiome plays a crucial role in health and disease.
  • Prebiotics, selectively utilized substrates, aim to modulate host microbial communities for health benefits.
  • Current challenges include establishing causality between prebiotic effects and health outcomes.

Purpose of the Study:

  • To provide a framework for classifying compounds as prebiotics.
  • To clarify the scientific principles and proper use of the term 'prebiotic'.
  • To propose methods for establishing causal links between microbiome modulation and host health.

Main Methods:

  • Discussion of ecological principles governing microbiome modulation by substrates.
  • Review of methodologies for characterizing microbiome changes.
  • Proposal of statistical approaches to link microbial and host health effects.

Main Results:

  • A framework for classifying prebiotics is presented.
  • Minimum criteria for classifying compounds as prebiotics are defined.
  • Methods to establish causality between prebiotic intervention and health outcomes are proposed.

Conclusions:

  • Clear criteria are needed to define and identify effective prebiotics.
  • Establishing causality requires rigorous scientific approaches linking microbiome changes to host health.
  • Standardized classification and communication are essential for consumer and regulatory understanding of prebiotics.