Metabolic Inactivation
Metabolic Inactivation - Related Videos
06:58
Methodology to Metabolically Inactivate Bacteria for Caenorhabditis elegans Research
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Cited by 14 •
2023
The food source for Caenorhabditis elegans in the lab is live Escherichia coli. Since bacteria are metabolically active, they present a confounding variable in metabolic and drug studies in C. elegans. A detailed protocol to metabolically inactivate bacteria using paraformaldehyde is described here.
01:58
X-inactivation
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2021
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results. Instead, in order to avoid this potential issue, female mammalian cells inactivate nearly all the genes in one of their X chromosomes during early embryonic development. In the nuclear envelope surrounding the cell nucleus, the inactivated X chromosome...
01:58
X-Inactivation
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2019
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results. Instead, in order to avoid this potential issue, female mammalian cells inactivate nearly all the genes in one of their X chromosomes during early embryonic development. In the nuclear envelope surrounding the cell nucleus, the inactivated X chromosome...
01:22
Activation and Inactivation of G Proteins
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2023
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
05:41
Metabolic Profile Analysis of Zebrafish Embryos
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Cited by 42 •
2013
Zebrafish represent a powerful vertebrate model that has been under-utilised for metabolic studies. Here we describe a rapid way to measure the in vivo metabolic profile of developing zebrafish that allows the comparison of different mitochondrial function parameters between genetically or pharmacologically manipulated embryos, thereby increasing the applicability of this organism.
FAQs
The two reaction phases contribute differently. Phase I uses oxidation or hydrolysis to alter a compound, whereas phase II attaches a glucuronide or sulfate group. Considering both stages helps explain why chemical modification can affect physiological activity in one step and improve water solubility and excretion in another.
Cytochrome P450 enzymes are important in the initial chemical modification of many active compounds. Their oxidative activity can change molecular structure before later handling by conjugation pathways, while hydrolytic reactions provide another phase I route. In biology and pharmacology, examining these enzyme-mediated changes helps explain altered compound persistence and effects.
Attaching groups such as glucuronide or sulfate changes how an organism handles a compound by increasing water solubility. This property supports movement toward excretion, so phase II activity can influence how long an active molecule remains available to exert physiological effects. The same principle applies to hormones, neurotransmitters, drugs, and potentially harmful chemicals.
Differences in enzyme activity can produce different outcomes from the same compound exposure. Faster or more extensive chemical modification may reduce physiological effects or promote removal, whereas lower activity may be associated with longer-lasting activity or altered toxicity. This variability is why metabolic inactivation matters when interpreting drug responses and chemical-exposure outcomes.
Comparing the two provides a way to distinguish structural alteration from increased water solubility and excretion-related handling. That distinction helps investigators connect a compound’s chemical fate with changes in duration of action, physiological effects, and toxicity across biological studies. It also clarifies how different enzyme pathways contribute to the final outcome.
It helps identify how enzyme activity may shorten a drug’s action or change its handling, while phase I and phase II reactions indicate chemical features associated with reduced activity, greater water solubility, or excretion. These insights support the design of safer therapeutic compounds and improve interpretation of chemical-exposure outcomes in toxicology.