Fractional Occupancy
Fractional Occupancy - Related Videos
10:22
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Human microRNAs translocate from host erythrocytes to Plasmodium falciparum parasites. Here, the techniques used to transfect synthetic microRNAs into host erythrocytes and isolate all RNAs from P. falciparum are described. In addition, this paper will detail a method of polysome isolation in P. falciparum to determine the ribosomal occupancy and translational potential of parasite transcripts.
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Position a human participant’s head within the head coil of a functional magnetic resonance imaging, or fMRI, system.Employ vascular space occupancy or VASO, a technique to measure changes in cerebral blood volume, or CBV, the blood volume within the brain.Begin by applying an inversion recovery pulse to suppress signals from blood, allowing only signals from the surrounding tissue within the region to be detected.Next, use MRI-compatible earbuds to deliver auditory stimuli.The stimuli reach...
12:02
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10:09
Fractional Distillation
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Source: Laboratory of Dr. Nicholas Leadbeater — University of Connecticut Distillation is perhaps the most common laboratory technique employed by chemists for the purification of organic liquids. Compounds in a mixture with different boiling points separate into individual components when the mixture is carefully distilled. The two main types of distillation are "simple distillation" and "fractional distillation", and both are widely used in organic chemistry laboratories. Simple distillation...
07:57
Using the GELFREE 8100 Fractionation System for Molecular Weight-Based Fractionation with Liquid Phase Recovery
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Cited by 17 •
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The accompanying video describes the use of the GELFREE 8100 Fractionation System, which partitions complex protein samples on the basis of molecular weight and recovers the fractions in liquid phase. The video describes how the technology works, how it is used, and provides resultant data, with polyacrylamide gel electrophoresis analysis of fractionated bovine liver homogenate.
FAQs
Kd provides a reference for interpreting how much free ligand concentration is needed to occupy receptors. Because it appears with ligand concentration in the occupancy relationship, changing Kd changes the concentration at which occupancy rises. A smaller Kd indicates tighter binding, helping pharmacologists compare the relative affinities of different ligands for the same receptor.
At concentrations well below Kd, increases in free ligand can produce substantial changes in receptor occupancy. As concentration continues to rise, progressively more receptors are occupied until occupancy approaches saturation. This nonlinear pattern helps explain why increasing drug concentration may eventually produce smaller increases in target engagement, even though ligand exposure continues to increase.
Receptor occupancy describes binding, but the resulting effect also depends on receptor coupling and signal amplification. Consequently, similar occupancy levels can be associated with different pharmacological responses when receptors transmit signals with different efficiencies. Separating binding from downstream signaling helps researchers interpret concentration-response relationships without assuming that every occupied receptor produces an identical effect.
Researchers can insert the free ligand concentration and the relevant Kd into the relationship [L]/([L] + Kd). Repeating this calculation across concentrations shows how target engagement changes as exposure increases. The resulting values support comparisons between ligands and help identify concentration ranges associated with low, intermediate, or near-saturating receptor occupancy.
When ligand concentrations are considered alongside their Kd values, occupancy patterns reveal differences in binding affinity. A ligand associated with a smaller Kd reaches comparable receptor occupancy at a lower free concentration than a ligand with a larger Kd. This comparison helps pharmacologists evaluate target engagement and distinguish stronger from weaker receptor binding.
During therapeutic development, occupancy estimates help connect drug concentration with receptor engagement, desired efficacy, and selectivity. Pharmacologists can use these relationships to anticipate whether a candidate reaches its target at relevant concentrations and to compare compounds with different affinities. Because signaling amplification also affects outcomes, occupancy serves as one component of broader pharmacological interpretation.