Diethylstilbestrol (DES) has estrogenic activity even though...

Name: Problem 49, Chapter 23: Organic chemistry with biological applications
Uploaded: 2020-08-06T17:44:58-08:00
Duration: 3 min 27 s
Channel: Kendrick Buford
Description: Diethylstilbestrol (DES) has estrogenic activity even though it is structurally unrelated to steroids. Once used as an additive in animal feed, DES has been implicated as a causative agent in several types of cancer. Show how DES can be drawn so that it is sterically similar to estradiol.

Diethylstilbestrol (DES) has estrogenic activity even though it is structurally unrelated to steroids. Once used as an additive in animal feed, DES has been implicated as a causative agent in several types of cancer. Show how DES can be drawn so that it is sterically similar to estradiol.

Key Concepts

Structure-Activity Relationship (SAR)

SAR examines how the specific molecular features of a compound relate to its activity at biological targets. In the context of estrogenic compounds, SAR helps explain why molecules like DES can mimic estradiol’s effects despite having different core structures, as long as the critical spatial arrangement of functional groups necessary for receptor binding is maintained.

Molecular Conformation and Steric Similarity

Molecular conformation pertains to the three?dimensional shape of a molecule, which is crucial for its interaction with biological receptors. Steric similarity involves aligning key features of a molecule in space so that it can effectively mimic the geometry of another molecule. This concept is essential when drawing DES in a way that it adopts a conformation similar to estradiol, thereby enabling it to fit into the estrogen receptor’s binding pocket.

Receptor-Ligand Interactions

This concept focuses on the dynamic interplay between a molecule (ligand) and its corresponding receptor, relying heavily on the spatial and electronic complementarity of the two. Understanding receptor-ligand interactions provides insight into how non-steroidal compounds, when drawn to exhibit a similar three-dimensional arrangement as endogenous steroids, can activate or inhibit receptor functions, leading to biological effects such as estrogenic activity.

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