Molecular Similarity
Molecular Similarity - Related Videos
01:26
Causes of Similarity-Dissimilarity Effect
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2025
The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
12:02
Molecular Evolution of the Tre Recombinase
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Cited by 4 •
2008
Here we report the generation of Tre recombinase through directed, molecular evolution. Tre recombinase recognizes a pre-defined target sequence within the LTR sequences of the HIV-1 provirus, resulting in the excision and eradication of the provirus from infected human cells. While still in its infancy, directed molecular evolution will allow the creation of custom enzymes that will serve as tools of molecular surgery and molecular medicine.
01:23
Factors Influencing Attraction III: Similarity
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2025
The similarity hypothesis suggests that individuals are more likely to form relationships with others who share similar attitudes, beliefs, values, and interests. This concept has been widely studied in social psychology, demonstrating that perceived similarity fosters interpersonal attraction. In an experiment supporting this hypothesis, participants were presented with fabricated information indicating that strangers held attitudes similar to their own. The results showed that participants...
08:12
A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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Cited by 3 •
2022
The protocol presents an experimental psychophysics paradigm to obtain large quantities of similarity judgments, and an accompanying analysis workflow. The paradigm probes context effects and enables modeling of similarity data in terms of Euclidean spaces of at least five dimensions.
09:55
Molecular Cloning
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2023
Molecular cloning is a set of methods, which are used to insert recombinant DNA into a vector - a carrier of DNA molecules that will replicate recombinant DNA fragments in host organisms. The DNA fragment, which may be a gene, can be isolated from a prokaryotic or eukaryotic specimen. Following isolation of the fragment of interest, or insert, both the vector and insert must be cut with restriction enzymes and purified. The purified pieces are joined together though a technique called...
FAQs
The representation determines which molecular features a comparison can detect. Fingerprints encode structural or chemical patterns, descriptors summarize selected molecular characteristics, and three-dimensional representations capture spatial features. Choosing among them changes the meaning of a similarity score, so researchers can align the comparison with the biological question, such as finding compounds with related structures or potentially related effects.
The Tanimoto coefficient converts overlap between two molecular representations into a quantitative similarity value. A higher value indicates greater shared content within the chosen fingerprint or descriptor space, whereas a lower value indicates less overlap. Its interpretation therefore depends on how the molecules were represented; the score does not have a universal meaning independent of that representation.
Three-dimensional feature comparisons can complement structural fingerprints by examining whether molecules share relevant spatial features. This distinction matters when compounds differ in their detailed connectivity yet present comparable three-dimensional characteristics. Using multiple representations can broaden similarity analysis, helping researchers examine relatedness from structural, chemical, and spatial perspectives rather than relying on one molecular encoding.
Similarity analysis can expose structure–activity relationships by linking recurring molecular features with observed biological activity or interaction patterns. Researchers can compare compounds, identify features shared by molecules with related outcomes, and use those patterns to prioritize compounds for further study. This makes similarity useful for translating chemical comparisons into hypotheses about biological function and desired effects.
A basic ligand-based virtual-screening workflow represents molecules computationally, compares candidates with compounds associated with a biological activity, and ranks those showing stronger similarity. The resulting shortlist focuses experimental attention on compounds that resemble known relevant molecules. This approach is useful when structural or activity information from existing compounds can guide the selection of new candidates.
Drug repurposing uses molecular similarity to connect compounds that may share chemical or biological behavior, even when a compound is being considered for a different use. Similar comparisons can also support target prediction by relating a molecule to compounds with known interaction patterns. These relationships help prioritize experiments and investigate possible new uses or biological targets.
Analyzing similar molecules across chemical space helps researchers examine relationships among compounds and connect chemical features with biological effects or interaction patterns. In biology, this perspective supports structure–activity analysis and guides the design of compounds with desired biological effects. It also helps determine which candidates should receive experimental attention based on their molecular relationships.