Non Superposable
Non Superposable - Related Videos
09:38
Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
0 Views •
Cited by 1 •
2021
Presented here is a comprehensive protocol to perform ultrafast force-clamp experiments on processive myosin-5 motors, which could be easily extended to the study of other classes of processive motors. The protocol details all the necessary steps, from the setup of the experimental apparatus to sample preparation, data acquisition and analysis.
11:34
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
0 Views •
Cited by 7 •
2017
This method aims at locating vertical subsurface defects. Here, we couple a laser with a spatial light modulator and trigger its video input to heat a sample surface deterministically with two anti-phased modulated lines while acquiring highly resolved thermal images. The defect position is retrieved from evaluating thermal wave interference minima.
02:52
Stereoisomerism
0 Views •
2020
Isomerism in Complexes Isomers are different chemical species that have the same chemical formula. Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
09:42
Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
0 Views •
Cited by 17 •
2016
Channels for the transportation of water molecules in enzymes influence active site solvation and catalysis. Herein we present a protocol for the engineering of these additional catalytic motifs based on in silico computer modeling and experiments. This will enhance our understanding of the influence of solvent dynamics on enzyme catalysis.
11:02
Presynaptically Silent Synapses Studied with Light Microscopy
0 Views •
Cited by 14 •
2010
Glutamatergic synapses can switch from an active mode to a silent mode. We demonstrate that presynaptic activity status in dissociated culture of rodent neurons is visualized using a fixable form of the FM1-43 dye to visualize active synapses and immunostaining with vGluT-1 antibody to visualize all glutamate synapses.
FAQs
Four different substituents create a distinct three-dimensional arrangement around the tetrahedral atom. Because each position is occupied by a different group, rotating the molecule cannot exchange those arrangements in a way that makes them coincide. Reflection produces the corresponding mirror-image structure, so the spatial relationship among substituents becomes the source of the stereochemical distinction.
Non-superposability identifies a spatial relationship rather than a change in molecular connectivity. Enantiomers have corresponding atoms and substituents arranged as mirror images, yet their three-dimensional forms cannot be made identical by reorientation. This distinction matters because two molecules may appear equivalent in a flat structural representation while remaining different when their full three-dimensional arrangements are considered.
Biological receptors and enzymes are themselves three-dimensional systems, so their binding sites can recognize the spatial arrangement of substituents. Non-superposable mirror-image molecules may therefore interact differently with the same biological target, even when they contain the same atoms and bonds. This stereochemical selectivity helps explain why molecular shape is important in biological response and pharmaceutical design.
Begin by looking for a tetrahedral atom attached to four different substituents, because this arrangement commonly produces the relevant stereochemical relationship. Then compare the three-dimensional placement of those groups with the corresponding mirror-image arrangement. Testing whether rotation or translation can align every part provides a practical way to determine whether the structures remain distinct.
The presence of non-superposable molecular forms supports the analysis of optical activity and stereochemical reaction outcomes. Since enantiomers differ in three-dimensional arrangement, reactions or measurements involving chiral environments may not treat them identically. Examining this relationship allows chemists to connect molecular geometry with observed behavior rather than relying only on two-dimensional formulas.
Recognizing non-superposability is especially important when designing pharmaceuticals whose effects depend on interactions with biological receptors or enzymes. Mirror-image forms can produce different biological interactions because their spatial arrangements differ. Evaluating these forms during molecular analysis helps researchers consider which structure may provide the desired biological effect and supports more deliberate interpretation of stereochemical behavior.