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Related Concept Videos

SN2 Reaction: Mechanism02:27

SN2 Reaction: Mechanism

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The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...
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SN1 Reaction: Mechanism02:25

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
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Related Experiment Video

Updated: May 3, 2026

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
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The Notch transcription activation complex makes its move.

Doug Barrick1, Raphael Kopan

  • 1T.C. Jenkins Department of Biophysics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.

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|March 15, 2006
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Summary

Crystal structures reveal the Notch transcriptional activation complex. The ANK domain is integral to transcription and MAM binding, while the RAM domain may induce allosteric changes for derepression.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • The Notch signaling pathway is crucial for cell-to-cell communication and developmental processes.
  • Understanding the molecular mechanisms of Notch transcriptional activation is essential for deciphering its biological roles.

Discussion:

  • The crystal structures of the Notch transcriptional activation complex elucidate the roles of key domains.
  • The ANK (ankyrin repeat) domain of Notch is shown to be a critical component of the transcription complex, facilitating MAM binding.
  • The RAM (RBP-J associated molecule) domain is implicated in triggering allosteric structural changes necessary for the derepression of transcription.

Key Insights:

  • Notch ANK domain is integral to the transcription complex and supports MAM binding.
  • Notch RAM domain may induce allosteric changes for transcriptional derepression.
  • Structural insights provide a mechanistic basis for Notch-mediated gene regulation.

Outlook:

  • Further structural studies could reveal dynamic aspects of the Notch complex.
  • Investigating the functional consequences of RAM domain-mediated allosteric changes will be crucial.
  • These findings pave the way for understanding Notch pathway dysregulation in diseases.