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¹H NMR: Complex Splitting

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

The Nucleosome Core Particle

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...

Protein Digestion

Protein Digestion

Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.

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Related Experiment Video

Updated: Jul 6, 2026

Quantitative Approaches for Scoring in vivo Neuronal Aggregate and Organelle Extrusion in Large Exopher Vesicles in C. elegans

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Protons extruded by NHE1: digestive or glue?

Christian Stock¹, Rosa Angela Cardone, Giovanni Busco

¹Institute of Physiology II, University of Münster, Robert-Koch-Str. 27b, D-48149 Münster, Germany.

European Journal of Cell Biology

|March 11, 2008

Summary

The Na(+)/H(+) exchanger 1 (NHE1) regulates cell migration and invasion. Extracellular acidification by NHE1 activity aids matrix digestion and cell adhesion, crucial for cell movement.

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Area of Science:

Cell Biology
Physiology
Biochemistry

Background:

Cell migration and invasion are fundamental to numerous physiological and pathophysiological processes.
The Na(+)/H(+) exchanger 1 (NHE1) is a ubiquitously expressed protein crucial for directed cell locomotion.
NHE1 influences cell migration through intracellular mechanisms affecting cell volume, pH, cytoskeleton, and signaling.

Purpose of the Study:

To review the extracellular mechanisms by which NHE1 activity contributes to cell migration and invasion.
To highlight the role of NHE1-mediated proton extrusion in facilitating extracellular matrix digestion and cell adhesion.

Main Methods:

Literature review focusing on NHE1's role in cell migration.
Analysis of the impact of extracellular acidification on proteinase activity and cell-matrix interactions.

Main Results:

NHE1 activity leads to local extracellular acidification.
This acidification optimizes conditions for proteinase activity at invadopodia/podosomes, aiding extracellular matrix degradation.
Extracellular acidification also enhances cell-matrix interaction and adhesion at the leading edge of migrating cells.

Conclusions:

NHE1 plays a critical role in cell migration and invasion through both intracellular and extracellular mechanisms.
Extracellular acidification by NHE1 is a key factor promoting cell invasion by facilitating matrix degradation and adhesion.