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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Function-Related Dynamics in Multi-Spanning Helical Membrane Proteins Revealed by Solution NMR.

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Nuclear Magnetic Resonance (NMR) reveals how multi-spanning membrane protein dynamics, like those in ion channels and transporters, relate to their biological functions. This helps understand their structural basis for function.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Multi-spanning membrane proteins are crucial for cellular functions, including information and material transport across membranes.
  • Their biological activity is intrinsically linked to conformational dynamics.
  • Understanding these dynamics is key to elucidating protein function.

Purpose of the Study:

  • To review studies utilizing Nuclear Magnetic Resonance (NMR) to investigate the dynamics of multi-spanning membrane proteins.
  • To highlight how quantitative dynamics information aids in understanding the structural basis of protein function.
  • To showcase applications in key protein classes like ion channels, GPCRs, and transporters.

Main Methods:

  • Solution Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Analysis of semi-atomic resolution dynamics.
  • Correlation of dynamics data with protein function.

Main Results:

  • NMR-derived dynamics information can distinguish functionally relevant motions from random fluctuations.
  • Quantitative dynamics data provides insights into the structural mechanisms of membrane protein function.
  • Specific examples demonstrate the contribution of NMR to understanding ion channels, GPCRs, and transporters.

Conclusions:

  • NMR is a powerful tool for characterizing the dynamics of multi-spanning membrane proteins.
  • Understanding protein dynamics is essential for deciphering their structure-function relationships.
  • This approach advances the study of critical membrane protein families.