Nuclear-spin relaxation induced by shape fluctuations in membrane vesicles

Area of Science:

• Biophysics
• Materials Science

Background:

• Nuclear-spin relaxation is influenced by molecular dynamics.
• Membrane fluctuations affect physical properties.

Purpose of the Study:

• Calculate nuclear-spin relaxation rates due to vesicle shape fluctuations.
• Investigate the relationship between these rates and membrane bending rigidity.

Main Methods:

• Theoretical calculation of relaxation rates.
• Analysis of fluctuations in unilamellar quasispherical vesicles.

Main Results:

• Fluctuations yield a relaxation rate proportional to the inverse Larmor frequency in the kHz range.
• This contrasts with previous findings for planar membranes.

Conclusions:

• Vesicle shape fluctuations offer a method to determine membrane bending rigidity.
• The observed relaxation rate dependence provides new insights into membrane dynamics.