PMID: 188653Dec 11, 1976

Difficulties in determining accurate molecular motion parameters from proton relaxation enhancement measurements as illustrated by the immunoglobulin G-Gd(III) system

European Journal of Biochemistry
D R BurtonS Wain-Hobson

Abstract

Longitudinal and traverse proton magnetic relaxation rates for water in the hydration sphere of Gd(III) bound to non-immune rabbit IgG (immunoglobulin G) have been determined over a wide range of frequencies (4-84 MHz) at constant temperature (19 degrees C) using pulsed nuclear magnetic resonance spectrometry. The rates have also been determined at temperatures between 0 and 40 degrees C for two frequencies (61 and 84 MHz). The rates were fitted to existing theory using a computer least-squares procedure. Further computer analysis was then carried out to determine the sensitivity of the best-fit error to variation in the variable parameters in the theoretical expressions used. These include the water co-ordination number (q) for which it was found large variations could occur (between approximately 2 and 8) for only small changes in the error of best-fit. It was concluded that a slow exchange contribution to the relaxation rates was important in deciding which parameters are poorly determined. A rotational correlation time (tau r) was obtained which suggested there might be considerable internal motion of the Fc region (C-terminal half of heavy-chain dimer) of the IgG molecule. However the possibility of large errors in this va...Continue Reading

References

Jul 1, 1975·The Biochemical Journal·S K DowerC A Sunderland
Feb 1, 1973·Proceedings of the National Academy of Sciences of the United States of America·S H KoenigC F Brewer
Aug 1, 1970·Journal of Molecular Biology·J YguerabideL Stryer

Citations

Aug 14, 2003·Magnetic Resonance Imaging·J MørkenborgJ Frøkiaer
Jan 1, 1985·IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society·J C Gore
Jan 1, 1985·Magnetic Resonance Imaging·M A Brown
Jun 7, 2018·Chemistry : a European Journal·Steven K TaylorMilan N Stojanovic
Oct 20, 2020·Investigative Radiology·Sergey ShuvaevPeter Caravan

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