By Philip L. Yeagle (auth.), Lawrence J. Berliner, Jacques Reuben (eds.)
We are happy to give quantity nine of our hugely winning sequence, which now celebrates 12 years of supplying the magnetic resonance group with topical, authoritative chapters on new facets of organic magnetic resonance. As continually, we attempt to give a range of subject assurance in each one quantity, starting from purposes of in vivo magnetic resonance to extra primary points of electron spin resonance and nuclear magnetic resonance. Philip Yeagle provides an eagerly awaited bankruptcy on 31p NMR stories of membranes and membrane protein interactions. Alan Marshall has con tributed chapters to the amount: one, with Jiejun Wu, describes magnetic resonance reports of 5S-RNA as probes of its constitution and conformation; the secon
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Example text
Interfacial Lipids. - ....... 0 ! -o---------_ '6. 100 200 300 LIPID/PROTEIN (MOLE RATIO) Figure 18. 31p Tl as a function of lipid-protein ratio for membranes containing protein. , 1984). Phosphorus NMR of Membranes 45 between sites. The rapid exchange causes an averaging of the powder pattern observed. Only techniques with a short timescale of measurement are capable of detecting nonbound interfacial lipids. ESR of lipid spin labels is a good example (Griffith and Jost, 1976) because the threshold of the ESR experiment is about 10- 8 sec, compared to 10-4 sec for 31p NMR.
0 ! -o---------_ '6. 100 200 300 LIPID/PROTEIN (MOLE RATIO) Figure 18. 31p Tl as a function of lipid-protein ratio for membranes containing protein. , 1984). Phosphorus NMR of Membranes 45 between sites. The rapid exchange causes an averaging of the powder pattern observed. Only techniques with a short timescale of measurement are capable of detecting nonbound interfacial lipids. ESR of lipid spin labels is a good example (Griffith and Jost, 1976) because the threshold of the ESR experiment is about 10- 8 sec, compared to 10-4 sec for 31p NMR.
31p NMR AND MEMBRANE STRUCTURE AND DYNAMICS Phospholipid Headgroup Conformation Extensive examination of phospholipid headgroups using 31p NMR has been performed using both SUV and MLV. The studies on sonicated Phosphorus NMR of Membranes 31 vesicles will be considered first. Because of their homogeneity, the SUV make excellent subjects for measurements. When extrapolating conclusions obtained from these vesicles to biological membranes, however, the small size and consequently highly curved surface of the vesicles compared to most biological structures should be noted.
