Abstract
In this chapter I begin with a historical perspective of membrane models, starting in the early twentieth century. As these membrane models evolved, so did experiments to characterize the structure and water content of purified lipid bilayers. The wide-spread use of the X-ray gravimetric, or Luzzati method, is critically discussed. The main motivation of the gravimetric technique is to determine the number of water molecules/lipid, nW, and then derive other important structural quantities, such as area/lipid, AL. Subsequent experiments from the Nagle/Tristram-Nagle laboratory using X-ray and neutron scattering, first determine AL and then calculate nW, using molecular lipid VL and water VW volumes. This chapter describes the details of our volume experiments to carefully measure VL. Our results also determine nW′, the steric water associated with the lipid headgroup, and how our calculated value compares to many literature values of tightly-associated headgroup water.
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Abbreviations
- DSC:
-
Differential scanning calorimetry
- NMR:
-
Nuclear magnetic resonance
- EPR:
-
Electron spin resonance
- FTIR:
-
Fourier transform infrared resonance
- Tm:
-
Main transition melting temperature
- nW :
-
Number of waters/lipid
- nW′:
-
Steric number of waters/lipid
- AL :
-
Area/lipid
- VL :
-
Molecular volume/lipid
- VW :
-
Molecular volume/water
- MLVs:
-
Multilamellar vesicles
- ULVs:
-
Unilamellar vesicles
- D, D-space:
-
X-ray lamellar D-spacing
- d, d-space:
-
X-ray wide-angle chain spacing
- η:
-
Fluctuation parameter
- KC :
-
Bending modulus
- B:
-
Bulk modulus
- un :
-
Vertical displacement
- I(qz):
-
X-ray intensity
- |F(qz)|:
-
Form factor
- MD simulation:
-
Molecular dynamics simulation
- 2DC :
-
Hydrocarbon thickness
- DB :
-
Bilayer thickness
- DH′:
-
Headgroup thickness
- interdig.:
-
Interdigitated
- DPPC:
-
Dipalmitoylphosphatidylcholine
- DSPC:
-
Distearoylphosphatidylcholine
- DHPC:
-
Dihexadecanoyl-phosphatidylcholine
- DLPE:
-
Dilauroylphosphatidylethanolamine
- DMPC:
-
Dimyristoylphosphatidylcholine
- DMPE:
-
Dimyristoylphosphatidylethanolamine
- DLPC:
-
Dilauroylphosphatidylcholine
- DOPC:
-
Dioleoylphosphatidylcholine
- DOPS:
-
Dioleoylphosphatidylserine
- EggPC:
-
Egg phosphatidylcholine
- POPC:
-
Palmitoyloleoylphosphatidylcholine
- SOPC:
-
Stearoyloleoylphosphatidylcholine
- diC22:1PC:
-
Dierucoylphosphatidylcholine
- 18:0:22:5PC:
-
Stearoyldocosapentaenoylphosphatidylcholine
- 18:0-22:6PC:
-
Stearoyldocosahexaenoylphosphatidylcholine
- diphytanoylPC:
-
Diphytanoylphosphatidylcholine
- DLPG:
-
Dilauroylphosphatidylglycerol
- DMPG:
-
Dimyristoylphosphatidylglycerol
- POPG:
-
Palmitoyloleoylphosphatidylglycerol
- SOPG:
-
Stearoyloleoylphosphatidylglycerol
- DOPG:
-
Dioleoylphosphatidylglycerol
- TMCL:
-
Tetramyristoylcardiolipin
- DMPS:
-
Dimyristoylphosphatidylserine
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Acknowledgements
The author would like to thank Ben Sauerwine for preparing the snapshot of fluctuating bilayers from the Monte Carlo simulation. Funding was from NIH GM 44976.
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Tristram-Nagle, S. (2015). Use of X-Ray and Neutron Scattering Methods with Volume Measurements to Determine Lipid Bilayer Structure and Number of Water Molecules/Lipid. In: Disalvo, E. (eds) Membrane Hydration. Subcellular Biochemistry, vol 71. Springer, Cham. https://doi.org/10.1007/978-3-319-19060-0_2
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