By Ron Wallace
The quick velocity of discovery in membrane molecular biology is revealing unforeseen complexity on the boundary of the cellphone. The membrane seems to be greater than a skinny movie isolating aqueous cubicles or an anchoring web site for proteins. certainly, it exhibits many symptoms of being a dynamic, regulatory constitution composed of temporary lipid ensembles often called rafts or microdomains. those seem to control the membrane-protein kinetics that is the foundation of many mobile features. This e-book describes these regulatory good points intimately and offers facts that they function within the neuron.
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Extra info for Membrane Microdomain Regulation of Neuron Signaling
With increasing protein content (and paralleling decrease in bilayer thickness) an increase in helix tilt occurred. Moreover, the degree of tilt appeared to be correlated with protein function. Ion channels may also respond by chain tilt to hydrophobic mismatch. This possibility was strongly indicated by the fluorescence-emission studies conducted by Williamson et al. , 2002). ” This observation is consistent with other studies indicating that Trp residues of multiple membrane-spanning proteins tend to be located at the lipid-water interface (Killian, 1998).
Specifically, dipole moment (μ) is given as –(dE/d ξ ) and r quadrupole moment (θ) is given as ½ (d2E/d ξ ). Similarly, polarizability (α) is r given as –(d2E/d ξ 2) and varies with the oscillation of an applied electric field (Dykstra, 1997). The latter feature is consistent with the complex, interacting fields (with time-dependent variation in strength) that are encountered in actual membranes. (On this point see Kinnunen and Virtanen, 1986). The use of a polymer model stabilized by methylene linkages was justified by computational pragmatics.
The more optimized membrane systems would continue to 22 Ron Wallace display distinctive fluoroscopic signatures for successive sets of gated receptors when the less optimized systems were displaying a plateau response. The latter signal would describe a situation of asymptotic searching for a local energy minimum. In terms of the Atmar-based formalism, given a distinctive signature S of successive membrane states S: Q1 , Q2 ,. . QN associated with escalating complexity of input I: [I1], [I1,2], [I1,2,3 ], .