A. Watts et al., Structural descriptions of ligands in their binding site of integral membrane proteins at near physiological conditions using solid-state NMR, EUR BIOPHYS, 28(1), 1998, pp. 84-90
Citations number
41
Categorie Soggetti
Biochemistry & Biophysics
Journal title
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
Using solid-state NMR approaches, it is now possible to define the structur
e and dynamics of binding for a small, isotopically (H-2, (13)G, F-19, N-15
) labelled ligand, prosthetic group or solute in its binding site of a memb
rane-bound protein at near physiological conditions in natural membrane fra
gments or in reconstituted complexes. Studies of oriented membranes permit
the orientational bond vectors of labelled groups to be determined to good
precision, as shown for retinal in bacteriorhodopsin and bovine rhodopsin.
Using novel magic angle spinning NMR methods on membrane dispersions, high-
resolution NMR spectra can be obtained. Dipolar couplings can be reintroduc
ed into the spectrum of labelled ligands in their binding sites of membrane
-bound proteins to give interatomic distances to high precision (+/-0.5 Ang
strom). Relaxation and cross-polarization data give estimates for the kinet
ics for on-off rates for binding. In addition, chemical shifts can be measu
red directly to help provide details of the binding environment for a bound
ligand, as shown for analogues of drugs used in peptic ulcer treatment in
the gastric ATPase, and for acetylcholine in the acetylcholine receptor.