THEORETICAL NUCLEAR MAGNETIC RESONANCE-LINESHAPE STUDY OF A 2-SITE CHEMICAL-EXCHANGE MODEL OF SODIUM-IONS (I = 3/2) IN AN INTRACELLULAR ENVIRONMENT

We present a theoretical calculation of the lineshape function based on the solution of the semiclassical Liouville equation, of a two-site chemical exchange model of biological relevance. The bound site is allowed to be in the slow region regime that is the inverse quadrupole interaction of one bound site is in the same range as the reorientational correlation time. We compare different chemical exchange models, and several different physical situations are investigated. The variation of the width at half height (WHH) and the relative intensity (l/lo) is shown to be important, experimentally accessible quantities that are useful in order to discriminate between different model systems. © 1990, The Biophysical Society. All rights reserved.