Effects of domain connection and disconnection on the yields of in-plane bimolecular reactions in membranes

• Published in: Biophysical journal Vol. 63; no. 6; pp. 1506 - 1512
• Main Authors: Melo, E.C., Lourtie, I.M., Sankaram, M.B., Thompson, T.E., Vaz, W.L.
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Elsevier Inc 01-12-1992; Biophysical Society
• Subjects: Artificial membranes and reconstituted systems; Biological and medical sciences; Biophysical Phenomena; Biophysics; domains; effects on; Enzymes - chemistry; Fundamental and applied biological sciences. Psychology; kinetics; Lipid Bilayers - chemistry; lipid membranes; Macromolecular Substances; Membrane physicochemistry; Membrane Proteins - chemistry; Membranes - chemistry; Models, Chemical; Molecular biophysics; Molecular Conformation; Molecular Structure; reaction; structures; Theoretical study; Lipids; Artificial membrane; Localization; Bilayer; Enzymatic reaction
• ISSN: 0006-3495; 1542-0086
• DOI: 10.1016/S0006-3495(92)81735-6

It has recently been shown (Vaz, W.L.C., E.C.C. Melo, and T.E. Thompson. 1989. Biophys. J. 56:869–875; 1990. Biophys. J. 58:273–275) that in lipid bilayer membranes in which ordered and disordered phases coexist, the ordered phase can form a two-dimensional reticular structure that subdivides the coexisting disordered phase into a disconnected domain structure. Here we consider theoretically the yields of bimolecular reactions between membrane-localized reactants, when both the reactants and products are confined to the disordered phase. It is shown that compartmentalization of reactants in disconnected domains can lead to significant reductions in reaction yields. The reduction in yield was calculated for classical bimolecular processes and for enzyme-catalyzed reactions. These ideas can be used to explain certain experimental observations.