Pre-Transition Effects Mediate Forces of Assembly between Transmembrane Proteins: The Orderphobic Effect
| Autor: | Berend Smit, Shachi Katira, David Chandler, Suriyanarayanan Vaikuntanathan, Kranthi K. Mandadapu |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
cond-mat.soft Phase transition Materials science Bilayer Biophysics Biological Sciences Transmembrane protein Hydrophobic effect 03 medical and health sciences Hydrophobic mismatch 030104 developmental biology Membrane Chemical physics Physical Sciences Chemical Sciences physics.bio-ph Elasticity (economics) Lipid bilayer cond-mat.stat-mech |
| Zdroj: | BIOPHYSICAL JOURNAL, vol 110, iss 3 Katira, S; Mandadapu, KK; Vaikuntanathan, S; Smit, B; & Chandler, D. (2016). Pre-Transition Effects Mediate Forces of Assembly between Transmembrane Proteins: The Orderphobic Effect. BIOPHYSICAL JOURNAL, 110(3), 567A-567A. doi: 10.1016/j.bpj.2015.11.3037. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/52v1t4bk Biophysical Journal, vol 110, iss 3 |
| Popis: | Author(s): Katira, Shachi; Mandadapu, Kranthi K; Vaikuntanathan, Suriyanarayanan; Smit, Berend; Chandler, David | Abstract: We present a mechanism for a generic and powerful force of assembly and mobility for transmembrane proteins in lipid bilayers. This force is a pre-transition (or pre-melting) effect for the first-order transition between ordered and disordered phases in the host membrane. Using large scale molecular simulation, we show that a protein with hydrophobic thickness equal to that of the disordered phase embedded in an ordered bilayer stabilizes a microscopic order-disorder interface, and the stiffness of that interface is finite. When two such proteins approach each other, they assemble because assembly reduces the net interfacial free energy. In analogy with the hydrophobic effect, we refer to this phenomenon as the "orderphobic effect". The effect is mediated by proximity to the order-disorder phase transition and the size and hydrophobic mismatch of the protein. The strength and range of forces arising from the orderphobic effect are significantly larger than those that could arise from membrane elasticity for the membranes we examine. |
| Databáze: | OpenAIRE |
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