A Quantitative Approach to Membrane Binding of Human Ubiquitous Mitochondrial Creatine Kinase Using Surface Plasmon Resonance |
| |
Authors: | Uwe Schlattner Theo Wallimann |
| |
Affiliation: | (1) Institute of Cell Biology, ETH Zürich, CH-8093 Zürich, Switzerland;(2) Institute of Cell Biology, ETH Zürich, CH-8093 Zürich, Switzerland |
| |
Abstract: | We have evaluated surface plasmon resonance with avidin-biotin immobilized liposomes tocharacterize membrane binding of ubiquitous mitochondrial creatine kinase (uMtCK). Whilethe sarcomeric sMtCK isoform is well known to bind to negatively charged phospholipids,especially cardiolipin, this report provides the first experimental evidence on the membraneinteraction of an uMtCK isoform. Qualitative measurements showed that liposomes containing16% (w/w) cardiolipin bind octameric as well as dimeric human uMtCK and also cytochromec, but not bovine serum albumin. Quantitative parameters could be derived only for themembrane interaction of octameric human uMtCK using an improved analytical approach.Association and dissociation kinetics of octameric uMtCK fit well to a model for heterogeneousinteraction suggesting two independent binding sites. Rate constants of the two sites differedby one order of magnitude, while their affinity constants were both about 80–100 nM. Thedata obtained demonstrate that surface plasmon resonance with immobilized liposomes is asuitable approach to characterize the binding of peripheral proteins to a lipid bilayer and thatthis method yields consistent quantitative binding parameters. |
| |
Keywords: | Mitochondrial creatine kinase protein-lipid interaction membrane binding cardiolipin surface plasmon resonance |
本文献已被 SpringerLink 等数据库收录! |
|