Measuring the effect of ligand binding on the interface stability of multimeric proteins using dynamic light scattering.
We have demonstrated that an approach using guanidine hydrochloride at low concentrations to progressively disrupt protein-protein interactions can be quantitated using dynamic light scattering. This approach is sensitive enough to detect ligand-induced changes of subunit-subunit interactions for homo-hexameric glutamate dehydrogenase, allowing ΔΔG of reversible subunit dissociation to be calculated. The use of dynamic light scattering makes this approach generally applicable to soluble proteins to monitor the relative strength of protein-protein interactions with a particular emphasis on assessing the impact of ligand binding on such interfaces.
Marion
James D
JD
Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, VA 23298, USA.
Van
Danielle N
DN
Bell
J Ellis
JE
Bell
Jessica K
JK
D005969:Glutamate Dehydrogenase / Q000737:chemistry*; D019791:Guanidine / Q000737:chemistry; D008024:Ligands; D008027:Light; D011485:Protein Binding; D011489:Protein Denaturation; D021122:Protein Subunits / Q000737:chemistry; D012542:Scattering, Radiation
D008024:Ligands; D021122:Protein Subunits; D005969:Glutamate Dehydrogenase; D019791:Guanidine