The multifunctional vitamin D binding protein (DBP) is an actin-sequestering protein present in blood. The crystal structure of the actin-DBP complex was determined at 2.4 A resolution. DBP binds to actin subdomains 1 and 3 and occludes the cleft at the interface between these subdomains ...
The multifunctional vitamin D binding protein (DBP) is an actin-sequestering protein present in blood. The crystal structure of the actin-DBP complex was determined at 2.4 A resolution. DBP binds to actin subdomains 1 and 3 and occludes the cleft at the interface between these subdomains. Most remarkably, DBP demonstrates an unusually large actin-binding interface, far exceeding the binding-interface areas reported for other actin-binding proteins such as profilin, DNase I and gelsolin. The fast-growing side of actin monomers is blocked completely through a perfect structural fit with DBP, demonstrating how DBP effectively interferes with actin-filament formation. It establishes DBP as the hitherto best actin-sequestering protein and highlights its key role in suppressing and preventing extracellular actin polymerization.
Related Citations:
Purification, crystallization and preliminary X-ray investigation of the complex of the human
vitamin D binding protein and rabbit muscle actin Bogaerts, I., Verboven, C., Rabijns, A., Waelkens, E., Van Baelen, H., De Ranter, C. (2001) Acta Crystallogr D Biol Crystallogr 57: 740
A structural basis for the unique binding features of the human vitamin D-binding protein Verboven, C., Rabijns, A., De Maeyer, M., Van Baelen, H., Bouillon, R., De Ranter, C. (2002) Nat Struct Biol 9: 131
Atomic structure of the actin:DNase I complex Kabsch, W., Mannherz, H.G., Suck, D., Pai, E.F., Holmes, K.C. (1990) Nature 347: 37
Organizational Affiliation:
Laboratorium voor Analytische Chemie en Medicinale Fysicochemie, Faculteit Farmaceutische Wetenschappen, K. U. Leuven, Belgium.
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