Relating Form and Function of EF-Hand Calcium Binding Proteins

The EF hand, a helix-loop-helix structure, is one of the most common motifs found in animal genomes, and EF-hand Ca2+-binding proteins (EFCaBPs) are widely distributed throughout the cell. However, researchers remain confounded by a lack of understanding of how peptide sequences code for specific functions and by uncertainty about the molecular mechanisms that enable EFCaBPs to distinguish among many diverse cellular targets. Such knowledge could define the roles of EFCaBPs in health and disease and ultimately enable control or even design of Ca2+-dependent functions in medicine and biotechnology. In this Account, we describe our structural and biochemical research designed to understand the sequence-to-function relationship in EFCaBPs. The first structural goal was to define conformational changes induced by binding Ca2+, and our group and others established that solution NMR spectroscopy is well suited for this task We pinpointed residues critical to the differences in Ca2+ response of calbindin D-9k and calmodulin (CaM), homologous EFCaBPs from different functional dosses, by using direct structure determination with site-directed mutagenesis and protein engineering. Structure combined with biochemistry provided the foundation for identifying the fundamental mechanism of cooperativity in the binding of Ca2+ ions: this cooperativity provides EFCaBPs with the ability to detect the relatively small changes in concentration that constitute Ca2+ signals. Using calbindin D-9k as a model system, studies of the structure and fast time scale dynamics of each of the four ion binding states in a typical EF-hand domain provided direct evidence that site-site communication lowers the free energy cost of reorganization for binding the second ion. Our work has also extended models of how EFCaBPs interact with their cellular targets. We determined the unique dimeric architecture of S100 proteins, a specialized subfamily of EFCaBPs found exclusively invertebrates. We described the implications for how these proteins transduce signals and went on to characterize interactions with peptide fragments of important cellular targets. Studies of the CaM homolog centrin revealed novel characteristics of its binding of Ca2+ and its interaction with its cellular target Kar1. These results provided dear examples of how subtle differences in sequence fine-tune EFCaBPs to interact with their specific toilets. The structural approach stands at a critical crossroad, shifting in emphasis from descriptive structural biochemistry to integrated biology and medicine. We present our dual-molecular-switch model for Ca2+ regulation of gating functions of voltage-gated sodium channels in which both CaM and an intrinsic EF-hand domain serve as coupled Ca2+ sensors. P, second example involves novel EFCaBP extracellular function, that is, the role of S100A8/S100A9 heterodimer in the innate immune response to bacterial pathogens. A mechanism for the antimicrobial activity of S100A8/S100A9 was discovered. We describe interactions of S100A8/S100A9 and S100B with the cell surface receptor for advanced glycation end products. Biochemical and structural studies are now uncovering the mechanisms by which EFCaBPs work and are helping to define their biological activities, while simultaneously expanding knowledge of the roles of these proteins in normal cellular physiology and the pathology of disease.