Linked Life Data

21314091

Source:http://linkedlifedata.com/resource/pubmed/id/21314091

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2011-3-15
pubmed:abstractText
The EF hand, a helix-loop-helix structure, is one of the most common motifs found in animal genomes, and EF-hand Ca(2+)-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 Ca(2+)-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 Ca(2+), and our group and others established that solution NMR spectroscopy is well suited for this task. We pinpointed residues critical to the differences in Ca(2+) response of calbindin D(9k) and calmodulin (CaM), homologous EFCaBPs from different functional classes, 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 Ca(2+) ions: this cooperativity provides EFCaBPs with the ability to detect the relatively small changes in concentration that constitute Ca(2+) 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 in vertebrates. 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 Ca(2+) and its interaction with its cellular target Kar1. These results provided clear examples of how subtle differences in sequence fine-tune EFCaBPs to interact with their specific targets. 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 Ca(2+) regulation of gating functions of voltage-gated sodium channels in which both CaM and an intrinsic EF-hand domain serve as coupled Ca(2+) sensors. A 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.
pubmed:grant
http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-11, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-12, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-13, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-14, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-15, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-16, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-17, http://linkedlifedata.com/resource/pubmed/grant/R01 GM040120-18, http://linkedlifedata.com/resource/pubmed/grant/R01 GM056307-12, http://linkedlifedata.com/resource/pubmed/grant/R01 GM056307-13, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-01, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-02, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-03, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-04, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-05, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-06, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-07, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-08, http://linkedlifedata.com/resource/pubmed/grant/R01 GM062112-08S1, http://linkedlifedata.com/resource/pubmed/grant/R03 TW006005-01, http://linkedlifedata.com/resource/pubmed/grant/R03 TW006005-02, http://linkedlifedata.com/resource/pubmed/grant/R03 TW006005-03, http://linkedlifedata.com/resource/pubmed/grant/T32 GM008320-14, http://linkedlifedata.com/resource/pubmed/grant/T32 GM008320-15
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1520-4898
pubmed:author
pubmed:copyrightInfo
© 2011 American Chemical Society
pubmed:issnType
Electronic
pubmed:day
15
pubmed:volume
44
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
171-9
pubmed:meshHeading
pubmed-meshheading:21314091-Amino Acid Motifs, pubmed-meshheading:21314091-Animals, pubmed-meshheading:21314091-Binding Sites, pubmed-meshheading:21314091-Calcium, pubmed-meshheading:21314091-Calcium-Binding Protein, Vitamin D-Dependent, pubmed-meshheading:21314091-Calcium-Binding Proteins, pubmed-meshheading:21314091-Calmodulin, pubmed-meshheading:21314091-Chromosomal Proteins, Non-Histone, pubmed-meshheading:21314091-EF Hand Motifs, pubmed-meshheading:21314091-Humans, pubmed-meshheading:21314091-Magnetic Resonance Spectroscopy, pubmed-meshheading:21314091-Models, Molecular, pubmed-meshheading:21314091-Protein Binding, pubmed-meshheading:21314091-Protein Conformation, pubmed-meshheading:21314091-Protein Structure, Tertiary, pubmed-meshheading:21314091-Signal Transduction, pubmed-meshheading:21314091-Sodium Channels, pubmed-meshheading:21314091-Structure-Activity Relationship, pubmed-meshheading:21314091-Thermodynamics, pubmed-meshheading:21314091-Vertebrates
pubmed:year
2011
pubmed:articleTitle
Relating form and function of EF-hand calcium binding proteins.
pubmed:affiliation
Department of Biochemistry and Chemistry, Vanderbilt University, Nashville, Tennessee 37232-8725, USA. walter.chazin@vanderbilt.edu
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural