Title : Structural influence of cation binding to recombinant human brain S100b: evidence for calcium-induced exposure of a hydrophobic surface.

Pub. Date : 1996 Jul 9

PMID : 8688416






10 Functional Relationships(s)
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1 Structural influence of cation binding to recombinant human brain S100b: evidence for calcium-induced exposure of a hydrophobic surface. Calcium S100 calcium binding protein B Homo sapiens
2 The dimeric calcium-binding protein S100b is proposed to undergo a calcium-induced structural change allowing it to interact, via a hydrophobic surface, with other proteins. Calcium S100 calcium binding protein B Homo sapiens
3 The dimeric calcium-binding protein S100b is proposed to undergo a calcium-induced structural change allowing it to interact, via a hydrophobic surface, with other proteins. Calcium S100 calcium binding protein B Homo sapiens
4 Previously it has been suggested that calcium binding to S100b leads to the exposure of at least one phenylalanine residue (Mani et al., 1982, 1983). Calcium S100 calcium binding protein B Homo sapiens
5 To study these effects, we monitored calcium binding to recombinant human S100b by NMR spectroscopy under different salt (KCI) conditions. Calcium S100 calcium binding protein B Homo sapiens
6 15N-Labeled glycine residues in S100b showed calcium-induced chemical shift changes similar to those reported for the related monomeric protein calbindin D9k, suggesting similar conformational changes are occurring in the calcium-binding loops of these two proteins. Calcium S100 calcium binding protein B Homo sapiens
7 15N-Labeled glycine residues in S100b showed calcium-induced chemical shift changes similar to those reported for the related monomeric protein calbindin D9k, suggesting similar conformational changes are occurring in the calcium-binding loops of these two proteins. Calcium S100 calcium binding protein B Homo sapiens
8 Calcium binding to S100b also resulted in a shifting and broadening of several 1H resonances from the Ca-S100b form only including those from the side chains of residues F14, F70, and F73 but not those of residue Y17. Calcium S100 calcium binding protein B Homo sapiens
9 Calcium binding to S100b also resulted in a shifting and broadening of several 1H resonances from the Ca-S100b form only including those from the side chains of residues F14, F70, and F73 but not those of residue Y17. Calcium S100 calcium binding protein B Homo sapiens
10 These observations are consistent with the calcium-induced exposure of at least one of these hydrophobic residues, resulting in self-association of the S100b dimer. Calcium S100 calcium binding protein B Homo sapiens