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2L51

Solution structure of calcium bound S100A16

Replaces:  2L0V
Summary for 2L51
Entry DOI10.2210/pdb2l51/pdb
Related2l50
NMR InformationBMRB: 17262
DescriptorProtein S100-A16, CALCIUM ION (2 entities in total)
Functional Keywordsmetal binding protein, ca(ii)s100a16, ef-hand protein, s100 protein
Biological sourceHomo sapiens (human)
Total number of polymer chains2
Total formula weight23532.69
Authors
Babini, E.,Bertini, I.,Borsi, V.,Calderone, V.,Hu, X.,Luchinat, C.,Parigi, G. (deposition date: 2010-10-22, release date: 2010-11-03, Last modification date: 2024-05-15)
Primary citationBabini, E.,Bertini, I.,Borsi, V.,Calderone, V.,Hu, X.,Luchinat, C.,Parigi, G.
Structural characterization of human S100A16, a low-affinity calcium binder.
J.Biol.Inorg.Chem., 16:243-256, 2011
Cited by
PubMed Abstract: The homodimeric structure of human S100A16 in the apo state has been obtained both in the solid state and in solution, resulting in good agreement between the structures with the exception of two loop regions. The homodimeric solution structure of human S100A16 was also calculated in the calcium(II)-bound form. Differently from most S100 proteins, the conformational rearrangement upon calcium binding is minor. This characteristic is likely to be related to the weak binding affinity of the protein for the calcium(II) ions. In turn, this is ascribed to the lack of the glutamate residue at the end of the S100-specific N-domain binding site, which in most S100 proteins provides two important side chain oxygen atoms as calcium(II) ligands. Furthermore, the presence of hydrophobic interactions stronger than for other S100 proteins, present in the closed form of S100A16 between the third and fourth helices, likely make the closed structure of the second EF-hand particularly stable, so even upon calcium(II) binding such a conformation is not disrupted.
PubMed: 21046186
DOI: 10.1007/s00775-010-0721-3
PDB entries with the same primary citation
Experimental method
SOLUTION NMR
Structure validation

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