1xyd
From Proteopedia
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|PDB= 1xyd |SIZE=350|CAPTION= <scene name='initialview01'>1xyd</scene> | |PDB= 1xyd |SIZE=350|CAPTION= <scene name='initialview01'>1xyd</scene> | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene> | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= S100b ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Rattus norvegicus]) | |GENE= S100b ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Rattus norvegicus]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1qlk|1QLK]], [[1b4c|1B4C]], [[1dt7|1DT7]], [[1mwn|1MWN]], [[3psr|3PSR]], [[1odb|1ODB]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1xyd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xyd OCA], [http://www.ebi.ac.uk/pdbsum/1xyd PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1xyd RCSB]</span> | ||
}} | }} | ||
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[[Category: Weber, D J.]] | [[Category: Weber, D J.]] | ||
[[Category: Wilder, P T.]] | [[Category: Wilder, P T.]] | ||
| - | [[Category: CA]] | ||
| - | [[Category: ZN]] | ||
[[Category: metal binding protein]] | [[Category: metal binding protein]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 00:56:21 2008'' |
Revision as of 21:56, 30 March 2008
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| Ligands: | , | ||||||
| Gene: | S100b (Rattus norvegicus) | ||||||
| Related: | 1QLK, 1B4C, 1DT7, 1MWN, 3PSR, 1ODB
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
NMR Solution Structure of Rat Zinc-Calcium-S100B, 20 Structures
Overview
The EF-hand calcium-binding protein S100B also binds one zinc ion per subunit with a relatively high affinity (K(d) approximately 90 nM) [Wilder et al., (2003) Biochemistry 42, 13410-13421]. In this study, the structural characterization of zinc binding to calcium-loaded S100B was examined using high-resolution NMR techniques, including structural characterization of this complex in solution at atomic resolution. As with other S100 protein structures, the quaternary structure of Zn(2+)-Ca(2+)-bound S100B was found to be dimeric with helices H1, H1', H4, and H4' forming an X-type four-helix bundle at the dimer interface. NMR data together with mutational analyses are consistent with Zn(2+) coordination arising from His-15 and His-25 of one S100B subunit and from His-85 and Glu-89 of the other subunit. The addition of Zn(2+) was also found to extend helices H4 and H4' three to four residues similar to what was previously observed with the binding of target proteins to S100B. Furthermore, a kink in helix 4 was observed in Zn(2+)-Ca(2+)-bound S100B that is not in Ca(2+)-bound S100B. These structural changes upon Zn(2+)-binding could explain the 5-fold increase in affinity that Zn(2+)-Ca(2+)-bound S100B has for peptide targets such as the TRTK peptide versus Ca(2+)-bound S100B. There are also changes in the relative positioning of the two EF-hand calcium-binding domains and the respective helices comprising these EF-hands. Changes in conformation such as these could contribute to the order of magnitude higher affinity that S100B has for calcium in the presence of Zn(2+).
About this Structure
1XYD is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
Reference
Solution structure of zinc- and calcium-bound rat S100B as determined by nuclear magnetic resonance spectroscopy., Wilder PT, Varney KM, Weiss MB, Gitti RK, Weber DJ, Biochemistry. 2005 Apr 19;44(15):5690-702. PMID:15823027
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