1mho
From Proteopedia
(New page: 200px<br /><applet load="1mho" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mho, resolution 2.0Å" /> '''THE 2.0 A STRUCTURE O...) |
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| - | [[Image:1mho.jpg|left|200px]]<br /><applet load="1mho" size=" | + | [[Image:1mho.jpg|left|200px]]<br /><applet load="1mho" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1mho, resolution 2.0Å" /> | caption="1mho, resolution 2.0Å" /> | ||
'''THE 2.0 A STRUCTURE OF HOLO S100B FROM BOVINE BRAIN'''<br /> | '''THE 2.0 A STRUCTURE OF HOLO S100B FROM BOVINE BRAIN'''<br /> | ||
==Overview== | ==Overview== | ||
| - | BACKGROUND. S100B (S100beta) is a member of the S100 family of small | + | BACKGROUND. S100B (S100beta) is a member of the S100 family of small calcium-binding proteins: members of this family contain two helix-loop-helix calcium-binding motifs and interact with a wide range of proteins involved mainly in the cytoskeleton and cell proliferation. S100B is a neurite-extension factor and levels of S100B are elevated in the brains of patients with Alzheimer's disease or Down's syndrome: the pattern of S100B overexpression in Alzheimer's disease correlates with the pattern of neuritic-plaque formation. Identification of a growing class of S100 proteins and the likely neurochemical importance of S100B make the determination of the structure of S100B of interest. RESULTS. We have used NMR to determine the structure of the reduced S100B homodimer in the absence of calcium. Each monomer consists of a four-helix bundle, arranged in the dimer in an antiparallel fashion. The fourth helix of each monomer runs close to the equivalent helix of the other monomer for almost its full length, extending the hydrophobic core through the interface. The N-terminal, but not the C-terminal, calcium-binding loop is similar to the equivalent loop in the monomeric S100 protein calbindin and is in a conformation ready to bind calcium. CONCLUSIONS. The novel dimer structure reported previously for calcyclin (S100A6) is the common fold for the dimeric S100B proteins. Calcium binding to the C-terminal calcium-binding loop would be expected to require a conformational change, which might provide a signal for activation. The structure suggests regions of the molecule likely to be involved in interactions with effector molecules. |
==About this Structure== | ==About this Structure== | ||
| - | 1MHO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1MHO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MHO OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Matsumura, H.]] | [[Category: Matsumura, H.]] | ||
[[Category: Shiba, T.]] | [[Category: Shiba, T.]] | ||
| - | [[Category: Yasushi, K | + | [[Category: Yasushi, K A.I.]] |
[[Category: CA]] | [[Category: CA]] | ||
[[Category: acetylation]] | [[Category: acetylation]] | ||
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[[Category: zinc]] | [[Category: zinc]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:55:17 2008'' |
Revision as of 11:55, 21 February 2008
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THE 2.0 A STRUCTURE OF HOLO S100B FROM BOVINE BRAIN
Overview
BACKGROUND. S100B (S100beta) is a member of the S100 family of small calcium-binding proteins: members of this family contain two helix-loop-helix calcium-binding motifs and interact with a wide range of proteins involved mainly in the cytoskeleton and cell proliferation. S100B is a neurite-extension factor and levels of S100B are elevated in the brains of patients with Alzheimer's disease or Down's syndrome: the pattern of S100B overexpression in Alzheimer's disease correlates with the pattern of neuritic-plaque formation. Identification of a growing class of S100 proteins and the likely neurochemical importance of S100B make the determination of the structure of S100B of interest. RESULTS. We have used NMR to determine the structure of the reduced S100B homodimer in the absence of calcium. Each monomer consists of a four-helix bundle, arranged in the dimer in an antiparallel fashion. The fourth helix of each monomer runs close to the equivalent helix of the other monomer for almost its full length, extending the hydrophobic core through the interface. The N-terminal, but not the C-terminal, calcium-binding loop is similar to the equivalent loop in the monomeric S100 protein calbindin and is in a conformation ready to bind calcium. CONCLUSIONS. The novel dimer structure reported previously for calcyclin (S100A6) is the common fold for the dimeric S100B proteins. Calcium binding to the C-terminal calcium-binding loop would be expected to require a conformational change, which might provide a signal for activation. The structure suggests regions of the molecule likely to be involved in interactions with effector molecules.
About this Structure
1MHO is a Single protein structure of sequence from Bos taurus with as ligand. Full crystallographic information is available from OCA.
Reference
The solution structure of the bovine S100B protein dimer in the calcium-free state., Kilby PM, Van Eldik LJ, Roberts GC, Structure. 1996 Sep 15;4(9):1041-52. PMID:8805590
Page seeded by OCA on Thu Feb 21 13:55:17 2008
Categories: Bos taurus | Single protein | Harada, S. | Inoue, T. | Matsumura, H. | Shiba, T. | Yasushi, K A.I. | CA | Acetylation | Calcium-binding | Metal-binding | Zinc
