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| {{STRUCTURE_2jv9| PDB=2jv9 | SCENE= }} | | {{STRUCTURE_2jv9| PDB=2jv9 | SCENE= }} |
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| '''The Solution Structure of Calponin Homology Domain from Smoothelin-like 1'''
| | ===The Solution Structure of Calponin Homology Domain from Smoothelin-like 1=== |
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| ==Overview==
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| The smoothelin-like 1 protein (SMTNL1) is a recently discovered component of smooth muscle tissues [Borman M. A., MacDonald J. A., and Haystead T. A. J., (2004) FEBS Lett. 573, 207-213]. This 459-residue protein contains a single type-2 CH-domain at its C-terminus that shares sequence identity with the smoothelin family of smooth muscle specific proteins. In contrast to the smoothelins, SMTNL1 does not associate with F-actin in vitro, and although it is known to become phosphorylated during cGMP-mediated Ca(2+)-desensitization and relaxation, its specific role in smooth muscle remains unclear. In addition, the biological function of the C-terminal CH-domains found in the smoothelin proteins is also poorly understood. In this work, we have therefore determined the solution structure of the CH-domain of mouse SMTNL1 (SMTNL1-CH; residues 346-459). The secondary structure and the overall fold for the C-terminal type-2 CH-domain is very similar to that of other CH-domains. However, two clusters of basic residues form a unique surface structure that is characteristic of SMTNL1-CH. Moreover, the protein has an extended C-terminal a-helix, which contains a calmodulin (CaM)-binding IQ-motif, that is also a distinct feature of the smoothelins. We have characterized the binding of apo-CaM to SMTNL1-CH through its IQ-motif by isothermal titration calorimetry and NMR chemical shift perturbation studies. In addition, we have used the HADDOCK protein-protein docking approach to construct a model for the complex of apo-CaM and SMTNL1-CH. The model revealed a close interaction of SMTNL1-CH with the two Ca(2+)-binding loop regions of the C-domain of apo-CaM; this mode of apo-CaM binding is distinct from previously reported interactions of apo-CaM with IQ-motifs. Finally, we comment on the putative role of the CH-domain in the biological function of the SMTNL1 protein. | | The line below this paragraph, {{ABSTRACT_PUBMED_18477568}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 18477568 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_18477568}} |
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| ==About this Structure== | | ==About this Structure== |
| 2JV9 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JV9 OCA]. | | 2JV9 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JV9 OCA]. |
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| ==Reference== | | ==Reference== |
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| [[Category: Smoothelin-like 1]] | | [[Category: Smoothelin-like 1]] |
| [[Category: Structural protein]] | | [[Category: Structural protein]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed May 28 09:12:07 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:41:45 2008'' |
