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2k3s

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Revision as of 04:50, 11 September 2015

HADDOCK-derived structure of the CH-domain of the smoothelin-like 1 complexed with the C-domain of apocalmodulin

Structural highlights

2k3s is a 2 chain structure with sequence from Mus musculus and Xenopus laevis. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	2jv9, 1f71
Gene:	Smtnl1 (Mus musculus), calm1 (Xenopus laevis)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[SMTL1_MOUSE] Plays a role in the regulation of contractile properties of both striated and smooth muscles. When unphosphorylated, may inhibit myosin dephosphorylation. Phosphorylation at Ser-301 reduces this inhibitory activity.^[1] ^[2] [CALM_XENLA] Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The SMTNL1 protein contains a single type-2 calponin homology (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 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 alpha-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-terminal 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 SMTNL1.

Solution structure of the calponin homology (CH) domain from the smoothelin-like 1 protein: a unique apocalmodulin-binding mode and the possible role of the C-terminal type-2 CH-domain in smooth muscle relaxation.,Ishida H, Borman MA, Ostrander J, Vogel HJ, MacDonald JA J Biol Chem. 2008 Jul 18;283(29):20569-78. Epub 2008 May 12. PMID:18477568^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Wooldridge AA, Fortner CN, Lontay B, Akimoto T, Neppl RL, Facemire C, Datto MB, Kwon A, McCook E, Li P, Wang S, Thresher RJ, Miller SE, Perriard JC, Gavin TP, Hickner RC, Coffman TM, Somlyo AV, Yan Z, Haystead TA. Deletion of the protein kinase A/protein kinase G target SMTNL1 promotes an exercise-adapted phenotype in vascular smooth muscle. J Biol Chem. 2008 Apr 25;283(17):11850-9. doi: 10.1074/jbc.M708628200. Epub 2008 , Feb 29. PMID:18310078 doi:http://dx.doi.org/10.1074/jbc.M708628200
↑ Lontay B, Bodoor K, Weitzel DH, Loiselle D, Fortner C, Lengyel S, Zheng D, Devente J, Hickner R, Haystead TA. Smoothelin-like 1 protein regulates myosin phosphatase-targeting subunit 1 expression during sexual development and pregnancy. J Biol Chem. 2010 Sep 17;285(38):29357-66. doi: 10.1074/jbc.M110.143966. Epub, 2010 Jul 15. PMID:20634291 doi:http://dx.doi.org/10.1074/jbc.M110.143966
↑ Ishida H, Borman MA, Ostrander J, Vogel HJ, MacDonald JA. Solution structure of the calponin homology (CH) domain from the smoothelin-like 1 protein: a unique apocalmodulin-binding mode and the possible role of the C-terminal type-2 CH-domain in smooth muscle relaxation. J Biol Chem. 2008 Jul 18;283(29):20569-78. Epub 2008 May 12. PMID:18477568 doi:10.1074/jbc.M800627200

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2k3s"

@@ Line 5: / Line 5: @@
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2jv9|2jv9]], [[1f71|1f71]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Smtnl1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 Mus musculus]), calm1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=8355 Xenopus laevis])</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2k3s FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k3s OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2k3s RCSB], [http://www.ebi.ac.uk/pdbsum/2k3s PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2k3s FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k3s OCA], [http://pdbe.org/2k3s PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2k3s RCSB], [http://www.ebi.ac.uk/pdbsum/2k3s PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 27: / Line 27: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2k3s" style="background-color:#fffaf0;"></div>
 ==See Also==

2k3s

From Proteopedia

Revision as of 04:50, 11 September 2015

HADDOCK-derived structure of the CH-domain of the smoothelin-like 1 complexed with the C-domain of apocalmodulin

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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