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Scientific article
English

Biochemical evidence for interaction between smoothelin and filamentous actin

Contributors

Niessen, Petra; Clement, Sophie; Fontao, Lionel; Chaponnier, Christine; Teunissen, Birgit; Rensen, Sander; Van Eys, Guillaume; Gabbiani, Giulio

Published in

Experimental cell research, vol. 292, no. 1, p. 170-178

Publication date

2004

Abstract

The two major isoforms of smoothelin (A and B) contain a calponin homology (CH) domain, colocalize with alpha-smooth muscle actin (alpha-SMA) in stress fibers and are only expressed in contractile smooth muscle cells (SMCs). Based on these findings, we hypothesized that smoothelins are involved in smooth muscle cell contraction, presumably via interaction with actin. The interaction between smoothelins and three different actin isoforms (alpha- and gamma-smooth muscle and alpha-skeletal actin [alpha-SKA]) was investigated using several in vitro assays. Smoothelin-B co-immunoprecipitated with alpha-smooth muscle actin from pig aorta extracts. In rat embryonic fibroblasts, transfected smoothelins-A and -B associated with stress fibers. In vitro dot blot assays, in which immobilized actin was overlaid with radio-labeled smoothelin, showed binding of smoothelin-A to actin filaments, but not to monomeric G-actin. A truncated smoothelin, containing the calponin homology domain, associated with stress fibers when transfected and bound to actin filaments in overlay, but to a lesser extent. ELISA results showed that the binding of smoothelin to actin has no significant isoform specificity. Our results indicate an interaction between smoothelin and actin filaments. Moreover, the calponin homology domain and its surrounding sequences appear to be sufficient to accomplish this interaction, although the presence of other domains is apparently necessary to facilitate and/or strengthen the binding to actin.

Keywords

  • Actins/ metabolism
  • Animals
  • Aorta/chemistry
  • Calcium-Binding Proteins/metabolism
  • Cell Line
  • Cytoskeletal Proteins/chemistry/genetics/ metabolism
  • Enzyme-Linked Immunosorbent Assay
  • Escherichia coli/genetics
  • Fibroblasts/cytology/ metabolism
  • Glutathione Transferase/metabolism
  • Microfilament Proteins
  • Muscle Proteins
  • Precipitin Tests
  • Protein Isoforms/chemistry/genetics/ metabolism
  • Protein Structure, Tertiary
  • Rats/ embryology
  • Recombinant Fusion Proteins/metabolism
  • Stress Fibers/metabolism
  • Swine
  • Transfection

UNIGE affiliation entities

Citation (ISO format)

NIESSEN, Petra et al. Biochemical evidence for interaction between smoothelin and filamentous actin. In: Experimental cell research, 2004, vol. 292, n° 1, p. 170–178. doi: 10.1016/j.yexcr.2003.09.005

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Article

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Additional URL for this publication

http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WFC-49W6NNN-4-C&_cdi=6791&_user=779890&_pii=S0014482703004920&_orig=search&_coverDate=01%2F01%2F2004&_sk=997079998&view=c&wchp=dGLbVtz-zSkWb&md5=07fb72a337cab46a80411d98ab6890e5&ie=/sdarticle.pdf

Journal ISSN

0014-4827
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Technical informations

Creation

27/08/2010 13:35:41

First validation

27/08/2010 13:35:41

Update

14/03/2023 16:04:40

Status update

14/03/2023 16:04:40

Last indexation

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