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Mol Cell Biol, August 1998, p. 4589-4596, Vol. 18, No. 8
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Murine Adseverin (D5), a Novel Member of the Gelsolin Family, and Murine Adseverin Are Induced by Interleukin-9 in T-Helper Lymphocytes

Johan Robbens,1 Jamila Louahed,2 Kathleen De Pestel,1 Inge Van Colen,1 Christophe Ampe,1 Joel Vandekerckhove,1 * and Jean-Christophe Renauld2

V. I. B., Flanders Interuniversity Institute for Biotechnology and Department of Biochemistry, Faculty of Medicine, Universiteit Gent, B-9000 Gent,1 and Ludwig Institute for Cancer Research, Brussels Branch, and Experimental Medicine Unit, University of Louvain-in-Brussels B-1200 Brussels,2 Belgium

Received 6 November 1997/Returned for modification 30 January 1998/Accepted 12 May 1998

We identified a number of upregulated genes by differential screening of interleukin-9-stimulated T-helper lymphocytes. Interestingly, two of these messengers encode proteins that are similar to proteins of the gelsolin family. The first displays a typical structure of six homologous domains and shows a high level of identity (90%) with bovine adseverin (or scinderin) and may therefore be considered the murine adseverin homolog. The second encodes a protein with only five segments. Sequence comparison shows that most of the fifth segment and a short amino-terminal part of the sixth segment (amino acids 528 to 628 of adseverin) are missing, and thus, this form may represent an alternatively spliced product derived from the same gene. The corresponding protein is called mouse adseverin (D5). We expressed both proteins in Escherichia coli and show that mouse adseverin displays the typical characteristics of all members of the gelsolin family with respect to actin binding (capping, severing, and nucleation) and its regulation by Ca2+. In contrast, mouse adseverin (D5) fails to nucleate actin polymerization, although like mouse adseverin and gelsolin, it severs and caps actin filaments in a Ca2+-dependent manner. Adseverin is present in all of the tissues and most of the cell lines tested, although at low concentrations. Mouse adseverin (D5) was found only in blood cells and in cell lines derived from T-helper lymphocytes and mast cells, where it is weakly expressed. In a gel filtration experiment, we demonstrated that mouse adseverin forms a 1:2 complex with G actin which is stable only in the presence of Ca2+, while no stable complex was observed for mouse adseverin (D5).

* Corresponding author. Mailing address: V. I. B., Flanders Interuniversity Institute for Biotechnology and Department of Biochemistry, Faculty of Medicine, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium. Phone: 32-9-2645289. Fax: 32-9-2645337. E-mail: Johan.Robbens{at}rug.ac.be.

Mol Cell Biol, August 1998, p. 4589-4596, Vol. 18, No. 8
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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