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Smad proteins physically interact with calmodulin

C M Zimmerman¹, M S Kariapper, L S Mathews

¹Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109-0606, USA.

The Journal of Biological Chemistry

|February 14, 1998

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Smad proteins, crucial for cell signaling, directly bind to calmodulin in a calcium-dependent manner. This interaction, involving conserved N-terminal residues, suggests calmodulin regulates Smad protein function in cellular pathways.

Area of Science:

Molecular Biology
Cell Signaling

Background:

Smad proteins mediate signals from activin and TGF-β via receptor serine kinases.
xSmad2 is an identified mediator of activin signals involved in transcriptional regulation.

Purpose of the Study:

To identify proteins that bind to xSmad2 using an interaction cloning strategy.
To investigate the role of calmodulin in Smad protein signaling.

Main Methods:

Interaction cloning to identify xSmad2-binding proteins.
In vitro translation and COS cell overexpression to generate xSmad2.
Calmodulin-agarose binding assays.
Reporter gene assays using 3TP-Lux to measure transcriptional activity.

Main Results:

Related Experiment Videos

Calmodulin was identified as a direct binding partner of Smad proteins.
xSmad2 binding to calmodulin was calcium-dependent and required N-terminal residues.
xSmad1 and human Smads (2, 3, 4) also bound to calmodulin.
A calmodulin antagonist increased activin-inducible reporter expression, while calmodulin overexpression suppressed it.

Conclusions:

Smad proteins interact with calmodulin via a calcium-dependent mechanism involving conserved N-terminal amino acids.
Calmodulin plays a regulatory role in Smad protein function and downstream signaling pathways.