PMID: 8595880Feb 1, 1996Paper

Specificity of single LIM motifs in targeting and LIM/LIM interactions in situ

Genes & Development
S Arber, P Caroni

Abstract

The LIM motif defines a double zinc finger structure found in proteins involved in cell fate determination and growth control. LIM proteins, which include LIM homeo domain, LIM kinase, focal adhesion, and LIM-only proteins, usually contain two or more LIM motifs clustered at their amino- or carboxy-terminal end. At present, the mode of action of the LIM domain is not clear. In this study we have analyzed the binding properties of LIM motifs in the cellular environment. We show that MLP, CRP, and betaCRP define a subclass of LIM-only proteins with unique dual subcellular localization in the nucleus and along actin-based filaments in the cytosol. A double MLP construct that accumulated nearly exclusively along actin filaments promoted myogenic differentiation efficiently, arguing for a functional role of cytoskeleton-associated MLP. Binding of MLP to the actin cytoskeleton is specifically attributable to its second LIM motif. An additional LIM motif potentiates binding. Potentiating LIM motifs can be interchanged, resulting in differential targeting of interacting proteins. To analyze LIM-LIM interactions in situ, this property was exploited to develop a hybrid interaction approach based on the relocalization of LIM-containing co...Continue Reading

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