Journal Article

Characterization of the <i>Arabidopsis</i> Formin-Like Protein AFH1 and Its Interacting Protein

Hiroharu Banno and Nam-Hai Chua

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 5, pages 617-626
Published in print May 2000 | ISSN: 0032-0781
Published online May 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/41.5.617
Characterization of the Arabidopsis Formin-Like Protein AFH1 and Its Interacting Protein

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A partial cDNA encoding an Arabidopsis thaliana FH (Formin Homology) protein (AFH1) was used as a probe to clone a full length AFH1 cDNA. The deduced protein encoded by the cDNA contains a FH1 domain rich in proline residues and a C-terminal FH2 domain which is highly conserved amongst FH proteins. In contrast to FH proteins of other organisms, the predicted AFH1 protein also contains a putative signal peptide and a transmembrane domain suggesting its association with membrane. Cell fractionation by differential centrifugation demonstrated the presence of AFH1 in the Triton X-100 insoluble microsomal fraction. An Arabidopsis cDNA library was screened to identify proteins that interact with the C-terminal region of AFH1 using yeast two-hybrid assays, and one of the isolated cDNAs encoded a novel protein, FIP2. Experiments using recombinant proteins expressed in E. coli demonstrated that FIP2 interacted directly with AFH1. The amino acid sequence of FIP2 has partial homology to bacterial putative membrane proteins and animal A-type K+ ATPases. AFH1 may form a membrane anchored complex with FIP2, which might be involved in the organization of the actin cytoskeleton.

Keywords: Actin; Cytoskeleton; FH protein; Membrane protein

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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