|Journal of Biological Chemistry (2004) 279(30):31697-707|
|New York Structural Genomics Research Consortium|
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Actin-interacting protein 1 (AIP1) is a WD40 repeat protein that enhances actin filament disassembly in the presence of actin-depolymerizing factor (ADF)/cofilin. ...
AIP1 also caps the barbed end of ADF/cofilin-bound actin filament. However, the mechanism by which AIP1 interacts with ADF/cofilin and actin is not clearly understood. We determined the crystal structure of Caenorhabditis elegans AIP1 (UNC-78), which revealed 14 WD40 modules arranged in two seven-bladed beta-propeller domains. The structure allowed for the mapping of conserved surface residues, and mutagenesis studies identified five residues that affected the ADF/cofilin-dependent actin filament disassembly activity. Mutations of these residues, which reside in blades 3 and 4 in the N-terminal propeller domain, had significant effects on the disassembly activity but did not alter the barbed end capping activity. These data support a model in which this conserved surface of AIP1 plays a direct role in enhancing fragmentation/depolymerization of ADF/cofilin-bound actin filaments but not in barbed end capping.
|metabolism chemistry genetics |
|Binding Sites Crystallography, X-Ray Animals Models, Molecular Protein Conformation Static Electricity Base Sequence Recombinant Fusion Proteins Amino Acid Substitution Mutagenesis, Site-Directed Thermodynamics DNA Primers Actins Caenorhabditis elegans Caenorhabditis elegans Proteins Actin Depolymerizing Factors Microfilament Proteins Destrin Rabbits |
|60 (Last update: 10/13/2018 2:05:31pm)|
|J Biol Chem. 2004 Jul 23;279(30):31697-707. Epub 2004 May 18.|