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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Beck, Moriah R. Vattepu, Ravi Yadav, Rahul |
| Description | Author Affiliation: Vattepu R ( Chemistry Department, Wichita State University, Wichita, Kansas, 67260.) |
| Abstract | A subset of actin binding proteins is able to form crosslinks between two or more actin filaments, thus producing structures of parallel or networked bundles. These actin crosslinking proteins interact with actin through either bivalent binding or dimerization. We recently identified two binding sites within the actin binding domain of palladin, an actin crosslinking protein that plays an important role in normal cell adhesion and motility during wound healing and embryonic development. In this study, we show that actin induces dimerization of palladin. Furthermore, the extent of dimerization reflects earlier comparisons of actin binding and bundling between different domains of palladin. On the basis of these results we hypothesized that actin binding may promote a conformational change that results in dimerization of palladin, which in turn may drive the crosslinking of actin filaments. The proximal distance between two actin binding sites on crosslinking proteins determines the ultrastructural properties of the filament network, therefore we also explored interdomain interactions using a combination of chemical crosslinking experiments and actin cosedimentation assays. Limited proteolysis data reveals that palladin is less susceptible to enzyme digestion after actin binding. Our results suggest that domain movements in palladin are necessary for interactions with actin and are induced by interactions with actin filaments. Accordingly, we put forth a model linking the structural changes to functional dynamics. |
| ISSN | 09618368 |
| e-ISSN | 1469896X |
| DOI | 10.1002/pro.2588 |
| Journal | Protein Science |
| Issue Number | 1 |
| Volume Number | 24 |
| Language | English |
| Publisher | Wiley-Blackwell (on behalf of The Protein Society) |
| Publisher Date | 2015-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Actins Metabolism Microfilament Proteins Actin Cytoskeleton Chemistry Phosphoproteins Protein Binding Protein Conformation Protein Multimerization Protein Structure, Tertiary Proteolysis Recombinant Proteins Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Molecular Biology Biochemistry |
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