7KTV
Cryogenic electron microscopy model of full-length human metavinculin H1' kinked conformation
Summary for 7KTV
| Entry DOI | 10.2210/pdb7ktv/pdb |
| Related | 1TR2 |
| EMDB information | 23029 23030 23031 23032 |
| Descriptor | metavinculin (1 entity in total) |
| Functional Keywords | actin, adaptor protein, cadherin, cancer, catenin, cell adhesion, cell junction, cell migration, cell signaling, focal adhesions, heart failure, inositol phospholipid, integrin, plasma membrane, skeletal muscle, smooth muscle |
| Biological source | Homo sapiens (Human) |
| Total number of polymer chains | 1 |
| Total formula weight | 125061.50 |
| Authors | Izard, T.,Rangarajan, E.S. (deposition date: 2020-11-24, release date: 2021-01-27, Last modification date: 2024-03-06) |
| Primary citation | Rangarajan, E.S.,Izard, T. The Cryogenic Electron Microscopy Structure of the Cell Adhesion Regulator Metavinculin Reveals an Isoform-Specific Kinked Helix in Its Cytoskeleton Binding Domain. Int J Mol Sci, 22:-, 2021 Cited by PubMed Abstract: Vinculin and its heart-specific splice variant metavinculin are key regulators of cell adhesion processes. These membrane-bound cytoskeletal proteins regulate the cell shape by binding to several other proteins at cell-cell and cell-matrix junctions. Vinculin and metavinculin link integrin adhesion molecules to the filamentous actin network. Loss of both proteins prevents cell adhesion and cell spreading and reduces the formation of stress fibers, focal adhesions, or lamellipodia extensions. The binding of talin at cell-matrix junctions or of α-catenin at cell-cell junctions activates vinculin and metavinculin by releasing their autoinhibitory head-tail interaction. Once activated, vinculin and metavinculin bind F-actin via their five-helix bundle tail domains. Unlike vinculin, metavinculin has a 68-amino-acid insertion before the second α-helix of this five-helix F-actin-binding domain. Here, we present the full-length cryogenic electron microscopy structure of metavinculin that captures the dynamics of its individual domains and unveiled a hallmark structural feature, namely a kinked isoform-specific α-helix in its F-actin-binding domain. Our identified conformational landscape of metavinculin suggests a structural priming mechanism that is consistent with the cell adhesion functions of metavinculin in response to mechanical and cellular cues. Our findings expand our understanding of metavinculin function in the heart with implications for the etiologies of cardiomyopathies. PubMed: 33440717DOI: 10.3390/ijms22020645 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (4.5 Å) |
Structure validation
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