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https://doi.org/10.1371/journal.pone.0041924
Title: | Structure and binding interface of the cytosolic tails of ?x?2 integrin | Authors: | Chua G.-L. Tang X.-Y. Patra A.T. Tan S.-M. Bhattacharjya S. |
Keywords: | alpha integrin alpha10beta2 integrin unclassified drug article controlled study crystal structure micelle molecular docking molecular model nitrogen nuclear magnetic resonance protein binding protein conformation protein interaction proton nuclear magnetic resonance Amino Acid Sequence Cytosol Integrin alphaXbeta2 Models, Molecular Molecular Sequence Data Myristic Acid Nuclear Magnetic Resonance, Biomolecular Protein Binding Protein Modification, Translational Protein Structure, Tertiary |
Issue Date: | 2012 | Citation: | Chua G.-L., Tang X.-Y., Patra A.T., Tan S.-M., Bhattacharjya S. (2012). Structure and binding interface of the cytosolic tails of ?x?2 integrin. PLoS ONE 7 (7) : e41924. ScholarBank@NUS Repository. https://doi.org/10.1371/journal.pone.0041924 | Rights: | Attribution 4.0 International | Abstract: | Background: Integrins are signal transducer proteins involved in a number of vital physiological processes including cell adhesion, proliferation and migration. Integrin molecules are hetero-dimers composed of two distinct subunits, ? and ?. In humans, 18 ? and 8 ? subunits are combined into 24 different integrin molecules. Each of the subunit comprises a large extracellular domain, a single pass transmembrane segment and a cytosolic tail (CT). The CTs of integrins are vital for bidirectional signal transduction and in maintaining the resting state of the receptors. A large number of intracellular proteins have been found to interact with the CTs of integrins linking integrins to the cytoskeleton. Methodology/Principal Findings: In this work, we have investigated structure and interactions of CTs of the leukocyte specific integrin ?X?2. We determined the atomic resolution structure of a myristoylated CT of ?X in perdeuterated dodecylphosphocholine (DPC) by NMR spectroscopy. Our results reveal that the 35-residue long CT of ?X adopts an ?-helical conformation for residues F4-N17 at the N-terminal region. The remaining residues located at the C-terminal segment of ?X delineate a long loop of irregular conformations. A segment of the loop maintains packing interactions with the helical structure by an extended non-polar surface of the ?X CT. Interactions between ?X and ?2 CTs are demonstrated by 15N-1H HSQC NMR experiments. We find that residues constituting the polar face of the helical conformation of ?X are involved in interactions with the N-terminal residues of ?2 CT. A docked structure of the CT complex indicates that a network of polar and/or salt-bridge interactions may sustain the heteromeric interactions. Conclusions/Significance: The current study provides important insights into the conservation of interactions and structures among different CTs of integrins. © 2012 Chua et al. | Source Title: | PLoS ONE | URI: | https://scholarbank.nus.edu.sg/handle/10635/161969 | ISSN: | 19326203 | DOI: | 10.1371/journal.pone.0041924 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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