Please use this identifier to cite or link to this item: 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
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