title: Theoretical elucidation of the origin for assembly of the DAP12 dimer with only one NKG2C in the lipid membrane.
abstract: In this work, we have investigated in details the origin of the assembly of the DAP12 dimer with only one NKG2C in the activating immunoreceptor complex from thew two aspects of electronic properties and dynamic structures by performing density functional theory (DFT) calculations and molecular dynamics (MD) simulations. In the DFT calculations, we studied the aggregation ability of the NKG2C(TM) with the DAP12(TM) dimer and the DAP12(TM)-DAP12(TM)-NKG2C(TM) complex by analyzing the electrostatic potentials and frontier molecular orbitals (FMOs), and in the MD simulations we mainly investigated the dynamic structures of the DAP12(TM)-DAP12(TM)-NKG2C(TM) complex and its mutants, as well as the tetramer complex consisting of two DAP12(TM) and two NKG2C(TM) helixes without any restriction. Through the studies of the electrostatic potential, the FMOs, and the dynamic structures, we have provided reasonable explanations to some extent for the experimental observation that only one NKG2C can associate with the DAP12 homodimer. The present theoretical results are expected to give valuable information for further studying the assembly between receptors and signaling subunits.
authors.affiliation: State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Rd., Dalian, 116023, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Sun
authors.forename: Huiying
authors.initials: H
authors.lastname: Chu
authors.forename: Ting
authors.initials: T
authors.lastname: Fu
authors.forename: Hujun
authors.initials: H
authors.lastname: Shen
authors.forename: Guohui
authors.initials: G
authors.lastname: Li
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry / Q000378:metabolism*; D019281:Dimerization; D006801:Humans; D008563:Membrane Lipids / Q000737:chemistry / Q000378:metabolism*; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism*; D056004:Molecular Dynamics Simulation; D055654:NK Cell Lectin-Like Receptor Subfamily C / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011789:Quantum Theory; D055672:Static Electricity
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D008563:Membrane Lipids; D008565:Membrane Proteins; D055654:NK Cell Lectin-Like Receptor Subfamily C; C110546:TYROBP protein, human