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2018 ; 8
(1
): 9487
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Energy transport pathway in proteins: Insights from non-equilibrium molecular
dynamics with elastic network model
#MMPMID29934573
Wang WB
; Liang Y
; Zhang J
; Wu YD
; Du JJ
; Li QM
; Zhu JZ
; Su JG
Sci Rep
2018[Jun]; 8
(1
): 9487
PMID29934573
show ga
Intra-molecular energy transport between distant functional sites plays important
roles in allosterically regulating the biochemical activity of proteins. How to
identify the specific intra-molecular signaling pathway from protein tertiary
structure remains a challenging problem. In the present work, a non-equilibrium
dynamics method based on the elastic network model (ENM) was proposed to simulate
the energy propagation process and identify the specific signaling pathways
within proteins. In this method, a given residue was perturbed and the
propagation of energy was simulated by non-equilibrium dynamics in the normal
modes space of ENM. After that, the simulation results were transformed from the
normal modes space to the Cartesian coordinate space to identify the
intra-protein energy transduction pathways. The proposed method was applied to
myosin and the third PDZ domain (PDZ3) of PSD-95 as case studies. For myosin, two
signaling pathways were identified, which mediate the energy transductions form
the nucleotide binding site to the 50?kDa cleft and the converter subdomain,
respectively. For PDZ3, one specific signaling pathway was identified, through
which the intra-protein energy was transduced from ligand binding site to the
distant opposite side of the protein. It is also found that comparing with the
commonly used cross-correlation analysis method, the proposed method can identify
the anisotropic energy transduction pathways more effectively.