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2015 ; 33
(1
): 14-27
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Molecular recognition mechanism of peptide chain bound to the tRNA(Lys3)
anticodon loop in silico
#MMPMID24417415
Xiao X
; Agris PF
; Hall CK
J Biomol Struct Dyn
2015[]; 33
(1
): 14-27
PMID24417415
show ga
The mechanism by which proteins recognize and bind the post-transcriptional
modifications of RNAs is unknown, yet these interactions play important functions
in biology. Atomistic molecular dynamics simulations were performed to examine
the folding of the model peptide chain -RVTHHAFLGAHRTVG- and the complex formed
by the folded peptide with the native anticodon stem and loop of the human
tRNA(Lys3) (hASL(Lys3)) in order to explore the binding mechanism. By analyzing
and comparing two folded conformations of this peptide obtained from the folding
simulation, we found that the van der Waals (VDW) energy is necessary for the
thermal stability of the peptide, and the charge-charge (ELE?+?EGB) energy is
crucial for determining the three-dimensional folded structure of the peptide
backbone. Subsequently, two conformations of the peptide were employed to
investigate their binding behaviors to hASL(Lys3). The metastable folded peptide
was found to bind to hASL(Lys3) much easier than the stable folded peptide in the
binding simulations. An energetic analysis reveals that the VDW energy favors the
binding, whereas the ELE?+?EGB energies disfavor the binding. Arginines on the
peptide preferentially attract the phosphate backbone via the inter-chain
ELE?+?EGB interaction, significantly contributing to the binding affinity. The
hydrophobic phenylalanine interacts with the anticodon loop of hASL(Lys3) via the
inter-chain VDW interaction, significantly contributing to the binding
specificity.