Ala28 and Ile84 make stronger vdw interactions with the Cβ of the P2 Asn compared to PRWT-SQV.
From observations of residues important for the horizontal hydrophobic sliding of the fulcrum against the 30's strand in PRWT-SQV, Leu33′ makes two vdw interactions with both Ile13′ (4.2 Å, 3.8 Å) and Ile15′ (4.4 Å) facilitating the 30's strand to slide over the 'teens strand.
One route is achieved by Ile64′ making a vdw interaction with Ile13′ which then makes a vdw contact with Ala22′.
Our molecular dynamics simulations indicate that saquinavir is more mobile in the active site of PRG48T/L89M-SQV PRG48T/L89M-SQVormation Figure Supporting Information Figurethat S4V makes less favorable vdw interacomparedito the active site residues Ile50, Phe53, Val82, Ile84, and Ala28′ of PRG48T/L89M-SQV compandd thatRWT-SQV (Supporting Informakesn Figure S6).
These movements enabled MEL5 residues αAla94 and βTyr49 to make two salt bridges and nine vdW interactions with MHC residue Arg65 (compared to one salt bridges and three vdW interactions for A2-ELA) and TCR residue βLeu98 to make five vdW contacts with MHC residues Ala69 and His70 (compared to none for A2-ELA) in the MEL5-A2-EAA complex (Fig. 3E and F).
Overall, MEL5 made three hydrogen bonds and four vdW interactions with EAA peptide residues Glu1 and Ala2, compared to only two vdW interactions with ELA peptide residues Glu1 and Leu2 (Fig. 3B and C).
Both graphene and hexagonal boron nitride (h-BN) flakes have a layered structure, with weak Van der Waals (vdW) interactions keeping the layers together but strong sp2 chemical bonds making atoms held together within each layer [1, 2].
Many encouraging approaches have been proposed to combine vdW interactions with standard approximate DFT calculations.
However, this work shows that multi-atom VdW interactions can become quite large in the presence of covalent bonds.
To take the weak van der Waals (vdW) interactions, we adopt Grimme's DFT-D2 vdW correction [22] based on a semi-empirical GGA-type theory.
