Several new NNRTIs incorporate flexibility in order to compensate for lost interactions with amino acid conferring mutations in RT.
The Q155N mutant quickly lost interactions with Asn195 and Ala194 at the helix 2 region, as indicated by the continuous increase in pairwise residue distances; however, the interactions between Asn155 and Glu159 were well conserved.
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Instead, CUL3Δ403 459 auto-ubiquitylates and loses interaction with two important Cullin regulators: the COP9-signalosome and CAND1.
Instead, CUL3Δ403 459 auto-ubiquitinates and loses interaction with two CUL3 regulators, namely the COP9-Signalosome and cullin-associated and neddylation-dissociated 1 (CAND1).
The sulphonamide, however, sits lower in the active site losing interaction with Asn434, and the pyrazole group rotates slightly to accommodate the larger moiety at the 3- position.
Melanoma cells must lose interactions with keratinocytes in order to invade the dermis.
Taken together these results indicate that the six broadly binding compounds along with earlier designs benefit from residing fully within the substrate envelope and thus decreasing the chance of losing interactions with a drug-resistant variant, rather than benefitting from an advantaged scaffold.
With the unpromoted catalyst, oxidation reduction cycles tended to have two effects: (1) a fraction of CoO species that lost their interaction with the support emerged and (2) a fraction of more strongly interacting CoO species was formed.
However, Ala62 completely lost the interaction with TP5 by its side chain oxygen which was replaced by the main-chain oxygen of Ala62 (Fig. 7C, D), suggesting that the interaction by the main chain weakened the binding affinity.
