Cas9-mediated mutations were identified through a fungicide resistance-based phenotypic screen, which selects for null mutations in the FgOs1 gene encoding an osmosensor histidine kinase.
Surface mutations are noticeably more selected against compared to the information-based approach, which is consistent with the explicit consideration of solvation in this model.
Destabilization can be achieved by introducing a packing mutation into the hydrophobic core of N. The role of the packing mutation, which is selected to be distant from the binding site, is to decrease the stability of N (i.e., lower Kunf) without compromising the intrinsic affinity (Ka) or specificity for the ligand.
Baker et al. (7) conducted mutagenesis studies in which selected mutations (e.g., D138A) in the orthosteric ligand binding domain disrupted both the high- and low-affinity binding conformation (7).
To avoid isolating facA mutations, a second screen was carried out using an areA217 facA700 double-mutant strain, which selected for mutations that cause loss of acetate repression of the amdS gene on 1% glycerol, 50 mM acetate, and 10 mM acetamide medium.
These mutations seem to be related to therapies for which selecting antiretroviral compounds is most challenging.
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From a purely intuitive point of view, this operator should give better results than random mutation, which consists in randomly selecting a channel of the solution and modify it on taking a new value of the channel at random [22].
Increased exposure to partially suppressive ARVs raises the risk of selecting resistance mutation, which may compromise the preferred regimen should the individual seroconvert.
The first apoc2 mutant we selected had a frame shift mutation, which led to the amino acid sequence change in its Lpl-binding domain (Fig. 1B,E).
