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DISOclust, based on analysis of three-dimensional structure models, identifies disorder when residues change or are consistently missing.
Interestingly four cysteine variants either, missing one or more conserved cysteine residues, change in position of cysteines or having additional cysteines were identified in the present study.
These residues change as a protein evolves to satisfy modified functional constraints, while the basic biochemical mechanism and the overall three-dimensional fold remain unaltered.
Because these residues change from hydrophobic (E. coli) to polar (Salmonella), the distal portion of the ligand may be slightly different between the organisms.
A number of residues located within the thioredoxin-like domain found in all GSTs have key roles, and a structure-based sequence alignment illustrates where these residues change between the two major subgroups.
As shown in Figure 4B, reduction of all glutamate residues and all glutamate plus aspartate residues change the apparent p I value from 8.93 to 9.48 and 9.93, respectively.
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Mutation of these residues changed the dimensions of the channel, both enlarging and constricting it, and also changed the solvent occupancy in the hydrophobic, inner section of the main channel.
The collective motions of the active site revealed that the mechanism of TfCel5A substrate binding can likely be described by the conformational-selection model; however, we observed that the conformations of active site residues changed differently along with substrate binding.
However, variants with either of the Asp residues changed to Glu remained soluble in an aqueous environment and inserted into the membrane at acidic pH with a higher pKapp of membrane insertion.
The phosphorylation status of several of these residues changes according to the time of the day and regulates period length.
Although nucleotide divergences were observed during sequencing, these do not give rise to amino acid residues changes (Figure 4C).
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