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. 2015 Jun 1;5:10753. doi: 10.1038/srep10753

Figure 2. Structural conversions located beyond the loop in the molecular engineering to produce sitagliptin.

Figure 2

(a and b) Enlargement of the S pocket caused by the four mutations in the active sites. Stereo view of the surface is shown for Ab-R-ATA (a) and ATA-117-Rd11 (b) The locations of the four residues are shown in red and labeled. (c) Enlargement of the L pocket (semi-circle labeled L) caused by the mutation H62T. His62 (in the L pocket of Ab-R-ATA) was mutated to Thr, reducing its size and increasing the volume of the active site around it. The active site cavities of Ab-R-ATA (cyan) and ATA-117-Rd11 (yellow) are shown as mesh. The semi-circle-labeled S represents the enlarged S pocket mentioned in (b).