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Figure 4
Views of protofibrils of L-GSTSTA (a) and racemic GSTSTA (b) represented by a pair of sheets with a view down the protofibril axis; both structures were derived by MicroED. A 90° rotation shows a side view of the protofibril with strands stacked along each sheet in an antiparallel fashion. Another 90° rotation shows a side view of the protofibril along the strand axis, showing a buckling of each sheet owing to the tilting of strands away from or towards the protofibril axis. Chains are colored such that blue represents L-peptides while magenta represents D-peptides. Lighter and darker shades of each color differentiate the orientations of strands within a sheet. Ordered waters found in each asymmetric unit are indicated by colored squares that correspond to the insets of matching colors. The insets show magnified views of each water molecule, with hydrogen bonds represented by yellow dashed lines and labeled with their corresponding distances in Å.

IUCrJ
Volume 6| Part 2| March 2019| Pages 197-205
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518017621