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Figure 3
Crystal packing of L-Abu viewed along the b axis at (a) 110 K (Görbitz, 2010BB9), (b) 215 K and (c) 365 K. In (a) and (b) C atoms of molecules A, B, C and D are colored in sky blue, yellow, pink and white, respectively. In (c) molecule A (average of A and B at lower temperatures) is olive green, while molecule B (average of C and D at lower temperatures) is light pink. Only the most populated side-chain conformation is shown for disordered molecules. Colored arrows in (a) highlight what may look like a slide at the center of the green bilayer and the full actual slide of the red bilayer, while large open arrows cover two antiparallel hydrogen-bonded sheets that constitute a hydrophilic layer at the core of the two molecular bilayers identified by red and green shades. Dashed ellipses show hydrogen-bonded amino acid dimers. Symmetry elements are included in (b) and (c), with yellow fill for pseudo-twofold rotation axes, see text for details.

IUCrJ
Volume 3| Part 5| September 2016| Pages 341-353
ISSN: 2052-2525
doi:10.1107/S2052252516010472