l-Methionyl-l-alanine: a dipeptide with hexagonal symmetry and Z′ = 7

Görbitz, C.H.

doi:10.1107/S0108270103019280

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 2
The crystal packing of MA

viewed along the c axis. Side chains are shown in light grey. The letters A–G identify the seven independent peptide molecules in the asymmetric unit, which are shown in more detail in the right-hand diagram, along with two additional G molecules, viz. G* [at symmetry position (1 − x, 1 + x − y, z − $[{2 \over 3}]$ )] and G# [at symmetry position (y − x, 1 − x, z − $[{1 \over 3}]$ )]. Two unit cells are shown; the larger is the true unit cell, while the smaller is the subcell found in the earlier investigation of an MA

crystal. The latter also corresponds to the true unit cell in the VA class. Note that the illustration does not tell the full story about column 1, since the extended A3 conformation (see Table 1

) for L-Met is shown for all A molecules. This side chain is, in fact, disordered over six positions.

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 59| Part 10| September 2003| Pages o589-o592

doi:10.1107/S0108270103019280

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