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  • Title: Hydrogen-bond motifs in the crystals of hydrophobic amino acids.
    Author: Fábián L, Chisholm JA, Galek PT, Motherwell WD, Feeder N.
    Journal: Acta Crystallogr B; 2008 Aug; 64(Pt 4):504-14. PubMed ID: 18641453.
    Abstract:
    A computer program has been developed to survey a set of crystal structures for hydrogen-bond motifs. Possible ring and chain motifs are generated automatically from a user-defined list of interacting molecular fragments and intermolecular interactions. The new program was used to analyse the hydrogen-bond networks in the crystals of 52 zwitterionic alpha-amino acids. All the possible chain motifs (repeating 1-4 molecules) are frequent, while the frequency of ring motifs (2-6 molecules) ranges from 0 to 85% of the structures. The list of motifs displayed by each structure reveals structural similarities and it can be used to compare polymorphs. The motifs formed in cocrystals of alpha-amino acids and in crystals of beta- and gamma-amino acids are similar to those of alpha-amino acids.
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