1al4 | pdb_00001al4

GRAMICIDIN D FROM BACILLUS BREVIS (N-PROPANOL SOLVATE)

spinqualitylabelsall models 1al4, resolution 1.13Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1al4 is a 2 chain structure with sequence from Brevibacillus brevis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.13Å Ligands: DLE, DVA, ETA, FVA, POL, PRD_000152, QIL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The linear pentadecapeptide antibiotic gramicidin D is a heterogeneous mixture of six components. Precise refinements of three-dimensional structures of naturally occurring gramicidin D in crystals obtained from methanol, ethanol, and n-propanol demonstrate the unexpected presence of stable left-handed antiparallel double-helical heterodimers that vary with the crystallization solvent. The side chains of Trp residues in the three structures exhibit sequence-specific patterns of conformational preference. Tyr substitution for Trp at position 11 appears to favor beta ribbon formation and stabilization of the antiparallel double helix that acts as a template for gramicidin folding and nucleation of different crystal forms. The fact that a minor component in a heterogeneous mixture influences aggregation and crystal nucleation has potential applications to other systems in which anomalous behavior is exhibited by aggregation of apparently homogeneous materials, such as the enigmatic behavior of prion proteins. Heterodimer formation and crystal nucleation of gramicidin D.,Burkhart BM, Gassman RM, Langs DA, Pangborn WA, Duax WL Biophys J. 1998 Nov;75(5):2135-46. PMID:9788907 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Gramicidin

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