title: The structure of hormaomycin and one of its all-peptide aza-analogues in solution: syntheses and biological activities of new hormaomycin analogues.
abstract: Four new aza-analogues of hormaomycin 1, a secondary metabolite with interesting biological activities produced by Streptomyces griseoflavus, were synthesized and subjected to preliminary tests of their antibiotic activity to provide new insights into the structure-activity relationship studies of this class of compounds. The solution structures of hormaomycin 1 and its aza-analogue 2 a were determined by NMR spectroscopy. The data exhibited a reasonably rigid conformation for both molecules, stabilized by stacking interactions between the aromatic moieties attached to the ring and the side chain. According to NMR-spectral data the aza-analogue epi-2 a has a rather different conformation and indeed shows no antibacterial activity whatsoever.
authors.affiliation: Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.
authors.forename: Uwe M
authors.initials: UM
authors.lastname: Reinscheid
authors.forename: Boris D
authors.initials: BD
authors.lastname: Zlatopolskiy
authors.forename: Christian
authors.initials: C
authors.lastname: Griesinger
authors.forename: Axel
authors.initials: A
authors.lastname: Zeeck
authors.forename: Armin
authors.initials: A
authors.lastname: de Meijere
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D001173:Arthrobacter / Q000187:drug effects; D001372:Aza Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D003500:Cyclization; D047630:Depsipeptides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D012996:Solutions; D013329:Structure-Activity Relationship; D010456:Peptides, Cyclic
chemical_list: D000900:Anti-Bacterial Agents; D001372:Aza Compounds; D047630:Depsipeptides; D012996:Solutions; C510371:hormaomycin; D010456:Peptides, Cyclic