title: Structural and conformational features relevant to the anti-tumor activity of calicheamicin γ 1I.
abstract: The structural and conformational features of the potent 10-membered enediyne-containing calicheamicin γ 1I that account for its remarkable DNA site-specific binding and cleavage are reviewed. A variety of spectroscopic and biophysical techniques were used to gain insight into the binding and stereospecific DNA cleavage of this potent antitumor agent. These include gel-shift cleavage assays, atom transfer NMR experiments, drug-DNA conformational studies, circular dichroism, and capillary electrophoresis. Computational descriptions are described for the DNA binding and cleavage of calicheamicin and its activated transient intermediates based on density functional and molecular mechanics calculations. In addition, the structure and clinical utility of calicheamicin immunoconjugates for antibody-targeted chemotherapy is presented.
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA. gae2104@columbia.edu
authors.forename: George A
authors.initials: GA
authors.lastname: Ellestad
mesh_terms: D000617:Aminoglycosides / Q000032:analysis / Q000737:chemistry* / Q000494:pharmacology; D000903:Antibiotics, Antineoplastic / Q000737:chemistry* / Q000494:pharmacology; D001665:Binding Sites; D002942:Circular Dichroism / Q000379:methods; D004247:DNA / Q000032:analysis / Q000737:chemistry*; D024202:Electrophoretic Mobility Shift Assay; D053281:Enediynes / Q000032:analysis / Q000737:chemistry* / Q000494:pharmacology; D006801:Humans; D018796:Immunoconjugates / Q000627:therapeutic use; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D009690:Nucleic Acid Conformation; D009844:Oligosaccharides / Q000032:analysis / Q000737:chemistry*
chemical_list: D000617:Aminoglycosides; D000903:Antibiotics, Antineoplastic; D053281:Enediynes; D018796:Immunoconjugates; D009844:Oligosaccharides; C055955:calicheamicin gamma(1)I; D004247:DNA