1vs2 | pdb_00001vs2
Interactions of quinoxaline antibiotic and DNA: the molecular structure of a TRIOSTIN A-D(GCGTACGC) complex
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Overview
The crystal structure of a DNA octamer d(GCGTACGC) complexed to an, antitumor antibiotic, triostin A, has been solved and refined to 2.2 A, resolution by x-ray diffraction analysis. The antibiotic molecule acts as, a true bis intercalator surrounding the d(CpG) sequence at either end of, the unwound right-handed DNA double helix. As previously observed in the, structure of triostin A-d(CGTACG) complex (A.H.-J. Wang, et. al., Science, 225, 1115-1121 (1984)), the alanine amino acid residues of the drug, molecule form sequence-specific hydrogen bonds to guanines in the minor, groove. The two central A.T base pairs are in Hoogsteen configuration with, adenine in the syn conformation. In addition, the two terminal G.C base, pairs flanking the quinoxaline rings are also held together by Hoogsteen, base pairing. This is the first observation in an oligonucleotide of., Hoogsteen G.C base pairs where the cytosine is protonated. The principal, functional components of a bis-intercalative compound are discussed.
About this Structure
1VS2 is a Protein complex structure of sequences from [1] with QUI, NCY, MVA, SER and ALA as ligands. Full crystallographic information is available from OCA.
Reference
Interactions of quinoxaline antibiotic and DNA: the molecular structure of a triostin A-d(GCGTACGC) complex., Wang AH, Ughetto G, Quigley GJ, Rich A, J Biomol Struct Dyn. 1986 Dec;4(3):319-42. PMID:3271447
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