385D

FORMATION OF A NEW COMPOUND IN THE CRYSTAL STRUCTURE OF CYANOMORPHOLINODOXORUBICIN COMPLEXED WITH D(CGATCG)

Summary for 385D

• Entry DOI: 10.2210/pdb385d/pdb
• Descriptor: DNA (5'-D(*CP*GP*AP*TP*CP*G)-3'), N-ETHYLHYDROXY-DOXORUBICIN (3 entities in total)
• Functional Keywords: right handed dna, double helix, complexed with drug, dna
• Total number of polymer chains: 1
• Total formula weight: 2396.79

Authors

Ettorre, A.,Cirilli, M.,Ughetto, G. (deposition date: 1998-03-05, release date: 1998-10-30, Last modification date: 2024-02-21)

Primary citation

Ettorre, A.,Cirilli, M.,Ughetto, G.
Degradation of the morpholino ring in the crystal structure of cyanomorpholinodoxorubicin complexed with d(CGATCG).
Eur.J.Biochem., 258:350-354, 1998

PubMed Abstract: The cyanomorpholino analogue of antitumor anthracycline doxorubicin possesses an intense potency and differs from the parent compound in cross-resistance and other biological properties. The induction by cyanomorpholinodoxorubicin of both DNA cross-links and strand scission suggests an altered mode of action relative to doxorubicin with a different DNA-interacting capacity. We have co-crystallized 3'-(3-cyano-4-morpholinyl)-3'-desaminodoxorubicin (CMD) with the DNA hexamer d(CGATCG) and have determined the crystal structure at 0.16-nm resolution. The complex crystallizes in the space group P4(1)2(1)2 and is similar to the previously reported anthracycline/DNA structures, with the drug intercalated at the CpG step, forming hydrogen bonds with the guanine residue. The structure reveals that the morpholino moiety has undergone a major rearrangement with loss of the cyano group and opening of the morpholino ring. The compound actually bound to DNA in the complex resembles N-(2-hydroxyethyl)doxorubicin, which was previously identified as a hydrolysis product of CMD. No DNA alkylation has been observed. However, the structure shows that the active site of the morpholino ring, after dissociation of the cyano group, lies in the minor groove in proximity of the A/T base pair. This may indicate that a C/G base pair next to the intercalation site, with NH2 group in the minor groove, is required for DNA alkylation.

PubMed: 9874199
DOI: 10.1046/j.1432-1327.1998.2580350.x

Experimental method

X-RAY DIFFRACTION (1.6 Å)