NMR studies of the paramagnetic complex Fe(II)-bleomycin

Teresa E. Lehmann, Li June Ming, Mark E. Rosen, Larry Que

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

The coordination chemistry of the iron(II) complex of the antitumor drug bleomycin has been extensively investigated with a number of spectroscopic and chemical techniques. However, the actual structure of this complex is not established. In this report, we present NMR studies of the paramagnetic Fe(II)BLM and use one- and two-dimensional methods to assign the paramagnetically shifted features to particular protons. The data analysis points toward the primary and secondary amines of the β-aminoalanine fragment, the pyrimidine and imidazole rings, and the amide nitrogen of the β-hydroxyhistidine fragment as ligands to the metal center. Correlation of the T1 values with the metal-proton distances derived from the NMR-generated solution structure of HOO-Co(III)BLM [Wu, W., Vanderwall, D. E., Lui, S. M., Tang, X.-J., Turner, C. J., Kozarich, J. W., and Stubbe, J. (1996) J. Am. Chem. Soc. 118, 1268-1280] indicates that the two metallobleomycins share similar structures. The chemical shifts as well as the T1 values of the sugar protons indicate that these fragments are close but not bound to the metal in Fe(II)BLM.

Original languageEnglish (US)
Pages (from-to)2807-2816
Number of pages10
JournalBiochemistry
Volume36
Issue number10
DOIs
StatePublished - Mar 11 1997

Fingerprint Dive into the research topics of 'NMR studies of the paramagnetic complex Fe(II)-bleomycin'. Together they form a unique fingerprint.

Cite this