1H NMR Studies on Bovine Cyclophilin: Preliminary Structural Characterization of This Specific Cyclosporin A Binding Protein

D. C. Dalgarno, I. M. Armitage, M. W. Harding, A. Lazarides, R. E. Handschumacher, I. M. Armitage

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Abstract

High-field 1H NMR spectroscopy has been used to study the conformation of the cytosolic cyclosporin A binding protein cyclophilin. For the drug-free form of cyclophilin, spectral editing methods in conjunction with a pH titration were used to identify all four His residues present in the protein, and two-dimensional COSY and RELAY spectroscopy was used to elucidate the scalar connectivities in the aromatic and upfield methyl regions of the spectrum. From these scalar connectivities, it was possible to distinguish between inter- and intraresidue dipolar interactions within the aromatic and upfield methyl regions of cyclophilin in the NOESY spectrum. The results of this analysis showed extensive interresidue crossrelaxation among and between these latter spectral regions indicative of the proximal relationships of several of these residues and the presence of a hydrophobic core within cyclophilin.

Original languageEnglish (US)
Pages (from-to)6778-6784
Number of pages7
JournalBiochemistry
Volume25
Issue number22
DOIs
StatePublished - Nov 1986

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    Dalgarno, D. C., Armitage, I. M., Harding, M. W., Lazarides, A., Handschumacher, R. E., & Armitage, I. M. (1986). 1H NMR Studies on Bovine Cyclophilin: Preliminary Structural Characterization of This Specific Cyclosporin A Binding Protein. Biochemistry, 25(22), 6778-6784. https://doi.org/10.1021/bi00370a008