Crystal structure and site-directed mutagenesis of a bleomycin resistance protein and their significance for drug sequestering.Dumas, P., Bergdoll, M., Cagnon, C., Masson, J.M.
(1994) EMBO J. 13: 2483-2492
- PubMed: 7516875
- PubMed Abstract:
- All in the Family: Structural and Evolutionary Relationships Among Three Modular Proteins with Functions and Variable Assembly
Bergdoll, M.,Eltis, L.D.,Cameron, A.D.,Dumas, P.,Bolin, J.T.
(1998) Protein Sci. 7: 1661
- Crystallization and Preliminary X-Ray Data of a Phleomycin-Binding Protein from Streptoalloteichus Hindistanus
Rondeau, J.M.,Cagnon, C.,Moras, D.,Masson, J.M.
(1989) Embo J. 207: 645
- Bleomycin Resistance Conferred by a Drug-Binding Protein
Gatignol, A.,Durand, H.,Tiraby, G.
(1988) FEBS Lett. 230: 171
The antibiotic bleomycin, a strong DNA cutting agent, is naturally produced by actinomycetes which have developed a resistance mechanism against such a lethal compound. The crystal structure, at 2.3 A resolution, of a bleomycin resistance protein of ...
The antibiotic bleomycin, a strong DNA cutting agent, is naturally produced by actinomycetes which have developed a resistance mechanism against such a lethal compound. The crystal structure, at 2.3 A resolution, of a bleomycin resistance protein of 14 kDa reveals a structure in two halves with the same alpha/beta fold despite no sequence similarity. The crystal packing shows compact dimers with a hydrophobic interface and involved in mutual chain exchange. Two independent solution studies (analytical centrifugation and light scattering) showed that this dimeric form is not a packing artefact but is indeed the functional one. Furthermore, light scattering also showed that one dimer binds two antibiotic molecules as expected. A crevice located at the dimer interface, as well as the results of a site-directed mutagenesis study, led to a model wherein two bleomycin molecules are completely sequestered by one dimer. This provides a novel insight into antibiotic resistance due to drug sequestering, and probably also into drug transport and excretion.
Laboratoire de Biologie Structurale, CNRS, Strasbourg, France.