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Science 7 September 1984:
Vol. 225. no. 4666, pp. 1043 - 1046
DOI: 10.1126/science.225.4666.1043
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Articles

Cadmium-Resistant Pseudomonas putida Synthesizes Novel Cadmium Proteins

DENISE P. HIGHAM 1, PETER J. SADLER 1, and MICHAEL D. SCAWEN 2

1 Department of Chemistry, Birkbeck College, University of London, London WC1E 7HX, United Kingdom
2 Microbial Technology Laboratory, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire, SP4 0JG, United Kingdom

Three cysteine-rich proteins of molecular weight 4000 to 7000, containing 4 to 7 gram atoms of cadmium, zinc, and copper per mole were isolated from Pseudomonas putida growing in 3 mM cadmium. The three proteins were induced during different phases of growth, and the smallest (molecular weight 3600; 3 gram atoms of cadmium) was released into the medium when the cells lysed. The results of amino acid analyses and of ultraviolet, circular dichroism, electron paramagnetic resonance, and cadmium-113 nuclear magnetic resonance spectroscopy suggest a novel cadmium(II)-zinc(II)-copper(I) cluster structure for the major protein.

Submitted on February 21, 1984
Accepted on June 15, 1984


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