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Nucleic Acids Research, 1978, Vol. 5, No. 12 4523-4536
© 1978

Articles

Purification of pseudouridylate synthetase I from Salmonella typhimurium

Francesco Arena, Gennaro Ciliberto, Sofia Ciampi and Riccardo Cortese*

I Istituto di Chimica Biologica, II Facolta di Medicina e Chirurgia, Universita di Napoli Naples, Italy

Received October 31, 1978.

Pseudouridylate synthetase from Salmonella typhimurium has been purified 1000 fold and is about 90% pure. The enzyme has a molecular weight of 50.000 daltons. In the presence of tRNA there is a change in molecular weight from 50.000 to 100.000. This change does not seen to be due to the formation of a tRNA-enzyme complex but rather to a tRNA induced dimerization. Other properties of the enzyme are described.

*Present address: MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH UK


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