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Nucleic Acids Research, 1982, Vol. 10, No. 24 8297-8305
© 1982

CHEMISTRY

Nuclear Overhauser effect study of yeast tRNA Val 1: evidence for uridine-pseudouridine base pairing

Eyal Schejter*, Siddhartha Roy, Valentina Sánchez+ and Alfred G. Redfield§

Department of Biochemistry, Brandeis University Waltham, MA 02254, USA

§To whom correspondence should be addressed. Also at the Physics Department and the Rosenstiel Basic Medical Sciences Research Center, Brandeis University.

Received August 24, 1982. Accepted November 19, 1982.

The proton NMR spectrum of yeast tRNAVal 1 has been studied using nuclear Overhauser effect (NOE), including comparison of NOE patterns between purine C8 deuterated and nondeuterated samples. Studies of the downfield region enable us to reliably assign many resonances in the acceptor and D stems. Prominent among these reliable assignments is that of the unusual base pair U{chi}, which is made here for the first time. Other identifications include GU2, U8-A14, the three AU base pairs of the acceptor stem, and N1 and N3 protons of {chi}55.

*Present address: Department of Biophysics, The Weizman Institiute, Rehovoth Israel

+Present address: Centro de Biologia Molecular del C.S.I.C., Facultad de Ciencias, Universided Autonoma, Cantoblanco, Madrid-34, Spain.


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