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Nucleic Acids Research, 1981, Vol. 9, No. 12 2961-2970
© 1981

MOLECULAR BIOLOGY

Structutal comparison of two yeast tRNAGlu3 genes

Antonin Eigel, Judith Olah+ and Horst Feldmann

Institut für Physiologische Chemie, Physikalische Biochemie und Zellbiologie der Univeisität München Goethestrasse 33, 8000 München 2, GFR

+Judith Olah's present address: Dept. Genet. and Cell Biol. Univ. Minn., 250 Biol. Sci. Center, St. Paul, Minn.55108, USA

Received March 12, 1981. DNA sequences in a 1.7 kb Pst fragment from yeast have been determined. This fragment is part of a yeast 7.4 kb Hind III segment cloned into pBR322 (pY 5) . The fragment carries a single gene for a glutamate tRNA. The coding portion of this gene is identical in sequence to that of the tRNAGlu3 gene from pY 20 [1]. The flanking regions differ in their sequences, but possible secondary structures within the 5'-flanking regions bear similar features. Sequence homologies between pY 5 and pY 20 were detected far outside the tRNA genes. More surprisingly, extended sequence homologies were seen between the flanking regions of the pY 20 tRNAGlu3 gene and a tRNASer gene [2,3]. We have also checked the known tRNA genes for structural similarities. Hybridization studies indicate that portions of the Pst fragment are repeated within the yeast genome.


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