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Nucleic Acids Research, 1978, Vol. 5, No. 11 4451-4462
© 1978

Articles

Stacking of Crick Wobble pair and Watson-Crick pair: stability rules of G-U pairs at ends of helical stems in tRNAs and the relation to codon-anticodon Wobble interaction

H. Mizuno and M. Sundaralingam

Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin- Madison Madison, WI 53706, USA

Received July 17, 1978. The occurrence of the noncomplementary G–U base pair at the end of a helix is found to be governed by stacking interactions. As a rule, a G–U pair with G on the 5'-side of a Watson-Crick base pair exhibits strikingly greater stacking overlap with the Watson-Crick base pair than a G–U pair on the 3'-side of a Watson-Crick base pair. The former arrangement is expected to be more stable and indeed is observed 29 times out of 32 in the known transfer RNA molecules. In accordance with this rule, the major wobble base pairs G–U or I–U in codon-anticodon interactions have G or I on the 5'-side of the anticodon. Similarly, in initiator tRNAs, this rule is obeyed where now the G is the first letter of the codon (5'-side). In the situation where U is in the wobble position of the anticodon, it is usually substituted at C(5) and may also have a 2-thio group and it can read one to four codons depending on its modifications. A G at the wobble position of the anticodon can recognize the two codons ending with U or C and modification of G (unless it is I) does not change its reading properties.


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