Nucleic Acids Research, Vol 25, Issue 3 455-458, Copyright © 1997 by Oxford University Press
E Rosato, A Trevisan, F Sandrelli, M Zordan, CP Kyriacou and R Costa
We have sequenced genomic fragments which encode the N-terminus of the
TIMELESS (TIM) clock protein in Drosophila simulans and D. yakuba. We
observe that in these two species, the initiating methionine appears to lie
downstream of the one proposed to encode the translational start
inD.melanogaster, thereby truncating the N-terminus by 23 amino acids. We
then sequenced the corresponding 5'fragment in a number of D. melanogaster
individuals from different strains. We observed a polymorphism which
strongly suggests that the originally proposed start site cannot be
utilised in some individuals, and that these flies will initiate
translation of TIM at the downstream ATG. Given the current interest in TIM
regulation in D. melanogaster, it is important to correctly define the
N-terminus in this species.
ARTICLES
Conceptual translation of timeless reveals alternative initiating methionines in Drosophila
Department of Genetics, University of Leicester, Leicester LE1 7RH, UK.
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