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Nucleic Acids Research, 1992, Vol. 20, No. 20 5397-5402
© 1992

GENOME STRUCTURE AND MAPPING

A repetitive DNA sequence in Paramecium macronuclei is related to the ß subunit of G proteins

James Forney and Karyn Rodkey

Department of Biochemistry, Purdue University West Lafayette, IN 479079, USA

Received July 7, 1992. Revised September 17, 1992. Accepted September 17, 1992.

A repeated DNA sequence has been identified in the macronucleus of several Paramecium species. In P.tetraurelia the repeat was identified in the subtelomeric region of four randomly selected tetomere clones, as well as downstream of the A type variable surface protein gene. The complete sequence of the A gene linked repeat consists of 15 tandem repeats of exactly 126 nucleotides that contain an open reading frame with significant similarity to the ß subunits of trlmeric G proteins. The most striking consensus feature is the amlno acid sequence DX{Omega}WD where X is any amino acid and {Omega} is I, L, or V spaced at precise 42 amino acids intervals. This sequence and spacing are found in G-protein beta subunits and other members of this protein motif family. Analysis of the five cloned telomeric restriction fragments showed the repeats can be found In either orientation with respect to the telomere. Poly(A) RNA transcripts containing this sequence have been identified in Paramecium tetraurella. The conserved presence of this sequence in several species of Paramecium suggests an important physiological function, and the study of this repeat may reveal information about the evolution of this common protein motif.


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