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A 54,719 bp fragment from the right arm of Saccharomyces cerevisiae chromosome XV has been sequenced from the inserts of two cosmids (pEOA213 and pEOA217). The computer analysis of this sequence has revealed the presence of eight known genes (CKA2, CYC1, ALG8, TCM1, TMP1, UFE1, RTS2 and ASE1) and four open reading frames (ORFs) with strong homologies with known yeast genes (MLP1, SIS2 and HBS1 and the allantoin permease). The characteristics of the other ORFs and of the corresponding proteins do not allow postulation of a precise function. Several have features reminiscent of cytoskeleton or motor elements (keratin-like, myosin-like) and several others have characteristics of proteins which interact with DNA (extremely basic, b-Zip structure and/or acidic domains). Two tRNAs (tRNA(Lys) and tRNA(Pro)) have also been identified on this fragment. Many of these ORFs present similarities with ORFs located on chromosome XI, indicating some information reshuffling between the two chromosomal fragments.
Valens et al. (Sun,) studied this question.
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