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To update sequenced data, we determined the 5' and 3' termini of yeast Hansenula wingei (Pichia canadensis) mitochondrial (mt) large subunit ribosomal RNA (LSU) which is encoded in the mt genome. The 5' end position was mapped downstream from a putative transcription starting site which is homologous to a Saccharomyces cerevisiae mitochondrial promoter sequence. This suggests that the primary transcript of LSU is processed from 5' end and then mature transcript is formed. This processing is different from that of S. cerevisiae mt LSU in which processing on its 5' end does not occur. Based on the sequence data of H. wingei mt LSU, we constructed its secondary structure, and compared it with those of the other fungal organisms. Conserved regions of H. wingei LSU were identified and used for subsequent phylogenetic analysis. In genome structure and gene content, H. wingei mt genome has several characteristics similar to those in filamentous fungi, but the phylogenetic analysis indicates closer kinship to yeast S. cerevisiae. This agrees with previous non-sequencing phylogenies and suggests that extraordinary rearrangements have occurred in yeast mt genomes during divergent evolution.

Up-to-dating of complete sequenced DNA data of Hansenula wingei yeast mitochondria