A ribosomal protein gene cluster is encoded in the mitochondrial DNA of Dictyostelium discoideum: UGA termination codons and similarity of gene order to Acanthamoeba castellanii.
We sequenced a region of about 14.5 kb downstream from the ribosomal protein L11 gene (rpl11) in the mitochondrial DNA (54+/-2 kb) of the cellular slime mold Dictyostelium discoideum. Sequence analysis revealed that eleven ribosomal protein genes and six open reading frames (ORFs) formed a cluster arranged in the order: rpl11-orf189-rps12-rps7-rpl2-rps19-+ ++orf425-orf1740-rpl16-rpl14-orf188- rps14-rps8-rpl6-rps13-orf127-orf796. This order was very similar to that of homologous genes in Acanthamoeba castellanii mitochondrial DNA. The N-terminal region of ORF425 and the C-terminal region of ORF1740 had partial similarities to the S3 ribosomal protein of other organisms. The termination codons of rpl16 and orf188 were UGA, which has not hitherto been found in genes encoded in D. discoideum mitochondrial DNA.
Iwamoto
M
M
Institute of Biological Sciences, University of Tsukuba, Japan.
Pi
M
M
Kurihara
M
M
Morio
T
T
Tanaka
Y
Y
D000048:Acanthamoeba / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018388:Codon, Terminator / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics; D016054:DNA, Protozoan / Q000235:genetics; D004023:Dictyostelium / Q000235:genetics*; D019143:Evolution, Molecular; D005656:Fungal Proteins / Q000235:genetics; D005800:Genes, Fungal; D017125:Genes, Protozoan; D005815:Genetic Code; D008969:Molecular Sequence Data; D005810:Multigene Family; D016366:Open Reading Frames; D015183:Restriction Mapping; D012269:Ribosomal Proteins / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
D018388:Codon, Terminator; D004271:DNA, Fungal; D004272:DNA, Mitochondrial; D016054:DNA, Protozoan; D005656:Fungal Proteins; D012269:Ribosomal Proteins