The mitochondrial genome of Chlorogonium elongatum inferred from the complete sequence.
The 22,704-bp circular mitochondrial DNA (mtDNA) of the chlamydomonad alga Chlorogonium elongatum was completely cloned and sequenced. The genome encodes seven proteins of the respiratory electron transport chain, subunit 1 of the cytochrome oxidase complex (cox1), apocytochrome b (cob), five subunits of the NADH dehydrogenase complex (nad1, nad2, nad4, nad5, and nad6), a set of three tRNAs (Q, W, M), and the large (LSU)- and small (SSU)-subunit ribosomal RNAs. Six group-I introns were found, two each in the cox1, cob, and nad5 genes. In each intron an open reading frame (ORF) related to maturases or endonucleases was identified. Both the LSU and the SSU rRNA genes are split into fragments intermingled with each other and with other genes. Although the average A + T content is 62.2%, GC-rich clusters were detected in intergenic regions, in variable domains of the rRNA genes, and in introns and intron-encoded ORFs. A comparison of the genome maps reveals that C. elongatum and Chlamydomonas eugametos mtDNAs are more closely related to one another than either is to Chlamydomonas reinhardtii mtDNA.
Institut für Pflanzenphysiologie der Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 54-62, 35392 Giessen, Germany.
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Kroymann
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Zetsche
D001059:Apoproteins / Q000235:genetics; D001483:Base Sequence; D000460:Chlorophyta / Q000201:enzymology / Q000235:genetics*; D003573:Cytochrome b Group / Q000235:genetics; D045303:Cytochromes b; D004272:DNA, Mitochondrial / Q000235:genetics*; D003576:Electron Transport Complex IV / Q000235:genetics; D018745:Genome, Plant; D007438:Introns; D046911:Macromolecular Substances; D008928:Mitochondria / Q000201:enzymology / Q000235:genetics*; D008969:Molecular Sequence Data; D009245:NADH Dehydrogenase / Q000235:genetics; D009690:Nucleic Acid Conformation; D016366:Open Reading Frames; D018749:RNA, Plant / Q000737:chemistry / Q000235:genetics*; D016415:Sequence Alignment
D001059:Apoproteins; D003573:Cytochrome b Group; D004272:DNA, Mitochondrial; D046911:Macromolecular Substances; D018749:RNA, Plant; D045303:Cytochromes b; D009245:NADH Dehydrogenase; D003576:Electron Transport Complex IV