منابع مشابه
Studies on the Origin of Yeast Mitochondria
The mitochondria of aerobically grown yeast, in common with those of higher organisms, contain the terminal electron transport, oxidative phosphorylation, and citric acid cycle enzymes of the cell (9). However, unlike higher organisms, the yeast cell is capable of both aerobic and anaerobic growth, and, as was reported some years ago, the b and a cytochromes are not synthesized in the absence o...
متن کاملCell Evolution: Gene Transfer Agents and the Origin of Mitochondria
Recently, α-proteobacteria have been shown to possess virus-like gene transfer agents that facilitate high frequency gene transfer in natural environments between distantly related lineages. This system could have driven the genomic integration of the mitochondrial progenitor and its proto-eukaryote host and contributed to the evolutionary mosaic of genes seen in modern-day prokaryotic and euka...
متن کاملBacterial genome chimaerism and the origin of mitochondria.
Many studies have sought to determine the origin and evolution of mitochondria. Although the Alphaproteobacteria are thought to be the closest relatives of the mitochondrial progenitor, there is dispute as to what its particular sister group is. Some have argued that mitochondria originated from ancestors of the order Rickettsiales, or more specifically of the Rickettsiaceae family, while other...
متن کاملRickettsiaceae, rickettsia-like endosymbionts, and the origin of mitochondria.
Accumulating evolutionary data point to a monophyletic origin of mitochondria from the order Rickettsiales. This large group of obligate intracellular alpha-Proteobacteria includes the family Rickettsiaceae and several rickettsia-like endosymbionts (RLEs). Detailed phylogenetic analysis of small subunit (SSU) rRNA and chaperonin 60 (Cpn60) sequences testify to polyphyly of the Rickettsiales, an...
متن کاملAn integrated phylogenomic approach toward pinpointing the origin of mitochondria
Overwhelming evidence supports the endosymbiosis theory that mitochondria originated once from the Alphaproteobacteria. However, its exact position in the tree of life remains highly debated. This is because systematic errors, including biased taxonomic sampling, high evolutionary rates and sequence composition bias have long plagued the mitochondrial phylogenetics. In this study, we address th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 1973
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.182.4107.85