Hydrogenosomes: One Organelle, Multiple Origins
نویسندگان
چکیده
منابع مشابه
Origins of mitochondria and hydrogenosomes.
Complete genome sequences for many mitochondria, as well as for some bacteria, together with the nuclear genome sequence of yeast have provided a coherent view of the origin of mitochondria. In particular, conventional phylogenetic reconstructions with genes coding for proteins active in energy metabolism and translation have confirmed the simplest version of the endosymbiosis hypothesis. In co...
متن کاملEndosymbiotic theory for organelle origins.
Endosymbiotic theory goes back over 100 years. It explains the similarity of chloroplasts and mitochondria to free-living prokaryotes by suggesting that the organelles arose from prokaryotes through (endo)symbiosis. Gene trees provide important evidence in favour of symbiotic theory at a coarse-grained level, but the finer we get into the details of branches in trees containing dozens or hundre...
متن کاملMultiple origins of anaerobic ciliates with hydrogenosomes within the radiation of aerobic ciliates.
Some ciliates live anaerobically and lack mitochondria, but possess hydrogenosomes: organelles that contain hydrogenase and produce hydrogen. The origin of hydrogenosomes has been explained by two competing hypotheses: (i) they are biochemically modified mitochondria; or (ii) they are derived from endosymbiotic association(s) of ciliates and anaerobic eubacteria that possessed the hydrogenosome...
متن کاملThe Core Components of Organelle Biogenesis and Membrane Transport in the Hydrogenosomes of Trichomonas vaginalis
Trichomonas vaginalis is a parasitic protist of the Excavata group. It contains an anaerobic form of mitochondria called hydrogenosomes, which produce hydrogen and ATP; the majority of mitochondrial pathways and the organellar genome were lost during the mitochondrion-to-hydrogenosome transition. Consequently, all hydrogenosomal proteins are encoded in the nucleus and imported into the organell...
متن کاملMitochondria and hydrogenosomes are two forms of the same fundamental organelle.
Published data suggest that hydrogenosomes, organelles found in diverse anaerobic eukaryotes that make energy and hydrogen, were once mitochondria. As hydrogenosomes generally lack a genome, the conversion is probably one way. The sources of the key hydrogenosomal enzymes, pyruvate : ferredoxin oxidoreductase (PFO) and hydrogenase, are not resolved by current phylogenetic analyses, but it is li...
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ژورنال
عنوان ژورنال: BioScience
سال: 2005
ISSN: 0006-3568
DOI: 10.1641/0006-3568(2005)055[0657:hoomo]2.0.co;2