"Regresivn\u00ED evoluce fotosynt\u00E9zy u anoxygenn\u00EDch prokaryot" . "0"^^ . . . "2014-03-31+02:00"^^ . "Anoxygenic phototrophs are one of the oldest life forms on Earth. After oxygenation of Earth's atmosphere 2.3 Myr ago, these organisms had to either retract to marginal anoxic niches or to adapt to the new conditions. Recently, photoheterotrophic bacteria were found abundant in many marine and freshwater environments. Based on phylogenetic analyses the photoheterotrophic species are related not only to full photoautotrophs, but also to strictly heterotrophic species. Such functional diversity raises a question of its evolutionary origin. Already in 1980's Carl Woese speculated that heterotrophic Proteobacteria descent from formerly photosynthetic species, which had lost their photosynthetic genes. The currently available genomic data allows investigating this hypothesis in much more detail. Thus, we propose, to study the phenomenon of regressive evolution of anoxygenic photosynthesis to provide new and detail information on its mechanisms and trajectory."@en . "photosynthesis purple bacteria photoheterotrophy evolution"@en . "Project solution considerably contributed to understanding complexity of photosynthetic genes evolution in anoxygenic phototrophic microorganisms. The most important result is the discovery of the novel phototrophic organism Gemmatimonas AP64 and demonstration of transfer of the photosynthetic gene cluster from Proteobacteria, that expands understanding of the evolution of photosynthesis."@en . . "2010-01-01+01:00"^^ . . . . . . . "http://www.isvav.cz/projectDetail.do?rowId=GAP501/10/0221"^^ . . "Regressive evolution of photosynthesis in anoxygenic prokaryotes"@en . "13"^^ . "13"^^ . . "2014-12-31+01:00"^^ . . . . . . "0"^^ . . "Anoxygenn\u00ED fototrofov\u00E9 pat\u0159\u00ED k nejstar\u0161\u00EDm form\u00E1m \u017Eivota na Zemi. Po okysli\u010Den\u00ED zemsk\u00E9 atmosf\u00E9ry p\u0159ed 2.3 mld let byly tyto organismy donuceny bu\u010F ustoupit do okrajov\u00FDch anaerobn\u00EDch nik nebo se p\u0159izp\u016Fsobit nov\u00FDm podm\u00EDnk\u00E1m. P\u0159ed ned\u00E1vnem se zjistilo, \u017Ee fotoheterotrofn\u00ED bakterie tvo\u0159\u00ED v\u00FDznamnou \u010D\u00E1st mnoh\u00FDch mo\u0159sk\u00FDch a sladkovodn\u00EDch spole\u010Denstev. Fylogenetick\u00E1 anal\u00FDza prok\u00E1zala, \u017Ee tyto fotoheterotrofn\u00ED druhy jsou p\u0159\u00EDbuzn\u00E9 nejen fotoautotrof\u016Fm, ale t\u00E9\u017E mnoha heterotrofn\u00EDm druh\u016Fm. To nastoluje ot\u00E1zku jak se tato funk\u010Dn\u00ED rozr\u016Fzn\u011Bnost v pr\u016Fb\u011Bhu evoluce vyvinula. Ji\u017E v 80. letech Carl Woese navrhnul, \u017Ee heterotrofn\u00ED z\u00E1stupci Proteobakteri\u00ED poch\u00E1zej\u00ED z p\u016Fvodn\u011B fotosyntetick\u00FDch druh\u016F, kter\u00E9 ztratily fotosyntetick\u00E9 geny. Mno\u017Estv\u00ED genetick\u00FDch dat, kter\u00E9 je v sou\u010Dasnosti k dispozici, umo\u017E\u0148uje p\u0159istoupit k problematice tohoto fenom\u00E9nu mnohem detailn\u011Bji. Proto navrhujeme prostudovat regresivn\u00ED v\u00FDvoj anoxygenn\u00ED fotosynt\u00E9zy abychom z\u00EDskali nov\u00E9 a podrobn\u011Bj\u0161\u00ED \u00FAdaje o jej\u00EDm mechanismu a pr\u016Fb\u011Bhu." . . "\u0158e\u0161en\u00ED projektu v\u00FDrazn\u011B p\u0159isp\u011Blo k pochopen\u00ED komplexnosti evoluce fotosyntetick\u00FDch gen\u016F u anoxygenn\u00EDch fototrofn\u00EDch mikroorganism\u016F. Za nejv\u00FDznamn\u011Bj\u0161\u00ED v\u00FDsledek \u0159e\u0161en\u00ED lze pokl\u00E1dat objev fototrofn\u00EDho organismu Gemmatimonas AP64 a prok\u00E1z\u00E1n\u00ED p\u0159enosu clusteru fotosyntetick\u00FDch gen\u016F z Proteobakteri\u00ED, co\u017E p\u0159in\u00E1\u0161\u00ED nov\u00FD pohled na evoluci fotosynt\u00E9zy. Tento v\u00FDsledek byl publikov\u00E1n v PNAS."@cs . "GAP501/10/0221" . "2015-05-22+02:00"^^ . "1"^^ . . .