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closeCombinator30
Posted by Combinator30 on 16 Mar 2016 at 16:24 GMT
Thank's for the interestig paper. But on my view (supported by genome analysis) operon of genes for photosynthesis was delivered to Heliobacteria by means of obvious HGT event from Cyanobacteria like organism. So as consequence of this fact I thinks that some conclusions of the article may be in questions...
RE: Combinator30
tanaicardona replied to Combinator30 on 16 Mar 2016 at 17:20 GMT
What exactly do you mean with a "Cyanobacteria like organism"? An ancestor to the phylum Cyanobacteria having a homodimeric Type I reaction center? Was this an oxygenic or an anoxygenic phototrophic bacterium? If it is such an ancestral form of Cyanobacteria that it was anoxygenic and had a homodimeric Type I reaction center, how do you rule out the possibility that this hypothetical ancestral organism was not also an ancestor to the Firmicutes?
It's really not possible. The type of reaction center protein found in heliobacteria, PshA, is inconsistent with such an event of HGT. Cyanobacteria have Photosystem I, that is heterodimeric, made of two subunits PsaA and PsaB, quite distinct from the PshA reaction center protein found in heliobacteria. Two completely different evolutionary paths...
RE: Combinator30
tanaicardona replied to Combinator30 on 16 Mar 2016 at 17:25 GMT
Thank you for reading and commenting by the way! I really appreciate some debate ;)