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Joined: Sep. 2006

(Permalink) Posted: Feb. 16 2012,12:11   

Quote (Starbuck @ Feb. 14 2012,11:40)
SRP-GTPases are post-LUCA ( Leipe et al., J
Mol Biol. 2002 Mar 15;317(1):41-72.)

Sorry, I'm not seeing that as a conclusion of the paper you cited.

Quote
The SRP and receptor GTPases are ubiquitous in the three superkingdoms and the two corresponding parts of the phylogenetic tree follow the standard model, with distinct archaeo-eukaryotic branches (Figure 5(l)). This indicates that both these GTPases were already present in the LUCA and that the original duplication leading to the divergence of SR and FtsY occurred at an even earlier stage of evolution.164

  
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