FIG 5.

Selected domains with eukaryote-like structures and with putative functions in symbiont-host interactions in the Riftia symbiont and in selected other organisms and metagenomes. Color scale shows the percentage of genes/proteins containing the respective domain relative to all gene/protein sequences in this organism or metagenome. Numbers indicate the total number of genes/proteins containing the respective domain. For an overview of all analyzed organisms and domains, see Text S1, Fig. S5. For details on the organisms and communities, see Table S1d. The vent metagenome was sampled from hydrothermal vent fluid at a diffuse-flow vent site (Crab Spa) (137), which also houses Riftia. For further information about the selected protein groups, see Table S2. Riftia pachyptila endosymbiont metaproteome refers to the Riftia symbiont proteins detected in this study.