Figure 3.

Domain models of ATP sulfurylase (ATPS). (A) ATPS proteins of cyanobacteria, green algae, red algae, plastidial isoform of “red lineage” algae (with the exception of T. pseudonana). (B) metazoan PAPS synthetase with an APS kinase (APK) domain at the N-terminus of the ATPS domain. (C) cytosolic ATPS proteins of diatoms and haptophytes with an APK domain at the N-terminus and a pyrophosphatase (PPiase) domain at the C-terminus. (D) ATPS proteins of fungi and of the thermophylic bacterium Aquifex aeolicus fused with an APK domain at the C-terminus. (E) ATPS proteins of dinoflagellates, the apicomplexan Chromera velia and the filasterian Capsaspora owczarzaki, fused with an APS reductase (APR) at the N-terminus.