SecE is part of the SecYEG complex in bacteria which translocates proteins from the cytoplasm. In eukaryotes the complex, made from Sec61-gamma and Sec61-alpha translocates protein from the cytoplasm to the ER. Archaea have a similar complex.

1: Protein translocation in the three domains of life: variations on a theme. Pohlschroder M, Prinz WA, Hartmann E, Beckwith J; Cell 1997;91:563-566. PMID:9393849