Sec61p/SecYEG complexes mediate protein translocation across membranes and are present in both eukaryotes and bacteria. Whereas homologues of Sec61α/SecY and Sec61γ/SecE exist in archaea, identification of the third component (Sec61β or SecG) has remained elusive. Using PSI-BLAST, the archaeal counterpart of Sec61β has been detected. With the identification of the Sec61β motif, functions for a universal family of archaeal proteins can be predicted and the archaeal translocon system can be definitively detected.
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