Proteins serve a variety of roles in the cell. One protein, SecY, manages the movement or 'translocation' of other protein segments across the membrane (i.e., a polypeptide helix). The helix (in blue), forces open the pore ring (yellow) and displaces the plug of SecY (red), thus completing a protein translocation event.
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http://www.ks.uiuc.edu/Research/translocon/
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