Abstract
ATP-binding cassette (ABC) transporters are integral membrane proteins that harness the energy stored in ATP to transport diverse substrates across biological membranes. Similar to other active transporters, an “alternating access” mechanism has been proposed to describe the transport process in ABC transporters, which states that these proteins alternate between an inward-facing (IF) and an outward-facing (OF) state in order to actively transport their substrates. Peptidase-containing ABC transporter 1 (PCAT1) is a bacterial ABC exporter that processes and secretes polypeptides and proteins, forming a simple Sec-independent secretion pathway.
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