Preprotein translocase subunit; The central subunit of the protein translocation channel SecYEG. Consists of two halves formed by TMs 1-5 and 6-10. These two domains form a lateral gate at the front which open onto the bilayer between TMs 2 and 7, and are clamped together by SecE at the back. The channel is closed by both a pore ring composed of hydrophobic SecY resides and a short helix (helix 2A) on the extracellular side of the membrane which forms a plug. The plug probably moves laterally to allow the channel to open. The ring and the pore may move independently.

Translocase binding subunit (ATPase); Part of the Sec protein translocase complex. Interacts with the SecYEG preprotein conducting channel. Has a central role in coupling the hydrolysis of ATP to the transfer of proteins into and across the cell membrane, serving as an ATP-driven molecular motor driving the stepwise translocation of polypeptide chains across the membrane; Belongs to the SecA family.

Preprotein translocase subunit; Involved in protein export. Participates in an early event of protein translocation (By similarity).

Preprotein translocase subunit; Essential subunit of the Sec protein translocation channel SecYEG. Clamps together the 2 halves of SecY. May contact the channel plug during translocation.

Signal recognition particle (docking protein); Involved in targeting and insertion of nascent membrane proteins into the cytoplasmic membrane. Acts as a receptor for the complex formed by the signal recognition particle (SRP) and the ribosome-nascent chain (RNC).

Component of the preprotein translocase; The SecYEG-SecDF-YajC-YidC holo-translocon (HTL) protein secretase/insertase is a supercomplex required for protein secretion, insertion of proteins into membranes, and assembly of membrane protein complexes. While the SecYEG complex is essential for assembly of a number of proteins and complexes, the SecDF-YajC-YidC subcomplex facilitates these functions.

Signal recognition particle-like (SRP) GTPase; Involved in targeting and insertion of nascent membrane proteins into the cytoplasmic membrane. Binds to the hydrophobic signal sequence of the ribosome-nascent chain (RNC) as it emerges from the ribosomes. The SRP-RNC complex is then targeted to the cytoplasmic membrane where it interacts with the SRP receptor FtsY. Interaction with FtsY leads to the transfer of the RNC complex to the Sec translocase for insertion into the membrane, the hydrolysis of GTP by both Ffh and FtsY, and the dissociation of the SRP-FtsY complex into the individua [...]

Regulator of OxaAB translation; Sensor protein that upregulates translation of the secondary membrane protein insertase (MisCB/YqjG) when activity of the primary membrane protein insertase (MisCA/SpoIIIJ) is limited. Acts as a ribosome-nascent chain complex. When the primary membrane protein insertase activity or level is reduced, the membrane insertion of MifM is impaired, which induces arrest of MifM translation and unfolding of the mRNA hairpin. Unfolding leads to translation of the downstream gene, which encodes the secondary membrane protein insertase MisCB/YqjG. Translation arres [...]

Sec-independent factor for membrane protein insertion (YidC/SpoIIIJ family); Required for the insertion and/or proper folding and/or complex formation of integral membrane proteins into the membrane. Involved in integration of membrane proteins that insert both dependently and independently of the Sec translocase complex, as well as at least some lipoproteins (By similarity). Also involved in protein secretion processes. Essential for sporulation by activating sigma factor SpoIIIG/SigG after engulfment is completed in the prespore, maybe by acting on SpoIIIAE. It has an overlapping, al [...]