>TIGR00966 3a0501s07 protein-export membrane protein SecF; InterPro: IPR005665 Secretion across the inner membrane in some Gram-negative bacteria occurs via the preprotein translocase pathway. Proteins are produced in the cytoplasm as precursors, and require a chaperone subunit to direct them to the translocase component. . From there, the mature proteins are either targeted to the outer membrane, or remain as periplasmic proteins. The translocase protein subunits are encoded on the bacterial chromosome. The translocase itself comprises 7 proteins, including a chaperone protein (SecB), an ATPase (SecA), an integral membrane complex (SecCY, SecE and SecG), and two additional membrane proteins that promote the release of the mature peptide into the periplasm (SecD and SecF) . The chaperone protein SecB is a highly acidic homotetrameric protein that exists as a "dimer of dimers" in the bacterial cytoplasm. SecB maintains preproteins in an unfolded state after translation, and targets these to the peripheral membrane protein ATPase SecA for secretion . Together with SecY and SecG, SecE forms a multimeric channel through which preproteins are translocated, using both proton motive forces and ATP-driven secretion. The latter is mediated by SecA. The structure of the Escherichia coli SecYEG assembly revealed a sandwich of two membranes interacting through the extensive cytoplasmic domains . Each membrane is composed of dimers of SecYEG. The monomeric complex contains 15 transmembrane helices. This family consists of various prokaryotic SecF protein export membrane proteins. The SecD and SecF equivalents of the Gram-positive bacterium Bacillus subtilis are jointly present in one polypeptide, denoted SecDF, that is required to maintain a high capacity for protein secretion. Unlike the SecD subunit of the pre-protein translocase of Escherichia coli, SecDF of B. subtilis was not required for the release of a mature secretory protein from the membrane, indicating that SecDF is involved in earlier translocation steps . Comparison with SecD and SecF proteins from other organisms revealed the presence of 10 conserved regions in SecDF, some of which appear to be important for SecDF function. Interestingly, the SecDF protein of B. subtilis has 12 putative transmembrane domains. Thus, SecDF does not only show sequence similarity but also structural similarity to secondary solute transporters . ; GO: 0015450 P-P-bond-hydrolysis-driven protein transmembrane transporter activity, 0006886 intracellular protein transport, 0009276 1-2nm peptidoglycan-based cell wall.

Probab=99.86  E-value=2.6e-21  Score=143.23  Aligned_cols=156  Identities=26%  Similarity=0.532  Sum_probs=146.5

Q ss_pred             EEEEECCCHHHHHHHHHHHHHHHHHHHHHHHHC-CCCHHHHHHHHHHHHHHHHHHHHHH----HHHHHHHHHHHHHHHHH
Q ss_conf             011001102457888888999999999999730-3203566667777778899999999----87665578999999865
Q gi|254780925|r  351 NVGADLGSDSIYKGTCAIVAGLVLIVLFMIVLY-GKWGLVADFSIFLNVILTLALLSLL----GATLTLPSIAGIVLGIG  425 (833)
Q Consensus       351 ~~~~~~~~~~~~~~~~~~~~~lvvvvv~l~l~~-~r~~li~~iaIpisii~tl~~l~~~----G~tLn~~sl~gl~~~~g  425 (833)
T Consensus       136 F~~p~vg~~L~~~a~~al~~al~~I~~Y~~~RFew~~A~gai~AL~HDv~~t~G~~~~fGlvG~~E~~l~~vaAlLTiiG  215 (307)
T TIGR00966       136 FVDPSVGGELARKAVLALLAALVLILIYIGVRFEWRFALGAIVALVHDVIITVGVFSLFGLVGGIEVNLTTVAALLTIIG  215 (307)
T ss_pred             CCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCEEECHHHHHHHHHHHH
T ss_conf             76874138999999999999999999999998888889999999999999999999998423734443899888888761


Q ss_pred             HHHHHHHHHHHHHHHHHH---CCC--CHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCC-----CHHHHHHHHH
Q ss_conf             335789999999876310---255--579999999999999999765568999888761455443-----1147887788
Q gi|254780925|r  426 LAVDSNILVNERIREENR---KNQ--SVFCSLDMGFSRAYSTIFDSNITALIATVVLFFFGGGAV-----RGFAITMGLS  495 (833)
Q Consensus       426 ~~vd~~i~~~e~~~~~~~---~~~--~~~~a~~~~~~~~~~~i~~~~~t~~~~~~~l~~~~~~~~-----~~f~~~~~~~  495 (833)
T Consensus       216 YS~NDTVVvFDR~REn~~~~~k~~~~~~~~~~n~SinqTL~RTi~Ts~TTll~~l~L~~fGg~~lG~G~L~~FsL~~~vG  295 (307)
T TIGR00966       216 YSINDTVVVFDRIRENLRGFQKYKRKTLTEVINLSINQTLSRTILTSLTTLLAVLALLVFGGGVLGVGTLKDFSLALLVG  295 (307)
T ss_pred             EEEEEEEEEEECCHHHHHHHHCCCCCCHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHHCCHHEEEHHHHHHEEEEEE
T ss_conf             13433799980305555543146798999997466314021124888999999999888631211000021021122244


Q ss_pred             HHHHHHHHHHH
Q ss_conf             89987777511
Q gi|254780925|r  496 ILISMFTAISI  506 (833)
Q Consensus       496 ~~~~~~~~~~~  506 (833)
T Consensus       296 ~~~GTYSSIFi  306 (307)
T TIGR00966       296 VIVGTYSSIFI  306 (307)
T ss_pred             EEEEEEEEEEE
T ss_conf             35663245763