HHsearch alignment for GI: 254780817 and conserved domain: TIGR00809

>TIGR00809 secB protein-export chaperone SecB; InterPro: IPR003708 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 . Recently, the tertiary structure of Haemophilus influenzae SecB (P44853 from SWISSPROT) was resolved by means of X-ray crystallography to 2.5A . The chaperone comprises four chains, forming a tetramer, each chain of which has a simple alpha+beta fold arrangement. While one binding site on the homotetramer recognises unfolded polypeptides by hydrophobic interactions, the second binds to SecA through the latter's C-terminal 22 residues.; GO: 0051082 unfolded protein binding, 0015031 protein transport, 0051262 protein tetramerization.
Probab=99.94  E-value=1.5e-26  Score=176.91  Aligned_cols=140  Identities=29%  Similarity=0.646  Sum_probs=131.0

Q ss_pred             CCCCCCHHHHEEEHHHCCCCCCHH-HHHHHHHCCCCEEEEEEEECCCCCCCC-EEEEEEEEEECCCCC-CCCCEEEEEEE
Q ss_conf             113010123013011103788716-776431015841588865121214654-057999984046766-54301257754
Q gi|254780817|r    4 KQKQAFTILNQYIKDFSFESPNAP-HCFFDIQNQQPTIKINVQVNANTISGA-DFDVILSFDIEAKNN-DKVIFRLELAY   80 (152)
Q Consensus         4 ~~~~~~~I~~qYIKDLSFE~P~ap-~~f~~~~~~~p~~~i~i~i~~~~l~~~-~~EV~l~l~~~ak~~-~~~~f~~Ei~y   80 (152)
T Consensus         2 ~~~p~~~~~~~~~~d~~~~~p~~p~~~~--~~~~~p~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   79 (146)
T TIGR00809         2 ELQPVFSIERLYVKDLSLEAPNAPSHLF--LLDWEPEVDLDLDTGSTQLGDDNLYEVVLNVTVTAKLEDEETLFLCEVKQ   79 (146)
T ss_pred             CCCCHHHHHHHHHHHHCCCCCCCCHHHH--HHCCCCCCCEEECCCCCCCCCCCEEEEEEEEEEEEECCCCCEEEEEECCC
T ss_conf             6540112233322110013667522445--42156642111012211024563246676667764036641211000000


Q ss_pred             EEEEEECCCCCHHHHHHHHHCCCHHHHHHHHHHHHHHHHHCCCCCCCCCCCCHHHHHHHHHHHHH
Q ss_conf             68999758871034446663045534178999999999738998866055398999999999998
Q gi|254780817|r   81 SGILRILDCPQEHISQILFVECPQLLFPFVRQIISNTIRDGGFPPLVIDTIDFLKLFQQEKSLIK  145 (152)
Q Consensus        81 agif~i~~~~~~~l~~illv~~P~~lfP~~R~ii~~~~~~~Gfp~l~l~~IdF~~LY~~~~~~~~  145 (152)
T Consensus        80 ~g~~~~~~~~~~~~~~~~~~~cp~~~~p~~~~~~~~~~~~~~~~~~~~~p~~~~~~~~~~~~~~~  144 (146)
T TIGR00809        80 AGVFNLAGLEGEQHPHLLGVHCPNLLFPYARELVSSLVSRGGFPPLNLAPVNFDALYHEYLQKQE  144 (146)
T ss_pred             CCEEEECCCCCHHHHHHHHHHCCHHHHHHHHHHHHHHHCCCCCCCEEECCCCHHHHHHHHHHHHH
T ss_conf             23133215772013455433110233256777775432024655100031212578888775530