>cd07019 S49_SppA_1 Signal peptide peptidase A (SppA), a serine protease, has catalytic Ser-Lys dyad. Signal peptide peptidase A (SppA; Peptidase S49; Protease IV): SppAs in this subfamily are found in all three domains of life and are involved in the cleavage of signal peptides after their removal from the precursor proteins by signal peptidases. Site-directed mutagenesis and sequence analysis have shown these bacterial, archaeal and thylakoid SppAs to be serine proteases. The predicted active site serine for members in this family occurs in a transmembrane domain. Mutagenesis studies also suggest that the catalytic center comprises a Ser-Lys dyad (both residues absolutely conserved within bacteria, chloroplast and mitochondrial signal peptidase family members) and not the usual Ser-His-Asp catalytic triad found in the majority of serine proteases. In addition to the carboxyl-terminal protease domain that is conserved in all the S49 family members, the E. coli SppA contains an amino-te

Probab=100.00 E-value=0 Score=369.84 Aligned_cols=201 Identities=30% Similarity=0.477 Sum_probs=192.8 Q ss_pred EEEEEEEEEEECC---------HHHHHHHHHHHHCCCCCCEEEEECCCCCCCHHHHHHHHHHHHHHCC-CCCEEEEECCC Q ss_conf 2899997666238---------6999999999861899879999758888888999999999998414-78679960332 Q gi|254780747|r 37 HVARIAIRGQIED---------SQELIERIERISRDDSATALIVSLSSPGGSAYAGEAIFRAIQKVKN-RKPVITEVHEM 106 (293) Q Consensus 37 ~i~~i~i~G~I~~---------~~~l~~~l~~a~~d~~ik~ivL~i~SpGG~~~~~~~i~~ai~~~k~-~kpvva~~~~~ 106 (293) T Consensus 1 ~iaVi~~~G~I~~~~~~~~~~~~~~i~~~l~~A~~d~~Vkavvl~InSpGG~~~~s~~i~~~i~~~~~~~KPVva~~~~~ 80 (211) T cd07019 1 SIGVVFANGAIVDGEETQGNVGGDTTAAQIRDARLDPKVKAIVLRVNSPGGSVTASEVIRAELAAARAAGKPVVVSAGGA 80 (211) T ss_pred CEEEEEEEEEECCCCCCCCCCCHHHHHHHHHHHHHCCCCCEEEEEEECCCCCHHHHHHHHHHHHHHHHCCCCEEEEECCC T ss_conf 98999988788379887887589999999999952899738999976969768999999999999864699799997784 Q ss_pred CCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCHHHHHHHHHHHCCEEEEECCCCCCCCCCCCCCHHHHHHHHHHHHHHH Q ss_conf 33223210001110001301353455565302102456777420422553155211234666789999887777766666 Q gi|254780747|r 107 AASAGYLISCASNIIVAAETSLVGSIGVLFQYPYVKPFLDKLGVSIKSVKSSPMKAEPSPFSEVNPKAVQMMQDVVDSSY 186 (293) Q Consensus 107 ~~S~~Y~iAs~ad~I~a~p~s~vGsiGv~~~~~~~~~ll~k~gi~~~~~~~g~~K~~~~p~~~~s~e~~~~~~~~l~~~~ 186 (293) T Consensus 81 aaSggY~iAsaad~I~a~p~s~vGSIGV~~~~~~~~~~~~k~Gi~~~~i~~~~~~~-~~~~~~lt~e~r~~~q~~vd~~~ 159 (211) T cd07019 81 AASGGYWISTPANYIVANPSTLTGSIGIFGVITTVENSLDSIGVHTDGVSTSPLAD-VSITRALPPEAQLGLQLSIENGY 159 (211) T ss_pred CCHHHHHHHHCCCEEEECCCCCEEEEEEEEEECCHHHHHHHCCEEEEEEECCCCCC-CCCCCCCCHHHHHHHHHHHHHHH T ss_conf 43488999855898998488735655689983376777774683578997456666-78889999999999999999999 Q ss_pred HHHHHHHHHCCCCCHHHHHHHHCCCCCCHHHHHHCCCCCCCCCHHHHHHHHH Q ss_conf 7789999851499988998873498237889987798062389899999999 Q gi|254780747|r 187 HWFVRLVSESRNIPYDKTLVLSDGRIWTGAEAKKVGLIDVVGGQEEVWQSLY 238 (293) Q Consensus 187 ~~f~~~Va~~R~~~~~~~~~~~~g~~~~~~~A~~~GLvD~ig~~~~a~~~l~ 238 (293) T Consensus 160 ~~F~~~Va~~R~~~~~~v~~~a~G~v~~g~~A~~~GLiD~ig~~~~ai~~aa 211 (211) T cd07019 160 KRFITLVADARHSTPEQIDKIAQGHVWTGQDAKANGLVDSLGDFDDAVAKAA 211 (211) T ss_pred HHHHHHHHHHCCCCHHHHHHHCCCCEEEHHHHHHCCCCCCCCCHHHHHHHHC T ss_conf 9999999976799957837546855787899998699655699999999759

HHsearch alignment for GI: 254780747 and conserved domain: cd07019