>cd07023 S49_Sppa_N_C Signal peptide peptidase A (SppA), a serine protease, has catalytic Ser-Lys dyad. Signal peptide peptidase A (SppA; Peptidase S49; Protease IV): SppA is found in all three domains of life and is involved in the cleavage of signal peptides after their removal from the precursor proteins by signal peptidases. This subfamily contains members with either a single domain (sometimes referred to as 36K type), such as sohB peptidase, protein C and archaeal signal peptide peptidase, or an amino-terminal domain in addition to the carboxyl-terminal protease domain that is conserved in all the S49 family members (sometimes referred to as 67K type), similar to E. coli and Arabidopsis thaliana SppA peptidases. Site-directed mutagenesis and sequence analysis have shown these 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

Probab=99.63 E-value=1.1e-14 Score=113.14 Aligned_cols=163 Identities=22% Similarity=0.240 Sum_probs=121.0 Q ss_pred EEEECCCCC---HHHHHHHHHHHHHHHHCCCCCCEEEEEECCCCCHHHHHHHHHHHHHCC---CCEEEEEECCCCCCCCC Q ss_conf 799878318---989999999999974115769769999368761467899999986448---73489983155665200 Q gi|254780272|r 44 IVFVTGQIE---DHMATLICAQLLFLEAENPQKEISLYINSPGGVVTAGMAIYDTMQFIK---PPISTFCMGQAASMGSL 117 (216) Q Consensus 44 iifl~g~I~---~~~a~~iia~Ll~L~~~~~~k~I~l~INSpGG~v~~glaIyD~i~~i~---~~V~Ti~~G~aaS~asl 117 (216) T Consensus 4 vi~~~G~i~~~~~~~~~~i~~~l~~A~~d~~vk~ivL~idSpGG~~~~s~ei~~~i~~~k~~~KpV~a~~~~~aaSg~Y~ 83 (208) T cd07023 4 VIDIEGTISDGGGIGADSLIEQLRKAREDDSVKAVVLRINSPGGSVVASEEIYREIRRLRKAKKPVVASMGDVAASGGYY 83 (208) T ss_pred EEEEEEEECCCCCCCHHHHHHHHHHHHHCCCCCEEEEEEECCCCCHHHHHHHHHHHHHHHCCCCEEEEEECCHHHCHHHH T ss_conf 99988788899986999999999999508997489999748996299999999999987514985999977711133456 Q ss_pred CCCCCCCCCEEECCCHHH------HHHHHHHHH------------HH------------HHHHHHHHHHHHHHHHHHHHH Q ss_conf 002467771455441566------441256666------------55------------541289999999999999999 Q gi|254780272|r 118 LLSAGEKGMRFALPNARI------LLHQPSGGF------------SG------------QASDIERHAQDIVKIKRRLNE 167 (216) Q Consensus 118 Il~aG~~g~R~~~pns~i------MiHqps~~~------------~G------------~~~di~~~a~el~~~~~~l~~ 167 (216) T Consensus 84 lAs~ad--~I~a~p~s~vGSIGv~~~~~~~~~~l~k~Gi~~~~~~~G~~K~~~~~~~~~s~e~~~~~~~~ld~~~~~F~~ 161 (208) T cd07023 84 IAAAAD--KIVANPTTITGSIGVIGQGPNLEELLDKLGIERDTIKSGPGKDKGSPDRPLTEEERAILQALVDDIYDQFVD 161 (208) T ss_pred HHHCCC--EEEECCCCEECCCCEEEECCCHHHHHHHCCCCEEEEECCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHH T ss_conf 551287--799778763332003663268899999769706999525623345777789999999999999999999999 Q ss_pred HHHHHCCCCHHHHHHHHCCCCCCCHHHHHHCCCCCEEECCCC Q ss_conf 999871999899999724585888899997588644604542 Q gi|254780272|r 168 IYVKNCGKTYEEVEKTLDRDHIMSASEACDWGVVDKVLMSRI 209 (216) Q Consensus 168 i~a~~Tg~~~e~i~~~~~rD~~lsa~EA~eyGliD~Ii~~~~ 209 (216) T Consensus 162 ~Va~~R~~~~~~v~~~~~g~v-~~~~~A~~~GLiD~ig~~~e 202 (208) T cd07023 162 VVAEGRGMSGERLDKLADGRV-WTGRQALELGLVDELGGLDD 202 (208) T ss_pred HHHHHCCCCHHHHHHHHCCCE-EEHHHHHHCCCCCCCCCHHH T ss_conf 999866999899999857986-70999998699753399999

HHsearch alignment for GI: 254780272 and conserved domain: cd07023