RPSBLAST alignment for GI: 254780747 and conserved domain: cd07018

>gnl|CDD|132929 cd07018, S49_SppA_67K_type, Signal peptide peptidase A (SppA) 67K type, a serine protease, has catalytic Ser-Lys dyad. Signal peptide peptidase A (SppA; Peptidase S49; Protease IV) 67K type: 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. Members in this subfamily contain 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. Unlike the eukaryotic functional homologs that are proposed to be aspartic proteases, site-directed mutagenesis and sequence analysis have shown that members in this subfamily, mostly bacterial, are 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. Interestingly, the single membrane spanning E. coli SppA carries out catalysis using a Ser-Lys dyad with the serine located in the conserved carboxy-terminal protease domain and the lysine in the non-conserved amino-terminal domain. Length = 222
 Score = 91.4 bits (228), Expect = 2e-19
 Identities = 46/190 (24%), Positives = 93/190 (48%), Gaps = 4/190 (2%)

Query: 51  QELIERIERISRDDSATALIVSLSSPGGSAYAGEAIFRAIQKVKN-RKPVITEVHEMAAS 109
           ++L+E +E+ + DD    +++ L    G     E + +A+++ +   KPVI    +  + 
Sbjct: 32  RDLLEALEKAAEDDRIKGIVLDLDGLSGGLAKLEELRQALERFRASGKPVIAYA-DGYSQ 90

Query: 110 AGYLISCASNIIVAAETSLVGSIGVLFQYPYVKPFLDKLGVSIKSVKSSPMKAEPSPFSE 169
             Y ++ A++ I    +  V   G+  +  + K  LDKLGV ++  +    K+   PF+ 
Sbjct: 91  GQYYLASAADEIYLNPSGSVELTGLSAETLFFKGLLDKLGVEVQVFRVGEYKSAVEPFTR 150

Query: 170 VN--PKAVQMMQDVVDSSYHWFVRLVSESRNIPYDKTLVLSDGRIWTGAEAKKVGLIDVV 227
            +  P+A +  Q ++DS +  ++  V+ SR +  D    L D    +  EA + GL+D +
Sbjct: 151 DDMSPEAREQTQALLDSLWDQYLADVAASRGLSPDALEALIDLGGDSAEEALEAGLVDGL 210

Query: 228 GGQEEVWQSL 237
             ++E+   L
Sbjct: 211 AYRDELEARL 220