>cd07022 S49_Sppa_36K_type Signal peptide peptidase A (SppA) 36K type, a serine protease, has catalytic Ser-Lys dyad. Signal peptide peptidase A (SppA; Peptidase S49; Protease IV) 36K 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 are all bacterial and include sohB peptidase and protein C. These are sometimes referred to as 36K type since they contain only one domain, unlike E. coli SppA that also contains an amino-terminal domain. 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 and not the usual Ser-His-Asp catalytic triad found in the majority of serine proteases.

Probab=96.16  E-value=0.017  Score=36.26  Aligned_cols=55  Identities=31%  Similarity=0.400  Sum_probs=40.5

Q ss_pred             CHHHHHHHHHCCCCCCEEEEEEE-CCCHHH--HHHHHHHHHHHHCCCCCCEEEEEEEECCC
Q ss_conf             99999999973998728899970-587248--99999999864226755268998430157
Q gi|254781050|r  192 EFIDVLELFLADEATESIVMVGE-IGGSAE--EEAAQFLKDEAKRGRKKPIVGFVAGKTAP  249 (300)
Q Consensus       192 ~~~d~L~~~~~Dp~T~~Ivl~gE-iGG~~E--~~aa~fi~~~~~~~~~KPVva~~~GrtAp  249 (300)
T Consensus        29 ~i~~~l~~A~~d~~vkaivL~InSPGG~~~~s~~i~~~I~~~---~~~KPVva~~~~~~aS   86 (214)
T cd07022          29 GIAAAIRAALADPDVRAIVLDIDSPGGEVAGVFELADAIRAA---RAGKPIVAFVNGLAAS   86 (214)
T ss_pred             HHHHHHHHHHCCCCCCEEEEEEECCCCCHHHHHHHHHHHHHH---CCCCCEEEEECCCHHH
T ss_conf             999999999509997589999979897689999999999986---0899899998881156