HHsearch alignment for GI: 254780773 and conserved domain: TIGR02860

>TIGR02860 spore_IV_B stage IV sporulation protein B; InterPro: IPR014219 Proteolytic enzymes that exploit serine in their catalytic activity are ubiquitous, being found in viruses, bacteria and eukaryotes . They include a wide range of peptidase activity, including exopeptidase, endopeptidase, oligopeptidase and omega-peptidase activity. Over 20 families (denoted S1 - S66) of serine protease have been identified, these being grouped into clans on the basis of structural similarity and other functional evidence . Structures are known for members of the clans and the structures indicate that some appear to be totally unrelated, suggesting different evolutionary origins for the serine peptidases . Not withstanding their different evolutionary origins, there are similarities in the reaction mechanisms of several peptidases. Chymotrypsin, subtilisin and carboxypeptidase C have a catalytic triad of serine, aspartate and histidine in common: serine acts as a nucleophile, aspartate as an electrophile, and histidine as a base . The geometric orientations of the catalytic residues are similar between families, despite different protein folds . The linear arrangements of the catalytic residues commonly reflect clan relationships. For example the catalytic triad in the chymotrypsin clan (PA) is ordered HDS, but is ordered DHS in the subtilisin clan (SB) and SDH in the carboxypeptidase clan (SC) , . Peptidases are grouped into clans and families. Clans are groups of families for which there is evidence of common ancestry. Each clan is identified with two letters, the first representing the catalytic type of the families included in the clan (with the letter 'P' being used for a clan containing families of more than one of the catalytic types serine, threonine and cysteine). Some families cannot yet be assigned to clans, and when a formal assignment is required, such a family is described as belonging to clan A-, C-, M-, S-, T- or U-, according to the catalytic type. Some clans are divided into subclans because there is evidence of a very ancient divergence within the clan, for example MA(E), the gluzincins, and MA(M), the metzincins. Families are grouped by their catalytic type, the first character representing the catalytic type: A, aspartic; C, cysteine; G, glutamic acid; M, metallo; S, serine; T, threonine; and U, unknown. The serine, threonine and cysteine peptidases utilise the amino acid as a nucleophile and form an acyl intermediate - these peptidases can also readily act as transferases. In the case of aspartic, glutamic and metallopeptidases, the nucleophile is an activated water molecule. SpoIVB, the stage IV sporulation protein B of endospore-forming bacteria such as Bacillus subtilis, is a serine proteinase expressed in the spore (rather than mother cell) compartment, that participates in a proteolytic activation cascade for Sigma-K. It appears to be universal among endospore-forming bacteria and occurs nowhere else. The members of this entry belong to MEROPS peptidase family S55 (SpoIVB peptidase, clan PA)..
Probab=98.96  E-value=8.4e-10  Score=87.35  Aligned_cols=78  Identities=23%  Similarity=0.443  Sum_probs=63.8

Q ss_pred             CCHHHHHHCCCCCEEEEECCCCCCCCHHHHHHCCCCC--CCCCEEEEEECCCCEEEECCCCCCCCCCCC--CEEEEEEEE
Q ss_conf             7556530014566288887830454001111101467--886316999658731310112110056543--100001220
Q gi|254780773|r  128 ASPAAIAGVKKGDCIISLDGITVSAFEEVAPYVRENP--LHEISLVLYREHVGVLHLKVMPRLQDTVDR--FGIKRQVPS  203 (349)
Q Consensus       128 ~spA~~AGL~~GD~Il~InG~~V~s~~dl~~~i~~~~--g~~v~i~v~R~~~~~~~~~v~p~~~~~~~~--~g~~~~~~~  203 (349)
T Consensus       141 ~sPg~~AGi~~GD~I~~iNg~~i~~~~d~~~~i~~~g~~g~~l~l~i~R~~~-~i~~~~~p~~~~~e~~YrIGLyiRDsa  219 (423)
T TIGR02860       141 ESPGEEAGIQIGDIILKINGEKIKNMEDIAKLINKAGKTGEKLKLTIKRGGK-IIETKIKPVKDKEEGRYRIGLYIRDSA  219 (423)
T ss_pred             ECCHHHCCEEEEEEEEEECCCHHCCHHHHHHHHHHHHHCCCEEEEEEEECCC-EEEEEEEEEEECCCCCEEEEEEEEECC
T ss_conf             4636547845610899988811035345688887543059548999985890-899866133337887538998994166


Q ss_pred             CCC
Q ss_conf             344
Q gi|254780773|r  204 VGI  206 (349)
Q Consensus       204 igi  206 (349)
T Consensus       220 AGi  222 (423)
T TIGR02860       220 AGI  222 (423)
T ss_pred             CCC
T ss_conf             433