>TIGR01250 pro_imino_pep_2 proline-specific peptidases; InterPro: IPR005945 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. This group of serine peptidase belong to MEROPS peptidase family S33 (clan SC). They are proline iminopeptidase (Prolyl aminopeptidase, 3.4.11.5 from EC), which catalyzes the removal of the N-terminal proline from peptides. This family represents one of two related families of proline iminopeptidase containing the alpha/beta fold. The fine specificities of the various members, including both the range of short peptides from which proline can be removed and whether other amino acids such as alanine can be also removed, may vary among members. One of the members of this family is the tricorn protease (TRI) interacting factor 1 from Thermoplasma acidophilum. Factor 1 (F1) is a 33.5 kDa serine peptidase of the alpha/beta-hydrolase family. Tricorn generates small peptides, which are cleaved by F1 to yield single amino acids , . ; GO: 0016804 prolyl aminopeptidase activity, 0005737 cytoplasm.

Probab=100.00  E-value=1.5e-37  Score=242.26  Aligned_cols=248  Identities=19%  Similarity=0.257  Sum_probs=184.0

Q ss_pred             EEEEECCCCEEEEEEECCCC-CCEEEEECCCCCCCHHHHHHHHHHHHHHH-CCCEEEEECCCCCCCCCCCCCC------C
Q ss_conf             79993499499999964899-87899998788880012217999999986-8989999647655422222222------2
Q gi|254780166|r    6 KFFRSWRKYQFAFYDVGDKD-APTILLIHGLASSVQTNWLFSGWIQLLCD-QGFRVIAFDNLGHGKSDKSYIE------N   77 (261)
Q Consensus         6 ~~~~~~dG~~l~y~~~g~~~-~~~vv~iHG~~~~~~~~~~~~~~~~~l~~-~g~~vi~~D~~G~G~S~~~~~~------~   77 (261)
T Consensus         4 e~~~~~~Gg~~~~~~~~~~g~~~~Ll~lHGGPG~~H~--Yl~~l~~~~~~~~G~~V~~YDQLGcg~Sd~Pd~s~PE~~~k   81 (302)
T TIGR01250         4 EGIITVDGGYVLFTKTGGEGEKIKLLVLHGGPGSSHE--YLENLKELLKEDLGREVIMYDQLGCGYSDQPDDSDPEIAEK   81 (302)
T ss_pred             CEEEEECCCEEEEEEECCCCCCCEEEEEECCCCCCHH--HHHHHHHHHHHCCCCEEEEEECCCCCCCCCCCCCCCHHHHH
T ss_conf             2057206868999873178989218997088988742--37999999764078279998324577778588877312345


Q ss_pred             CCCCCCCCCCCCCCCCCCCCCC--CCCCCCCCCCCCHHHHHHHC-CCCCCCEEEECCCCCCCCCCHHHHHHHH-HHHHCC
Q ss_conf             2221222222222222222222--22234434443101333210-2356523896288563311035699999-986311
Q gi|254780166|r   78 DYRLVFMAADAVSLLEHLGISK--VHVMGYSMGARIACSMVLFY-PSYVRSVILGGVGSVLYDSDVVDWQSLI-DSFLLP  153 (261)
Q Consensus        78 ~~s~~~~~~di~~~i~~l~~~~--~~liGhS~Gg~ia~~~a~~~-p~~v~~lvl~~~~~~~~~~~~~~~~~~~-~~~~~~  153 (261)
T Consensus        82 l~t~d~fV~E~e~vR~~L~l~~~nfyllG~SWGG~LA~~Yal~Yh~~~lkglI~ss~~~s~pey~~~-~~r~~~~~Lp~~  160 (302)
T TIGR01250        82 LWTIDYFVDELEEVREKLGLDKKNFYLLGHSWGGLLAQEYALKYHGQHLKGLIISSMLDSAPEYVKE-LNRLRDKKLPPE  160 (302)
T ss_pred             HHHHHHHHHHHHHHHHHHCCCCCCEEEEECCHHHHHHHHHHHHHCCCCCEEEEEECCCCCHHHHHHH-HHHHHHHCCCHH
T ss_conf             4200023899999999855786527897026789999999997378982699985565672478999-998776328998


Q ss_pred             CCCHHHHHHH------HH----HCCCC----------------CCCCCCC-HHHHHH--------HHH--HHCCCCCHHH
Q ss_conf             1100001110------00----00000----------------3476654-135677--------765--4101220012
Q gi|254780166|r  154 SIDEVQNPLG------KK----FRKFA----------------DLDPGND-LKALAS--------CLS--MIRKPFCQDD  196 (261)
Q Consensus       154 ~~~~~~~~~~------~~----~~~~~----------------~~~~~~~-~~~~~~--------~~~--~~~~~~~~~~  196 (261)
T Consensus       161 ~~~~i~~~E~~g~~~~~~Y~~~v~~~~~~~~~~~~~~~P~~l~~~~~~~~n~~vY~~m~GpnEF~~~Gda~L~dWD~~D~  240 (302)
T TIGR01250       161 VREAIKRCEASGDYDDPEYQEAVEVFYYQHLICRLRKWPEALKRLKSGMRNTEVYNIMQGPNEFTITGDANLKDWDITDK  240 (302)
T ss_pred             HHHHHHHHHCCCCCCCHHHHHHHHHHCCCEEEECCCCCHHHHHHHHHCCCHHHHHHHHCCCCCCEEECCCEEEECCHHCC
T ss_conf             99999997426898898999999862201242046775478999873155036677442895653513643430201031


Q ss_pred             HHCCCCCEEEEEECCCCCCCC-HHHHHHHCCCCEEEEECCCCCCCCCCCH-HHHHHHHHHHH
Q ss_conf             100357606998478887880-7999996799799998888738434848-99999999987
Q gi|254780166|r  197 LYRIDVPVLIAVGSQDDLAGS-PQELMSFIPSSQYLNICRRDHLLAVGDK-QFKQGVVNFYA  256 (261)
Q Consensus       197 l~~i~~P~l~i~G~~D~~~~~-~~~l~~~~p~~~~~~i~~~gH~~~~e~p-~~~~~i~~Fl~  256 (261)
T Consensus       241 L~~I~vPTLlt~G~~D~~~p~~~~~m~~~i~~Srl~~f~~g~H~~m~e~~~~y~~~l~~Fl~  302 (302)
T TIGR01250       241 LSEIKVPTLLTVGEFDTMTPEAAREMQELIAKSRLVVFPDGSHMTMIEEPEVYFKLLSDFLR  302 (302)
T ss_pred             HHHCCCCCEEEEECCCCCCHHHHHHHHHHCCCCEEEECCCCCCCCCCCCHHHHHHHHHHHHC
T ss_conf             54358760033420465788999999876078738984788513753483889999998709