>TIGR01886 dipeptidase dipeptidase PepV; InterPro: IPR011291 Metalloproteases are the most diverse of the four main types of protease, with more than 50 families identified to date. In these enzymes, a divalent cation, usually zinc, activates the water molecule. The metal ion is held in place by amino acid ligands, usually three in number. The known metal ligands are His, Glu, Asp or Lys and at least one other residue is required for catalysis, which may play an electrophillic role. Of the known metalloproteases, around half contain an HEXXH motif, which has been shown in crystallographic studies to form part of the metal-binding site . The HEXXH motif is relatively common, but can be more stringently defined for metalloproteases as 'abXHEbbHbc', where 'a' is most often valine or threonine and forms part of the S1' subsite in thermolysin and neprilysin, 'b' is an uncharged residue, and 'c' a hydrophobic residue. Proline is never found in this site, possibly because it would break the helical structure adopted by this motif in metalloproteases . 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 entry represents a small clade of dipeptidase enzymes from the Lactobacillaceae, which belong to MEROPS peptidase family M20A. The Lactococcus lactis enzyme has been shown to act on a wide range of dipeptides, but not larger peptides. The enzyme from Lactobacillus delbrueckii was originally characterised as a Xaa-His dipeptidase, specifically a carnosinase (beta-Ala-His) by complementation of an Escherichia coli mutant. Further study, including the crystallisation of the enzyme , has shown it to also be a non-specific dipeptidase. This group also includes enzymes from Streptococcus and Enterococcus..

Probab=100.00 E-value=0 Score=306.92 Aligned_cols=351 Identities=23% Similarity=0.308 Sum_probs=255.2 Q ss_pred HHHHHHHHHHHCCCCCCCCHH------------HHHHHHHHHHHHCCCEEEEEEECCCCCCEEEEEEEE--ECCCC---- Q ss_conf 789999999964999789968------------999999999997798489997058887624899999--87999---- Q gi|254780782|r 3 PDCLEHLIQLIKCPSVTPQDG------------GAFFILVNTLKLLGFSIEEKDFQTKNTSIVKNLYAR--FGTEA---- 64 (389) Q Consensus 3 ~e~v~~l~~lv~ips~s~~e~------------~~~~~l~~~l~~~G~~~~~~~~~~~~~~~~~~~~~~--~g~~~---- 64 (389) T Consensus 13 Dall~DL~~LlrIdS~~D~e~At~E~PfGpGPv~al~~fL~~a~RDGfttkN~----------dNYaGh~eyg~Gdnada 82 (480) T TIGR01886 13 DALLEDLEELLRIDSSEDLENATEEAPFGPGPVDALKKFLSFAERDGFTTKNF----------DNYAGHVEYGEGDNADA 82 (480) T ss_pred HHHHHHHHHHHHHCCHHHHHHCCCCCCCCCCHHHHHHHHHHHHCCCCCEECCC----------CCCEEEEECCCCCCCCC T ss_conf 37899999997515255575067688788876899999988645689500000----------14333543477874230 Q ss_pred CEEEEECCCCCCCCCCHHHCCCCCCCEEEEC-CCCCCCCCCCCCCHHHHHHHHCCCCCCCC-CCCCCEEEEEEEECCCEE Q ss_conf 8899973368157888777256664224521-33236544333201245441000000011-357834999752022011 Q gi|254780782|r 65 PHLMFAGHIDVVPPGDFNHWTYPPFSATIAE-GKIYGRGIVDMKGSIACFIAAVARFIPKY-KNFGSISLLITGDEEGPA 142 (389) Q Consensus 65 ~~ill~~H~Dtvp~~~~~~W~~~Pf~~~~~~-g~l~GrG~~D~Kg~ia~~l~a~~~l~~~~-~~~~~i~~~~~~dEE~~~ 142 (389) T Consensus 83 ~~LGIiGHmDVVPAG--~GW~~dPf~peI~~eG~iYaRGasDDKGPs~aaYYamkilKElglp~~KKIrFvvGtnEEt-g 159 (480) T TIGR01886 83 ERLGIIGHMDVVPAG--EGWERDPFEPEIKEEGRIYARGASDDKGPSLAAYYAMKILKELGLPLSKKIRFVVGTNEET-G 159 (480) T ss_pred CCCCEEECCCEEECC--CCCCCCCCCCEECCCCCEEECCCCCCCCCCHHHHHHHHHHHHHCCCCCCEEEEEEECCCCC-C T ss_conf 104412030133278--7878864823164688687313665666128999999999980888654176786076566-7 Q ss_pred CCCCCCCCCCCCCCCCCCCEEE---------ECCCCC--------------------------CCCCC---EEEEEE--- Q ss_conf 0442111110001332120354---------145665--------------------------43431---001232--- Q gi|254780782|r 143 INGTKKMLSWIEKKGEKWDACI---------VGEPTC--------------------------NHIIG---DTIKIG--- 181 (389) Q Consensus 143 ~~G~~~l~~~~~~~~~~~d~~i---------~~ep~~--------------------------~~~~~---~~i~~g--- 181 (389) T Consensus 160 W~d~DYYf~Hee~--PlPDfgFSPDAEfPIINGEkG~~T~~l~F~g~dn~gdyvL~~FKaGlaeN~vP~~a~Avisg~sa 237 (480) T TIGR01886 160 WVDMDYYFKHEET--PLPDFGFSPDAEFPIINGEKGNVTLELSFKGDDNKGDYVLDSFKAGLAENMVPEVARAVISGASA 237 (480) T ss_pred CCCCCCCCCCCCC--CCCCCCCCCCCCCCCCCCCCCCEEEEEEEECCCCCCCEEEECCCCCCCCCCCCCCCCEEEECCCH T ss_conf 6342300023788--87883448887776212675308899986258753344760010452227898854127834574 Q ss_pred ---------------------EEEEE-----EEEEEEEEECCCCHHHHCCCCHHHHHHHHHHCCC--------------- Q ss_conf ---------------------22357-----9999996412310000001201345544320112--------------- Q gi|254780782|r 182 ---------------------RRGSL-----SGEITIHGKQGHVAYPHLTENPIRGLIPLLHQLT--------------- 220 (389) Q Consensus 182 ---------------------~rG~~-----~~~i~v~G~~~Hs~~p~~g~nAi~~~~~~i~~l~--------------- 220 (389) T Consensus 238 d~a~~l~aa~E~F~a~~a~knl~g~~E~~D~~ati~l~GkgAHga~Pq~G~N~ATfLalFLnqy~FA~ga~~Fi~~~AE~ 317 (480) T TIGR01886 238 DDAEALKAAYESFVADKAKKNLDGDLELADESATIVLIGKGAHGAAPQKGINSATFLALFLNQYAFADGAKAFIKVLAEV 317 (480) T ss_pred HHHHHHHHHHHHHHHHHHHCCCCCCEEECCCEEEEEEECCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 24899999987888887530554321431774689987355223688777508889987641030314568988865433 Q ss_pred --------CCCCCCCCCCCCCEEEEEEEEEECCCCCCCCCCCEEEEECCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCE Q ss_conf --------233445664421014667655420466655432116651343420677999999999987653242034311 Q gi|254780782|r 221 --------NIGFDTGNTTFSPTNMEITTIDVGNPSKNVIPAQVKMSFNIRFNDLWNEKTLKEEIRSRLIKGIQNVPKLSH 292 (389) Q Consensus 221 --------~~~~~~~~~~~~~~~~~i~~i~~g~~~~NvIP~~a~~~~diR~~~~~~~~~i~~~i~~~l~~~~~~~~~~~~ 292 (389) T Consensus 318 ~hEDfyG~KLG~af~DelMg~l~~nag~~~fd~~--n--~e~s~~~lNfRyPqGtspe~m~~~v~~~~g~--------~v 385 (480) T TIGR01886 318 LHEDFYGEKLGVAFEDELMGDLAMNAGVFDFDEA--N--KESSKVLLNFRYPQGTSPEEMQKKVLDKVGE--------VV 385 (480) T ss_pred HCCCCCCCEEEEEEEECCCCCCCCCCCCCCCCCC--C--CCCCEEEEECCCCCCCCHHHHHHHHHHHCCC--------EE T ss_conf 1013056320036541242121157750243356--8--7665765421588888889999999974397--------89 Q ss_pred EEEECC-CCCCCCCCCHHHHHHHHHHHHHHHHCCCCEEEECCCCCHHHHHHHCCCEEEEEEC----CCCCCCCCCEEEHH Q ss_conf 232226-6311257867899999999999982899579741454358898605989999004----78736878404799 Q gi|254780782|r 293 TVHFSS-PVSPVFLTHDRKLTSLLSKSIYNTTGNIPLLSTSGGTSDARFIKDYCPVIEFGLV----GRTMHALNENASLQ 367 (389) Q Consensus 293 ~i~~~~-~~~p~~~~~~~~l~~~l~~a~~~~~g~~~~~~~~gg~~d~~~~~~~iP~v~fGp~----~~~~H~pdE~i~i~ 367 (389) T Consensus 386 ~vt~~~~~~ePHYVP~sDPlV~TLl~VYEk~TG~kG~E~iIGGGTyGRLleRGV---AyGA~feg~pd~MH~ANEf~~ld 462 (480) T TIGR01886 386 DVTLNDRLEEPHYVPVSDPLVATLLKVYEKHTGKKGYEVIIGGGTYGRLLERGV---AYGAMFEGEPDVMHQANEFMELD 462 (480) T ss_pred EEEECCCCCCCCEECCCCHHHHHHHHHHHHHCCCCCCEEEECCCCHHHHHHHCC---EECCCCCCCCCHHHHHHCCCHHH T ss_conf 997668348895335886388889999875078986148974752012432031---11267832686045432141078 Q ss_pred HHHHHHHHHHHHHHHH Q ss_conf 9999999999999987 Q gi|254780782|r 368 DLEDLTCIYENFLQNW 383 (389) Q Consensus 368 ~l~~~~~~~~~~i~~~ 383 (389) T Consensus 463 dl~~a~aIYAeAIYeL 478 (480) T TIGR01886 463 DLYKAAAIYAEAIYEL 478 (480) T ss_pred HHHHHHHHHHHHHHHH T ss_conf 9999999999999851

HHsearch alignment for GI: 254780782 and conserved domain: TIGR01886