>TIGR00054 TIGR00054 membrane-associated zinc metalloprotease, putative; InterPro: IPR004387 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 family contains putative zinc metallopeptidases belonging to MEROPS peptidase family M50 (S2P protease family, clan MM). The N-terminal region of contains a perfectly conserved motif HEXGH, where the Glu is the active site and the His residues coordinate the metal cation. The family of bacterial and plant proteins also includes a region that hits the PDZ domain (IPR001478 from INTERPRO), found in a number of proteins targeted to the membrane by binding to a peptide ligand . The family includes EcfE, which is a homolog of human site-2 protease (S2P), a membrane-bound zinc metalloprotease involved in regulated intramembrane proteolysis. In Escherichia coli EcfE activates the sigma(E) pathway of stress response through a site-2 cleavage of anti-sigma(E), RseA.; GO: 0004222 metalloendopeptidase activity, 0006508 proteolysis, 0016021 integral to membrane.

Probab=100.00 E-value=0 Score=661.09 Aligned_cols=341 Identities=34% Similarity=0.630 Sum_probs=311.6 Q ss_pred CHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCEEEEEEEECCCHHEEEEECCCEEEEEEEEEECCEEECCC---CC-- Q ss_conf 9368999999999999999973377999998497500455306831127860598079999771121110012---44-- Q gi|254780773|r 1 MFWLDCFLLYTVSLIIIVVIHEFGHYMVARLCNIRVLSFSVGFGPELIGITSRSGVRWKVSLIPLGGYVSFSE---DE-- 75 (349) Q Consensus 1 m~~~~~~~~~~~~l~~~v~iHE~GH~~~Ar~~gv~V~~FsiGfgp~l~~~~~k~~t~y~i~~~PlGgyV~~~~---~e-- 75 (349) T Consensus 1 ~~~l~~l~sFi~~La~Li~vHElGHF~~Ar~~GvkV~~FsiGFGp~lW~~~~~~~TeY~is~IPLGGYVk~~Gfd~lD~e 80 (463) T TIGR00054 1 MSFLWILASFIIALAVLIFVHELGHFLAARLCGVKVERFSIGFGPKLWLKFKKNGTEYAISLIPLGGYVKMKGFDGLDKE 80 (463) T ss_pred CHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCEEEEEEECCCCHHHHHCCCCCCEEEEEEECCCCEEECCCCCCCCCC T ss_conf 93788899999999999999988899999877946999742027056520013674589875326543623788997664 Q ss_pred --------CCHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHCC-CCCCCCC------------------------------ Q ss_conf --------5506650368421013421123332112211101-1100123------------------------------ Q gi|254780773|r 76 --------KDMRSFFCAAPWKKILTVLAGPLANCVMAILFFT-FFFYNTG------------------------------ 116 (349) Q Consensus 76 --------~~~~~f~~~~~~~R~~i~~AGp~~N~ilA~iif~-~~~~~~g------------------------------ 116 (349) T Consensus 81 ~~~~~~~e~~~~~f~~~s~~~k~~i~~aG~~~N~iFa~~~~~~~~~~-~G~~~~~~~~vi~~~~~~S~a~~a~~~~Gd~i 159 (463) T TIGR00054 81 EEEVKPPETDKDLFNNKSVLQKAIIIFAGPLANFIFAIFVYIDLVSL-IGVPGYEVGPVIEELDKNSIALEAGIEPGDEI 159 (463) T ss_pred CCCCCCCCCCHHHHHCCCHHHEEHEECCCHHHHHHHHHHHHHHHHHH-HCCCCCCCCCCCCCCCHHHHHHHHCCCCCCEE T ss_conf 10367652101365268712310100144143599999999989998-04244213664565544579987116898478 Q ss_pred ----------------------------------------------------------------------CCCCCCCCCC Q ss_conf ----------------------------------------------------------------------3332000245 Q gi|254780773|r 117 ----------------------------------------------------------------------VMKPVVSNVS 126 (349) Q Consensus 117 ----------------------------------------------------------------------~~~p~I~~V~ 126 (349) T Consensus 160 l~~~~~~~~~f~~~~~~~~~~~~g~~~~~I~~~PF~S~~e~~~~L~L~~~~~~~~~~~~~~~lgl~~~~P~ie~vl~~~~ 239 (463) T TIGR00054 160 LSVNGKKIPGFKDVRKQIADIVAGEPMVEILAAPFNSDIEREVKLDLRNWTFEVEKEDAVEQLGLKPRGPKIEPVLSDVT 239 (463) T ss_pred EEECCCCCCCCHHHHHHHHHHHCCCCCCEEEECCCCCCCHHHCCCCCEEEEEECCCCCHHHHCCCCCCCCCCEEEECCCC T ss_conf 74077667880889999999751785415776577754112000033123862112552554144247872012331267 Q ss_pred CCCHHHHHHCCCCCEEEEECCCCCCCCHHHHHHCCCCCCCCCEEEEEECCCCEEEECCCCCCCCCCCCCEEEEEEEECCC Q ss_conf 67556530014566288887830454001111101467886316999658731310112110056543100001220344 Q gi|254780773|r 127 PASPAAIAGVKKGDCIISLDGITVSAFEEVAPYVRENPLHEISLVLYREHVGVLHLKVMPRLQDTVDRFGIKRQVPSVGI 206 (349) Q Consensus 127 ~~spA~~AGL~~GD~Il~InG~~V~s~~dl~~~i~~~~g~~v~i~v~R~~~~~~~~~v~p~~~~~~~~~g~~~~~~~igi 206 (349) T Consensus 240 ~N~~A~~AGLk~GD~I~~i~g~~l~~w~d~v~~v~~np~~~~~i~v~R~G-~~l~~~l~p~~~~~~gK-----aIg~ig~ 313 (463) T TIGR00054 240 PNSPAEKAGLKEGDKIISIDGEKLKSWRDFVSLVKENPGKSLEIKVERNG-ETLSISLTPEAKKDKGK-----AIGFIGI 313 (463) T ss_pred CCCHHHHCCCCCCCEEEEECCCCCCCHHHHHHHHHHCCCCEEEEEEEECC-CEEEEEEEEEEECCCCC-----EEEEEEE T ss_conf 88537753465688898556812344245899998689956999997278-14634787530079973-----6898775 Q ss_pred CCCCCCCC-----CCCCCHHHHHHHHHHHHHHHHHHHEECCCCCCCCCCCCCCCCCCCHHHHHHHHHHHCCHHHHHHHHH Q ss_conf 44321233-----3456688876898886554223100000002554200224667301223334565305034789999 Q gi|254780773|r 207 SFSYDETK-----LHSRTVLQSFSRGLDEISSITRGFLGVLSSAFGKDTRLNQISGPVGIARIAKNFFDHGFNAYIAFLA 281 (349) Q Consensus 207 ~~~~~~~~-----~~~~~~~~a~~~~~~~~~~~~~~~~~~l~~l~~g~~~~~~lsGPVgIa~~~~~~a~~G~~~~l~~~a 281 (349) T Consensus 314 ~P~~~~~~d~~~~v~~~~~l~a~~~~~~~~~~~~~li~~~l~~Li~g~~~l~~lSGPVgIv~~~~~~A~~G~~~ll~F~A 393 (463) T TIGR00054 314 SPSLKKLEDEYKVVVSYGILEALAKAAEATKDIVKLILKLLGKLITGSLKLKNLSGPVGIVKGAGSSANLGIVYLLQFGA 393 (463) T ss_pred CCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCHHHCCCCCHHHHHHHHHHHHHHHHHHHHHH T ss_conf 68753031132100244267899999999989999999988875400022200567421545512466764999998999 Q ss_pred HHHHHHHHHHHHC--CCCCCHHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf 9999999996306--472243699999998882786999999999999999999999999999988873 Q gi|254780773|r 282 MFSWAIGFMNLLP--IPILDGGHLITFLLEMIRGKSLGVSVTRVITRMGLCIILFLFFLGIRNDIYGLM 348 (349) Q Consensus 282 ~isi~Lg~~NlLP--ip~LDGG~i~~~~~E~i~gr~i~~~~~~~~~~~g~~ll~~l~i~~~~nDi~rl~ 348 (349) T Consensus 394 llSiNLgi~NLlPiviP~LDGG~llfl~iE~i~Gkp~~~~~q~~~~~~G~~lLl~L~~l~lfND~~rLl 462 (463) T TIGR00054 394 LLSINLGIINLLPIVIPALDGGQLLFLFIEAIRGKPLPEKVQAFVYRIGVALLLLLMVLGLFNDLLRLL 462 (463) T ss_pred HHHHHHHHHHHHHHHHHHHCCHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHC T ss_conf 999999999888778624242578788998735897766899999999999999999999988876511

HHsearch alignment for GI: 254780773 and conserved domain: TIGR00054