HHsearch alignment for GI: 254781062 and conserved domain: TIGR02080

>TIGR02080 O_succ_thio_ly O-succinylhomoserine (thiol)-lyase; InterPro: IPR011821 Proteins in this entry are important in the interconversion of the sulphur-containing amino acids L-cysteine and L-methionine in bacteria. In bacteria, inorganic sulphur is reduced to sulphide, which is then used to displace the acetyl group of O-acetyl-L-serine to form the essential amino acid L-cysteine. Biosynthesis of L-methionine then occurs via the transsulphuration pathway which involves the sequential action of two pyridoxal 5'-phosphate (PLP) enzymes, cystathionine gamma-synthase (CGS) and cystathionine beta-lyase (CBL). Firstly CGS catalyses the formation of the intermediate cystathione from a homoserine ester and L-cysteine. This intermediate is then converted by CBL to L-homoserine, which is subsequently methylated by methionine synthase to form L-methionine. For more information see . The CGS enzyme (P00935 from SWISSPROT) from Escherichia coli is, like other CGS enzymes, a homotetramer composed of two catalytically active dimers . The active site of each dimer is found at the interface between the monomers and involves residues from each monomer. Catalysis occurs by alpha,gamma-elimination/replacement reactions..
Probab=99.75  E-value=1.8e-18  Score=136.00  Aligned_cols=295  Identities=19%  Similarity=0.228  Sum_probs=187.9

Q ss_pred             HHHHHHCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCH
Q ss_conf             99999828797654334687689876543223444320134434540110000100001222232222222222222102
Q gi|254781062|r   74 DKVRRFINASSVKEIIFTRSATESINLVSYGWGARHISTGDEIVLSVMEHHSNIIPWYFLRQRRGASLVWVPIDNQGFFH  153 (406)
Q Consensus        74 ~~ia~~lga~~~~~v~ft~~~Te~~n~~~~~~~~~~~~~gd~Vi~s~~eh~s~~~~~~~~~~~~G~~v~~i~~~~~g~id  153 (406)
T Consensus        58 ~aLA~LE~G~~A---VvT~~GMsAI~L~~~~l----L~pdDLlvAPHDCYGGtYRLl~~lA~kG~~~v~fVD--Q~---D  125 (383)
T TIGR02080        58 QALAELEGGAGA---VVTNSGMSAIDLVTTAL----LGPDDLLVAPHDCYGGTYRLLNALAKKGQFKVQFVD--QS---D  125 (383)
T ss_pred             HHHHHHHCCCCC---EECCCHHHHHHHHHHHE----ECCCCEEEECCCCCCCHHHHHHHHHHCCCEEEEEEE--CC---H
T ss_conf             999998489982---56685689887664312----078976880432677048888645207833899860--76---2


Q ss_pred             HHHHHHHCCCC-CCCCCCCCCCCCCCCCCCCCCEECCCCCCCCCCCCCCCCCCCC--CCCCHHHHCCCCCCCCCCCCCCC
Q ss_conf             57887510233-4433222222223333333210002344443101233200011--10000110011222343222354
Q gi|254781062|r  154 IDEFKNRLTER-TKLIAITHMSNVLGTVIPIKEICRIAHERNIPVLVDGSQGSVH--NFVDVQDIDCDWYIITGHKLYGP  230 (406)
Q Consensus       154 ~~~l~~~i~~~-t~lv~i~~~~~~tG~~~pi~~I~~~~~~~g~~~~vD~aq~~g~--~~id~~~~~~D~~~~S~hK~~Gp  230 (406)
T Consensus       126 ~~al~~ALa~kdPKLVlIEtPSNPLlRVVDI~~lc~La~~~G~~vvVDNTFLsP~lQ~PL---~LGAD~V~HS~TKYlNG  202 (383)
T TIGR02080       126 EQALEAALAQKDPKLVLIETPSNPLLRVVDIAKLCKLAKAVGAVVVVDNTFLSPILQQPL---SLGADLVIHSTTKYLNG  202 (383)
T ss_pred             HHHHHHHHHHCCCCEEEEECCCCCCCHHHHHHHHHHHHHHCCEEEEEECCCCCHHHCCCC---CHHCCEEHHHHHCCCCC
T ss_conf             899999997469847998679988521888999998876188389985521677672753---01111301111100034


Q ss_pred             CC---CCHHHCCCCCCCCCEEECCCCEEEEEEECCCCCCCCCHHCCCCCCCCCHHHHHHHH-HCCCC-CCCCCCCCCCCC
Q ss_conf             44---31000256663100121145303433202453003310000012212024566421-01233-222222222222
Q gi|254781062|r  231 SG---IGGLYSKESRLNEMDPFMGGSEMIADVTQDMVTYADLPYRFEPGTPPISQAIALGV-ALDYV-EKIDRKSIFSYE  305 (406)
Q Consensus       231 ~G---~G~l~~~~~~~~~~~p~~~g~~~~~~~~~~~~~~~~~~~r~e~Gt~~~~~~~al~~-al~~~-~~~g~~~i~~~~  305 (406)
T Consensus       203 HSDVi~GaVIaKd~q~~---e~L~WW~N~lG~tG~aFDS-------------Y~tLRGlRTL~~Rm~~~qrnA~~Iv~yL  266 (383)
T TIGR02080       203 HSDVIAGAVIAKDPQLA---EELAWWANALGVTGGAFDS-------------YLTLRGLRTLAARMRSQQRNAQTIVEYL  266 (383)
T ss_pred             CHHHHHHHHHCCCHHHH---HHHHHHHHCCCCCCCHHHH-------------HHHHHHHHHHHHHHHHHHHHHHHHHHHH
T ss_conf             03431212401471223---4433343002554443468-------------8998678888888888878899999998


Q ss_pred             C---CCCCCCCCCCCCCCEEEECCCCCC-CCCEEEEEECCCCHHHHHHHHHHCCCEE---EEC------CHHHHHHHHHC
Q ss_conf             2---222222222222210132268521-5867999808999999999998789699---975------21127889972
Q gi|254781062|r  306 R---ELARYVRSRLKEVRGMQLVNESLE-DSPIISFRLGNIHPYDLALFLDGEGIAI---RAG------THCANPLLKFL  372 (406)
Q Consensus       306 ~---~l~~~l~~~L~~~~g~~i~~~~~~-~~~iv~~~~~~~~~~~v~~~L~~~gI~v---~~G------~~ca~~~~~~~  372 (406)
T Consensus       267 ~~~P~V~k~YyPgLpdH~GH~IA~~QQ~GFGAmlSFEL~G~-~~~v~~FL~~L~LFtLAESLGGVESLiaHPATMTH~aM  345 (383)
T TIGR02080       267 QTQPLVKKVYYPGLPDHPGHEIAARQQKGFGAMLSFELKGG-EEAVRRFLGKLSLFTLAESLGGVESLIAHPATMTHAAM  345 (383)
T ss_pred             HCCCCEEEEECCCCCCCCCHHHHHHHCCCCCCEEEEEECCC-HHHHHHHHHHCCCHHHHHHHCCHHHHHCHHHCCCCHHH
T ss_conf             44894026335878886676999862565433023332188-68999998431401212331551233330101260210


Q ss_pred             CC---------CCEEEEEECCCCCHHHHHHHHHHHHHHHHH
Q ss_conf             89---------957999935888999999999999999997
Q gi|254781062|r  373 GI---------DSLCRASLAMYNTYEEADKFIETLKKSIQF  404 (406)
Q Consensus       373 g~---------~~~iRiS~~~~nt~edid~~i~~l~~~i~~  404 (406)
T Consensus       346 ~~eAR~~AGI~~~LLRlSvGl----ED~~DLiaDL~~gl~a  382 (383)
T TIGR02080       346 GPEARAEAGISDTLLRLSVGL----EDADDLIADLDQGLQA  382 (383)
T ss_pred             HHHHHHHCCCCCCCCEEEEEE----CCHHHHHHHHHHHHHC
T ss_conf             189897458411420002100----3468899999999741