HHsearch alignment for GI: 254780153 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=92.87  E-value=0.73  Score=24.91  Aligned_cols=286  Identities=18%  Similarity=0.187  Sum_probs=164.2

Q ss_pred             CCCCCHHHHHHHHHHHHHHHHHHCCCCCCEEEEECCCCHHHHHHHHHHCCCCCCEEEE---EECCHHHHHHHHHHHCCCC
Q ss_conf             5328988999999999999999688998579997487348999875320578970799---7073688888765323876
Q gi|254780153|r   39 RSHRCVLGKERINKAIQLTRKVLEVPENYRIAIVPASDTGAVEMALWSLLGYRGVDVL---AWESFGLGWMSDIRQLSLQ  115 (391)
Q Consensus        39 ~sHRs~~f~~i~~~~~~~l~~l~~~p~~y~v~~l~GsgT~~~ea~~~nl~~~~~~~~~---~~g~~~~r~~~~~~~~~~~  115 (391)
T Consensus        45 YsRsGNPTRd~l~~aLA~LE---~G-~--~-AVvT~~GMsAI~L~~~~lL~pdDLlvAPHDCYGG-tYRLl~~lA~kG~~  116 (383)
T TIGR02080        45 YSRSGNPTRDILQQALAELE---GG-A--G-AVVTNSGMSAIDLVTTALLGPDDLLVAPHDCYGG-TYRLLNALAKKGQF  116 (383)
T ss_pred             CCCCCCCCHHHHHHHHHHHH---CC-C--C-CEECCCHHHHHHHHHHHEECCCCEEEECCCCCCC-HHHHHHHHHHCCCE
T ss_conf             68898975658999999984---89-9--8-2566856898876643120789768804326770-48888645207833


Q ss_pred             CEEEEECCCCCCCCHHHCC---CCCCEEEEEEECCCCEEECCEEE-----ECCCCCCEEEEEEC--CHHHHCCCCCCCCE
Q ss_conf             3067405777657867678---55657997420242022032035-----02568614886401--10110254556857
Q gi|254780153|r  116 DVREFTAPYGSLPDFSKVD---FDRDVVFVWNGTTSGVCVPDVGF-----IPESREGLVICDAT--SAVFARHIDFNKLD  185 (391)
Q Consensus       116 ~~~~~~~~~g~~~~~~~~~---~~~~v~~~h~ETstGv~~~~~~~-----~~~~~~~llivD~v--Ss~g~~p~d~~~iD  185 (391)
T Consensus       117 ~v~fVDQ~-----D~~al~~ALa~kdPKLVlIEtPSNPLlRVVDI~~lc~La~~~G~~vvVDNTFLsP~lQ~PL~-LGAD  190 (383)
T TIGR02080       117 KVQFVDQS-----DEQALEAALAQKDPKLVLIETPSNPLLRVVDIAKLCKLAKAVGAVVVVDNTFLSPILQQPLS-LGAD  190 (383)
T ss_pred             EEEEEECC-----HHHHHHHHHHHCCCCEEEEECCCCCCCHHHHHHHHHHHHHHCCEEEEEECCCCCHHHCCCCC-HHCC
T ss_conf             89986076-----28999999974698479986799885218889999988761883899855216776727530-1111


Q ss_pred             EEEECCHHCCCCCCC--CEEEEECHHHHHHHHHCCCCCCCCCHHHCCHHHHHHCCCCCCCCCCCCCHHHHHHHHHHHHHH
Q ss_conf             999700120017665--154456778887654114457783123200112321033478644666448899999999862
Q gi|254780153|r  186 VVTFSAQKVLGGEAG--FGIIILSPASVERLEKYVPSWPLPKIFRMVKGGRVMEGLFCGETINTPSLLCIEDYIDALLWL  263 (391)
Q Consensus       186 v~~a~sQK~l~~ppG--l~~v~~s~~al~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~TP~v~~i~al~~~l~~i  263 (391)
T Consensus       191 ~V~HS~TKYlNGHSDVi~GaVIaKd~q------------------~~e~L~WW~N~l-G~---tG~aFDSY~t---LRGl  245 (383)
T TIGR02080       191 LVIHSTTKYLNGHSDVIAGAVIAKDPQ------------------LAEELAWWANAL-GV---TGGAFDSYLT---LRGL  245 (383)
T ss_pred             EEHHHHHCCCCCCHHHHHHHHHCCCHH------------------HHHHHHHHHHCC-CC---CCCHHHHHHH---HHHH
T ss_conf             301111100034034312124014712------------------234433343002-55---4443468899---8678


Q ss_pred             HCCCCHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCC-------------CC-CCEEEEEECCCCCCCCCHHHHHHHH
Q ss_conf             010318999999997799999998747971676688200-------------36-5317898247310113734567888
Q gi|254780153|r  264 KKMGGLSACVERCNANAAVLFQFIQENDWIENLAVDETT-------------RS-NTSICMKIVDSDIASLDINSQKSFC  329 (391)
Q Consensus       264 ~~~gGl~~~~~r~~~~a~~l~~~i~~~~~~~~~~~~~~~-------------rS-~~~v~~~~~d~~~~~~~~~~~~~~~  329 (391)
T Consensus       246 R---TL~~Rm~~~qrnA~~Iv~yL~~~P~V~k~Y-yPgLpdH~GH~IA~~QQ~GFGAmlSFEL~G~~------~~v~~FL  315 (383)
T TIGR02080       246 R---TLAARMRSQQRNAQTIVEYLQTQPLVKKVY-YPGLPDHPGHEIAARQQKGFGAMLSFELKGGE------EAVRRFL  315 (383)
T ss_pred             H---HHHHHHHHHHHHHHHHHHHHHCCCCEEEEE-CCCCCCCCCHHHHHHHCCCCCCEEEEEECCCH------HHHHHHH
T ss_conf             8---888888888788999999984489402633-58788866769998625654330233321886------8999998


Q ss_pred             HHHHHHHHHCCEEECCCC------------CCC--------CC--CE-EEEECCCCCCHHHHHHHHHHHHHHHHH
Q ss_conf             999998886282872665------------567--------67--50-568615888999999999999999999
Q gi|254780153|r  330 KSMLSFLEKEEIAYDIGS------------YRD--------AP--LG-LRVWVGVTVEKEDLLLLCDWLRWVFYF  381 (391)
Q Consensus       330 ~~~~~~l~~~g~~~~~~~------------~r~--------~~--~~-~RIg~~g~i~~~dv~~L~~aLe~~~~~  381 (391)
T Consensus       316 ~~L~LFt----LAESLGGVESLiaHPATMTH~aM~~eAR~~AGI~~~LLRlSvG----lED~~DLiaDL~~gl~a  382 (383)
T TIGR02080       316 GKLSLFT----LAESLGGVESLIAHPATMTHAAMGPEARAEAGISDTLLRLSVG----LEDADDLIADLDQGLQA  382 (383)
T ss_pred             HHCCCHH----HHHHHCCHHHHHCHHHCCCCHHHHHHHHHHCCCCCCCCEEEEE----ECCHHHHHHHHHHHHHC
T ss_conf             4314012----1233155123333010126021018989745841142000210----03468899999999741